CN108963188B - Lithium battery cathode, preparation method thereof and lithium battery - Google Patents
Lithium battery cathode, preparation method thereof and lithium battery Download PDFInfo
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- CN108963188B CN108963188B CN201811082163.3A CN201811082163A CN108963188B CN 108963188 B CN108963188 B CN 108963188B CN 201811082163 A CN201811082163 A CN 201811082163A CN 108963188 B CN108963188 B CN 108963188B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a lithium battery cathode, a preparation method thereof and a lithium battery, wherein the lithium battery cathode comprises a current collector, an adhesive layer, a carbon nano tube film, an intermediate layer and a lithium guide layer, wherein the adhesive layer is coated on the current collector and is of a net structure formed by coating an adhesive in a shape of a Chinese character 'jing', the carbon nano tube film is bonded on the current collector through the adhesive layer, the intermediate layer is arranged on the carbon nano tube film, the lithium guide layer is arranged on the intermediate layer, and the intermediate layer is a graphene film. The invention can prevent a large amount of adhesive from mixing into the carbon nanotube film while ensuring the close fit of the carbon nanotube film, the current collector and the graphene film, fully utilizes the surface microporous structure of the carbon nanotube film and the graphene film, improves the charge-discharge rate of the lithium battery, and simultaneously improves the liquid absorption and retention capacity of the negative electrode by the microporous structure and the large specific surface area of the carbon nanotube film, thereby improving the charge-discharge performance and the cycle performance of the lithium battery.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery cathode, a preparation method thereof and a lithium battery.
Background
The lithium battery is a green clean energy, has the advantages of high voltage, high energy density and the like compared with the traditional nickel-chromium battery, nickel-hydrogen battery and the like, is rapidly accepted by people by virtue of the advantages and is rapidly developed in many neighborhoods since the advent, and is widely applied to rapidly developed portable equipment.
The conventional lithium battery mainly comprises four parts, namely an anode, a cathode, a diaphragm and an electrolyte, wherein a common anode material of the lithium ion battery is an active compound containing lithium, a cathode material is firstly made of a carbon material, the active compound of the anode can release lithium ions by the potential applied to two poles of the battery during charging, the lithium ions are embedded into carbon with a sheet-shaped structure formed by cathode molecules, and during discharging, the lithium ions are separated out from the carbon again and are combined with the compound of the anode again, so that the effect of cyclic charging and discharging is achieved, in the first charging and discharging process of the lithium battery, the electrode material and an electrolyte can react on a solid-liquid phase interface to form a layer of SEI film, the SEI film can isolate electrons and is an excellent conductor of the lithium ions, the generation of the SEI film can consume part of the lithium ions, so that the first charging and discharging irreversible capacity is increased, the charging and discharging efficiency of the motor material is reduced, but the SEI film can avoid damage to the, therefore, the invention provides the following technical scheme for solving the problem that the relation between the charge and discharge efficiency of the lithium ion battery and the cycle performance and the service life of the battery is improved.
Disclosure of Invention
The invention aims to provide a lithium battery cathode, a preparation method thereof and a lithium battery.
The technical problems to be solved by the invention are as follows:
1. in the prior art, the speed and the embedding amount of lithium ions in a lithium ion battery are limited by the structure of a negative electrode material, so that the speed and the embedding amount cannot be obviously improved, and the charge-discharge efficiency of the lithium ion battery is directly influenced;
2. in the prior art, a conductive agent, an active substance and a binder are directly mixed and then are uniformly coated on a metal current collector after pulping, on one hand, the binder can affect the negative active substance, the surface microporous structure of the negative active substance cannot be fully utilized, and the adsorption of the negative active substance to lithium ions is limited;
3. the negative electrode of the lithium battery has poor liquid absorption and retention capabilities, so that the charge and discharge performance and the cycle performance of the lithium battery are directly influenced.
