CN114242982B - Graphene-coated two-dimensional metal compound electrode material and preparation method and application thereof - Google Patents
Graphene-coated two-dimensional metal compound electrode material and preparation method and application thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 38
- 239000007772 electrode material Substances 0.000 title claims abstract description 30
- 150000002736 metal compounds Chemical class 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 238000001354 calcination Methods 0.000 claims abstract description 14
- 238000011065 in-situ storage Methods 0.000 claims abstract description 11
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- 239000007789 gas Substances 0.000 claims abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 229910052786 argon Inorganic materials 0.000 claims description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 7
- 229910001416 lithium ion Inorganic materials 0.000 claims description 7
- 239000007773 negative electrode material Substances 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical group 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims 1
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- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 150000001875 compounds Chemical class 0.000 abstract description 6
- 229910052976 metal sulfide Inorganic materials 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000010406 cathode material Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 18
- 239000010405 anode material Substances 0.000 description 8
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- 229910052744 lithium Inorganic materials 0.000 description 5
- 229910052723 transition metal Inorganic materials 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 4
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
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- 229910000314 transition metal oxide Inorganic materials 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
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- 101150058243 Lipf gene Proteins 0.000 description 2
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- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- 150000000703 Cerium Chemical class 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
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- 229910021641 deionized water Inorganic materials 0.000 description 1
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- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 239000002073 nanorod Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
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- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- -1 transition metal salt Chemical class 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
-
- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/581—Chalcogenides or intercalation compounds thereof
- H01M4/5815—Sulfides
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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
Abstract
The invention discloses a graphene-coated two-dimensional metal compound electrode material, a preparation method and application thereof, wherein the method comprises the steps of placing metal simple substance powder in a vacuum tube furnace, and then placing the metal simple substance powder in inert gas and CX 2 Calcining in a mixed gas atmosphere, and cooling with a furnace after calcining, wherein X is one or more selected from S, se and Te. The invention utilizes metal simple substance and CX 2 The carbon-coated two-dimensional metal sulfide electrode is synthesized in situ by metallothermic reaction of the compound, and the existence form of the carbon layer is graphene, so that the structural stability and the conductivity of the material are effectively improved, and the cathode material is further improvedCycling stability. The synthesis method provided by the invention is completed in one step, is convenient and fast, has low cost and is suitable for industrialized mass production.
Description
Technical Field
The invention relates to the technical field of lithium ion battery material preparation, in particular to a graphene-coated two-dimensional metal compound electrode material, and a preparation method and application thereof.
Background
The lithium ion battery is used as a secondary energy storage device, is widely applied to small portable electronic products and electric vehicles, and has extremely high application prospect. The lithium ion battery is composed of four main raw materials of a positive electrode, a negative electrode, a diaphragm and electrolyte, wherein the negative electrode material is one of key factors influencing the capacity, the cycle performance and the multiplying power performance of the lithium ion battery. The theoretical capacity of commercial graphite negative electrodes currently applied in the market is only 372mAh/g, and the research and development of negative electrode materials with higher specific capacities is an important task in the field of secondary batteries. Wherein the two-dimensional metal compound MX 2 The unique layered structure and lithium storage characteristics of (M=Mo/W/Sn and the like and X=S/Se/Te and the like) can provide theoretical specific capacity exceeding 600mAh/g, and the lithium-ion battery anode material becomes a novel anode material with development prospect. The problems of volume expansion, byproduct dissolution and the like of