The purpose of the invention can be realized by the following technical scheme:
a lithium battery cathode comprises a current collector, an adhesive layer, a carbon nanotube film, an intermediate layer and a lithium conducting layer, wherein the adhesive layer is coated on the current collector and is of a net structure formed by coating an adhesive in a shape like a Chinese character 'jing', the carbon nanotube film is bonded on the current collector through the adhesive layer, the intermediate layer is arranged on the carbon nanotube film, and the lithium conducting layer is arranged on the intermediate layer;
the current collector is a metal substrate, and the material of the current collector can be one of copper, gold or silver;
the middle layer is a graphene film;
the lithium conducting layer is formed by conducting lithium spraying solution in an electrostatic spraying mode, wherein the lithium conducting spraying solution is prepared from a lithium ion conductor material capable of insulating electrons;
the adhesive is a mixture of sodium carboxymethylcellulose and styrene butadiene rubber latex, wherein the sodium carboxymethylcellulose accounts for 45-55% of the weight of the adhesive, and the styrene butadiene rubber latex accounts for 45-55% of the weight of the adhesive;
the carbon nanotube film contains a large number of micropore structures, and the pore diameter of each micropore is smaller than 1 micron, so that the carbon nanotube film has a large specific surface area.
A preparation method of a lithium battery negative electrode comprises the following steps:
the method comprises the following steps: coating the prepared adhesive on a current collector, wherein the coating method of the adhesive comprises the following steps: coating a plurality of parallel adhesive strips A on a current collector at equal intervals, wherein the distance between two adjacent adhesive strips A is 1/2L-d; coating a plurality of parallel adhesive strips B on a current collector at equal intervals, wherein the distance between every two adjacent adhesive strips B is H-d, the adhesive strips B are perpendicular to the adhesive strips A, the coating width of the adhesive strips B is equal to that of the adhesive strips A, the humidity of the coating environment of the adhesive is kept between 60% and 75%, and the rapid drying of an adhesive machine in the adhesive coating process is prevented, wherein L is the distance between two points which are farthest away on a produced negative electrode along the direction of the adhesive strips B, d is the coating width of the adhesive strips A, and H is the distance between two points which are farthest away on the produced negative electrode along the direction of the adhesive strips A;
step two: uniformly laying a carbon nanotube film on a current collector, and rolling the carbon nanotube film by using a rolling shaft-shaped pressure head to tightly bond the carbon nanotube film and the current collector together, wherein the rolling method of the rolling shaft-shaped pressure head is to roll along an adhesive strip A or an adhesive strip B, and the rolling direction of the rolling shaft-shaped pressure head is unchanged in the whole rolling process, so that the adhesive diffused by extrusion is uniformly dispersed;
step three: coating an adhesive strip C and an adhesive strip D on the carbon nano tube film according to the coating method in the step one, wherein the coating position and the coating width of the adhesive strip C are the same as those of the adhesive strip A, and the coating position and the coating width of the adhesive strip D are the same as those of the adhesive strip B;
step four: uniformly laying the graphene film on the carbon nanotube film, and rolling the graphene film by using a rolling shaft-shaped pressure head to tightly adhere the carbon nanotube film and the graphene film together, wherein the part, which is not connected by the adhesive, between the carbon nanotube film and the graphene film is tightly adhered together according to van der waals force, and the rolling direction of the rolling shaft-shaped pressure head in the step II is consistent with that in the step II;
step five: filling the prepared lithium-conducting spraying solution into an injector, spraying in a high-voltage electric field of 25KV, wherein the spraying environment temperature is 23-27 ℃, the environment humidity is less than 30%, and after spray drying, forming a lithium-conducting layer, wherein the thickness of the lithium-conducting layer is preferably 5-55 nm;
step six: drying for 8-10h at 45-55 ℃, rolling by a roller-shaped pressure head, and cutting to form the finished product cathode after rolling.
According to the invention, the negative plate is designed into the carbon nanotube film, the graphene film and the lithium conducting layer from inside to outside, wherein two sides of the carbon nanotube film are respectively connected with the current collector and the graphene film through the adhesive layers, and due to the net laying mode of the adhesive layers, the adhesive can be prevented from being mixed into the carbon nanotube film in a large amount while the carbon nanotube film is tightly attached to the current collector and the graphene film, the surface microporous structures of the carbon nanotube film and the graphene film can be fully utilized, the speed and the embedding amount of lithium ions in a negative electrode material are increased, so that the charge and discharge rate of the lithium ion battery is increased, and meanwhile, the liquid absorption and retention capacity of the negative electrode are increased due to the microporous structure and the large specific surface area of the carbon nanotube film, so that the charge and discharge performance and the cycle performance of the lithium ion battery are.
The lithium-guiding spray solution is formed by uniformly stirring and dispersing inorganic lithium salt and an organic solvent, wherein the inorganic lithium salt is one of lithium sulfate, lithium phosphate, lithium dihydrogen phosphate, lithium carbonate, lithium silicate, lithium borate, lithium metaborate, lithium aluminate and lithium metaaluminate, and the organic solvent is one of methanol, ethanol and isopropanol or a mixed solvent of at least two of the methanol, the ethanol and the isopropanol;
the inorganic lithium salt is a lithium ion conductor material capable of insulating electrons, and the lithium conducting layer formed by the inorganic lithium salt can inhibit the electrolyte from contacting the intermediate layer and the carbon nanotube film, so that the reduction resistance of the electrolyte is improved, the lithium ion consumption during repair and formation of an SEI film is reduced, and the cycle performance of the lithium ion battery is improved.
The invention also comprises a lithium battery, and the preparation method of the lithium battery comprises the following steps:
s1, preparing a positive plate, namely uniformly dispersing and mixing substances such as a positive active substance, a conductive agent, a binder, a solvent and the like to prepare positive slurry, uniformly coating the positive slurry on the surface of a positive current collector, and drying, rolling, cutting and vacuum drying to form the positive plate of the lithium battery;
s2, adopting the lithium battery negative plate prepared in the step;
and S3, stacking or winding the positive and negative pole pieces to form a battery core, and then putting the battery core into a battery shell, wherein the material of the battery shell has no specific requirement in the invention, and the battery shell can be an aluminum shell, a steel shell, a plastic shell or an aluminum-plastic film, and after being sealed, the battery shell is subjected to liquid injection, formation and other operations to obtain the finished lithium battery.
The invention has the beneficial effects that:
1. the two sides of the carbon nanotube film are respectively connected with the current collector and the graphene film through the adhesive layers, and due to the net laying mode of the adhesive layers, the carbon nanotube film, the current collector and the graphene film are tightly attached, meanwhile, a large amount of adhesive can be prevented from being mixed into the carbon nanotube film, the surface microporous structures of the carbon nanotube film and the graphene film can be fully utilized, the speed and the embedding amount of lithium ions embedded into a negative electrode material are improved, and the charging and discharging speed of the lithium ion battery is improved;
2. meanwhile, the microporous structure and the large specific surface area of the carbon nanotube film improve the liquid absorption and retention capacity of the negative electrode, so that the charge and discharge performance and the cycle performance of the lithium ion battery are improved;
3. the lithium ion battery has the advantages that the lithium conducting layer is arranged on the surface, back to the carbon nanotube film, of the graphene film, lithium ion exchange between lithium ions and the negative electrode is not affected due to the lithium conducting layer, contact between electrolyte and a negative electrode material can be inhibited, consumption of the lithium ions in the lithium ion battery in the using process is reduced, and cycle performance of the lithium ion battery is improved.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 is a schematic structural view of a lithium ion negative electrode;
fig. 2 is a schematic structural view of the adhesive layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A lithium battery cathode comprises a current collector, an adhesive layer, a carbon nanotube film, an intermediate layer and a lithium guide layer, wherein the adhesive layer is coated on the current collector and is of a net structure formed by coating an adhesive in a shape like a Chinese character 'jing', the carbon nanotube film is bonded on the current collector through the adhesive layer, the intermediate layer is arranged on the carbon nanotube film, and the lithium guide layer is arranged on the intermediate layer;
the current collector is a metal substrate and is made of copper;
the middle layer is a graphene film;
the lithium conducting layer is formed by conducting lithium spraying solution in an electrostatic spraying mode, wherein the lithium conducting spraying solution is prepared from a lithium ion conductor material capable of insulating electrons;
the adhesive is a mixture of sodium carboxymethylcellulose and styrene butadiene rubber latex, wherein the sodium carboxymethylcellulose accounts for 55% of the weight of the adhesive, and the styrene butadiene rubber latex accounts for 45% of the weight of the adhesive;
the carbon nanotube film contains a large number of micropore structures, and the pore diameter of each micropore is smaller than 1 micron, so that the carbon nanotube film has a large specific surface area.
A preparation method of a lithium battery negative electrode comprises the following steps:
the method comprises the following steps: coating the prepared adhesive on a current collector, as shown in fig. 2, wherein the coating method of the adhesive comprises the following steps: coating a plurality of parallel adhesive strips A on a current collector at equal intervals, wherein the distance between two adjacent adhesive strips A is 1/2L-d; coating a plurality of parallel adhesive strips B on a current collector at equal intervals, wherein the distance between every two adjacent adhesive strips B is H-d, the adhesive strips B are perpendicular to the adhesive strips A, the coating width of the adhesive strips B is equal to that of the adhesive strips A, the humidity of the coating environment of the adhesive is kept at 70%, and the rapid drying of an adhesive machine in the adhesive coating process is prevented, wherein L is the distance between two points which are farthest away along the direction of the adhesive strips B on the produced negative electrode, d is the coating width of the adhesive strips A, and H is the distance between two points which are farthest away along the direction of the adhesive strips A on the produced negative electrode;
step two: uniformly laying a carbon nanotube film on a current collector, and rolling the carbon nanotube film by using a rolling shaft-shaped pressure head to tightly bond the carbon nanotube film and the current collector together, wherein the rolling method of the rolling shaft-shaped pressure head is to roll along an adhesive strip A or an adhesive strip B, and the rolling direction of the rolling shaft-shaped pressure head is unchanged in the whole rolling process, so that the adhesive diffused by extrusion is uniformly dispersed;
step three: coating an adhesive strip C and an adhesive strip D on the carbon nano tube film according to the coating method in the step one, wherein the coating position and the coating width of the adhesive strip C are the same as those of the adhesive strip A, and the coating position and the coating width of the adhesive strip D are the same as those of the adhesive strip B;
step four: uniformly laying the graphene film on the carbon nanotube film, and rolling the graphene film by using a rolling shaft-shaped pressure head to tightly adhere the carbon nanotube film and the graphene film together, wherein the part, which is not connected by the adhesive, between the carbon nanotube film and the graphene film is tightly adhered together according to van der waals force, and the rolling direction of the rolling shaft-shaped pressure head in the step II is consistent with that in the step II;
step five: filling the prepared lithium-conducting spraying solution into an injector, spraying in a high-voltage electric field of 25KV, wherein the spraying environment temperature is 25 ℃, the environment humidity is less than 30%, and after spray drying, forming a lithium-conducting layer, wherein the thickness of the lithium-conducting layer is preferably 5-55 nm;
step six: drying for 8h at 50 ℃, rolling by a roller-shaped pressure head, and cutting to form the finished product cathode after rolling.
The lithium-guiding spraying solution is formed by uniformly stirring and dispersing inorganic lithium salt and an organic solvent, wherein the inorganic lithium salt is lithium sulfate, and the organic solvent is a mixed solvent of methanol and ethanol;
the inorganic lithium salt is a lithium ion conductor material capable of insulating electrons, and the lithium conducting layer formed by the inorganic lithium salt can inhibit the electrolyte from contacting the intermediate layer and the carbon nanotube film, so that the reduction resistance of the electrolyte is improved, the lithium ion consumption during repair and formation of an SEI film is reduced, and the cycle performance of the lithium ion battery is improved.
The invention also comprises a lithium battery, and the preparation method of the lithium battery comprises the following steps:
s1, preparing a positive plate, namely uniformly dispersing and mixing substances such as a positive active substance, a conductive agent, a binder, a solvent and the like to prepare positive slurry, uniformly coating the positive slurry on the surface of a positive current collector, and drying, rolling, cutting and vacuum drying to form the positive plate of the lithium battery;
s2, adopting the lithium battery negative plate prepared in the step;
and S3, stacking or winding the positive and negative pole pieces to form a battery core, and then putting the battery core into a battery shell, wherein the material of the battery shell has no specific requirement in the invention, and the battery shell can be an aluminum shell, a steel shell, a plastic shell or an aluminum-plastic film, and after being sealed, the battery shell is subjected to liquid injection, formation and other operations to obtain the finished lithium battery.
Example 2
A lithium battery cathode comprises a current collector, an adhesive layer, a carbon nanotube film, an intermediate layer and a lithium guide layer, wherein the adhesive layer is coated on the current collector and is of a net structure formed by coating an adhesive in a shape like a Chinese character 'jing', the carbon nanotube film is bonded on the current collector through the adhesive layer, the intermediate layer is arranged on the carbon nanotube film, and the lithium guide layer is arranged on the intermediate layer;
the current collector is a metal substrate, and the material of the current collector can be one of copper, gold or silver;
the middle layer is a graphene film;
the lithium conducting layer is formed by conducting lithium spraying solution in an electrostatic spraying mode, wherein the lithium conducting spraying solution is prepared from a lithium ion conductor material capable of insulating electrons;
the adhesive is a mixture of sodium carboxymethylcellulose and styrene butadiene rubber latex, wherein the sodium carboxymethylcellulose accounts for 50% of the weight of the adhesive, and the styrene butadiene rubber latex accounts for 50% of the weight of the adhesive;
the carbon nanotube film contains a large number of micropore structures, and the pore diameter of each micropore is smaller than 1 micron, so that the carbon nanotube film has a large specific surface area.
A preparation method of a lithium battery negative electrode comprises the following steps:
the method comprises the following steps: coating the prepared adhesive on a current collector, as shown in fig. 2, wherein the coating method of the adhesive comprises the following steps: coating a plurality of parallel adhesive strips A on a current collector at equal intervals, wherein the distance between two adjacent adhesive strips A is 1/2L-d; coating a plurality of parallel adhesive strips B on a current collector at equal intervals, wherein the distance between every two adjacent adhesive strips B is H-d, the adhesive strips B are perpendicular to the adhesive strips A, the coating width of the adhesive strips B is equal to that of the adhesive strips A, the humidity of the coating environment of the adhesive is kept at 65%, and the rapid drying of an adhesive machine in the adhesive coating process is prevented, wherein L is the distance between two points which are farthest away along the direction of the adhesive strips B on a produced negative electrode, d is the coating width of the adhesive strips A, and H is the distance between two points which are farthest away along the direction of the adhesive strips A on the produced negative electrode;
step two: uniformly laying a carbon nanotube film on a current collector, and rolling the carbon nanotube film by using a rolling shaft-shaped pressure head to tightly bond the carbon nanotube film and the current collector together, wherein the rolling method of the rolling shaft-shaped pressure head is to roll along an adhesive strip A or an adhesive strip B, and the rolling direction of the rolling shaft-shaped pressure head is unchanged in the whole rolling process, so that the adhesive diffused by extrusion is uniformly dispersed;
step three: coating an adhesive strip C and an adhesive strip D on the carbon nano tube film according to the coating method in the step one, wherein the coating position and the coating width of the adhesive strip C are the same as those of the adhesive strip A, and the coating position and the coating width of the adhesive strip D are the same as those of the adhesive strip B;
step four: uniformly laying the graphene film on the carbon nanotube film, and rolling the graphene film by using a rolling shaft-shaped pressure head to tightly adhere the carbon nanotube film and the graphene film together, wherein the part, which is not connected by the adhesive, between the carbon nanotube film and the graphene film is tightly adhered together according to van der waals force, and the rolling direction of the rolling shaft-shaped pressure head in the step II is consistent with that in the step II;
step five: filling the prepared lithium-conducting spraying solution into an injector, spraying in a high-voltage electric field of 25KV, wherein the spraying environment temperature is 27 ℃, the environment humidity is less than 30%, and after spray drying, forming a lithium-conducting layer, wherein the thickness of the lithium-conducting layer is preferably 5-55 nm;
step six: drying for 10h at the temperature of 45 ℃, rolling by a roller-shaped pressure head, and cutting to form the finished product cathode after rolling.
The lithium-conducting spray solution is formed by uniformly stirring and dispersing inorganic lithium salt and an organic solvent, wherein the inorganic lithium salt is lithium metaaluminate, and the organic solvent is isopropanol;
the invention also comprises a lithium battery, and the lithium battery cathode produced by adopting the steps is provided.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (6)
1. A lithium battery cathode is characterized by comprising a current collector, an adhesive layer, a carbon nanotube film, an intermediate layer and a lithium guide layer, wherein the adhesive layer is coated on the current collector and is of a net structure formed by coating an adhesive in a shape like a Chinese character 'jing', the carbon nanotube film is bonded on the current collector through the adhesive layer, the intermediate layer is arranged on the carbon nanotube film, and the lithium guide layer is arranged on the intermediate layer;
the middle layer is a graphene film;
the lithium conducting layer is formed by conducting lithium spraying solution in an electrostatic spraying mode, wherein the lithium conducting spraying solution is prepared from a lithium ion conductor material capable of insulating electrons;
the preparation method of the lithium ion battery cathode comprises the following steps:
the method comprises the following steps: coating the prepared adhesive on a current collector, wherein the coating method of the adhesive comprises the following steps: coating a plurality of parallel adhesive strips A on a current collector at equal intervals, wherein the distance between two adjacent adhesive strips A is 1/2L-d; coating a plurality of parallel adhesive strips B on a current collector at equal intervals, wherein the distance between every two adjacent adhesive strips B is H-d, the adhesive strips B are perpendicular to the adhesive strips A, the coating widths of the adhesive strips B are equal to those of the adhesive strips A, and the humidity of the coating environment of the adhesive is kept between 60% and 75%, wherein L is the distance between two points which are farthest away along the direction of the adhesive strips B on the produced negative electrode, d is the coating width of the adhesive strips A, and H is the distance between two points which are farthest away along the direction of the adhesive strips A on the produced negative electrode;
step two: uniformly paving the carbon nanotube film on a current collector, and rolling the carbon nanotube film by using a rolling shaft-shaped pressure head, wherein the rolling method of the rolling shaft-shaped pressure head is to roll along the adhesive strip A or the adhesive strip B, and the rolling direction of the rolling shaft-shaped pressure head is unchanged in the whole rolling process;
step three: coating an adhesive strip C and an adhesive strip D on the carbon nano tube film according to the coating method in the step one, wherein the coating position and the coating width of the adhesive strip C are the same as those of the adhesive strip A, and the coating position and the coating width of the adhesive strip D are the same as those of the adhesive strip B;
step four: uniformly laying the graphene film on the carbon nanotube film, rolling the graphene film by using a rolling shaft-shaped pressure head, and simultaneously, tightly attaching the parts, which are not connected by the adhesive, between the carbon nanotube film and the graphene film by van der waals force, wherein the rolling direction of the rolling shaft-shaped pressure head in the step II is consistent with that in the step II;
step five: filling the prepared lithium-conducting spraying solution into an injector, spraying under a high-voltage electric field of 25KV, wherein the spraying environment temperature is 23-27 ℃, the environment humidity is less than 30%, and after spray drying, forming a lithium-conducting layer with the thickness of 5-55 nm;
step six: drying for 8-10h at 45-55 ℃, rolling by a roller-shaped pressure head, and cutting to form the finished product cathode after rolling.
2. The lithium battery negative electrode as claimed in claim 1, wherein the current collector is a metal substrate, and the material of the current collector is selected from one of copper, gold, and silver.
3. The lithium battery negative electrode as claimed in claim 1, wherein the adhesive is a mixture of sodium carboxymethylcellulose and styrene-butadiene rubber latex, wherein the sodium carboxymethylcellulose accounts for 45-55% by weight of the adhesive, and the styrene-butadiene rubber latex accounts for 45-55% by weight of the adhesive.
4. A preparation method of a lithium battery cathode is characterized by comprising the following steps:
the method comprises the following steps: coating the prepared adhesive on a current collector, wherein the coating method of the adhesive comprises the following steps: coating a plurality of parallel adhesive strips A on a current collector at equal intervals, wherein the distance between two adjacent adhesive strips A is 1/2L-d; coating a plurality of parallel adhesive strips B on a current collector at equal intervals, wherein the distance between every two adjacent adhesive strips B is H-d, the adhesive strips B are perpendicular to the adhesive strips A, the coating widths of the adhesive strips B are equal to those of the adhesive strips A, and the humidity of the coating environment of the adhesive is kept between 60% and 75%, wherein L is the distance between two points which are farthest away along the direction of the adhesive strips B on the produced negative electrode, d is the coating width of the adhesive strips A, and H is the distance between two points which are farthest away along the direction of the adhesive strips A on the produced negative electrode;
step two: uniformly paving the carbon nanotube film on a current collector, and rolling the carbon nanotube film by using a rolling shaft-shaped pressure head, wherein the rolling method of the rolling shaft-shaped pressure head is to roll along the adhesive strip A or the adhesive strip B, and the rolling direction of the rolling shaft-shaped pressure head is unchanged in the whole rolling process;
step three: coating an adhesive strip C and an adhesive strip D on the carbon nano tube film according to the coating method in the step one, wherein the coating position and the coating width of the adhesive strip C are the same as those of the adhesive strip A, and the coating position and the coating width of the adhesive strip D are the same as those of the adhesive strip B;
step four: uniformly laying the graphene film on the carbon nanotube film, rolling the graphene film by using a rolling shaft-shaped pressure head, and simultaneously, tightly attaching the parts, which are not connected by the adhesive, between the carbon nanotube film and the graphene film by van der waals force, wherein the rolling direction of the rolling shaft-shaped pressure head in the step II is consistent with that in the step II;
step five: filling the prepared lithium-conducting spraying solution into an injector, spraying under a high-voltage electric field of 25KV, wherein the spraying environment temperature is 23-27 ℃, the environment humidity is less than 30%, and after spray drying, forming a lithium-conducting layer with the thickness of 5-55 nm;
step six: drying for 8-10h at 45-55 ℃, rolling by a roller-shaped pressure head, and cutting to form the finished product cathode after rolling.
5. The method for preparing the negative electrode of the lithium battery as claimed in claim 4, wherein the lithium-conducting spray solution is formed by uniformly stirring and dispersing an inorganic lithium salt and an organic solvent, wherein the inorganic lithium salt is one of lithium sulfate, lithium phosphate, lithium dihydrogen phosphate, lithium carbonate, lithium silicate, lithium borate, lithium metaborate, lithium aluminate and lithium metaaluminate, and the organic solvent is one of methanol, ethanol and isopropanol or a mixed solvent of at least two of the methanol, the ethanol and the isopropanol.
6. A lithium battery is characterized in that the preparation method of the lithium battery comprises the following steps:
s1, preparing a positive plate, namely uniformly dispersing and mixing substances such as a positive active substance, a conductive agent, a binder, a solvent and the like to prepare positive slurry, uniformly coating the positive slurry on the surface of a positive current collector, and drying, rolling, cutting and vacuum drying to form the positive plate of the lithium battery;
s2, adopting the negative plate of the lithium battery prepared in the claim 1;
and S3, stacking or winding the positive and negative pole pieces to form a battery core, placing the battery core into a battery shell, wherein the battery shell can be an aluminum shell, a steel shell, a plastic shell or an aluminum-plastic film, sealing the battery shell, injecting liquid, and forming to obtain the finished lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811082163.3A CN108963188B (en) | 2018-09-17 | 2018-09-17 | Lithium battery cathode, preparation method thereof and lithium battery |
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| CN110635109B (en) * | 2019-07-29 | 2021-07-16 | 北京航空航天大学 | Lithium metal electrode prepared by 3D printing technology and preparation method thereof |
| JP7226401B2 (en) * | 2020-07-03 | 2023-02-21 | トヨタ自動車株式会社 | electrode structure |
| CN113764839A (en) * | 2021-08-17 | 2021-12-07 | 珠海冠宇电池股份有限公司 | Pole piece and lithium battery |
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| JP2003132951A (en) * | 2001-10-25 | 2003-05-09 | Matsushita Electric Ind Co Ltd | Manufacturing method of lithium polymer secondary battery |
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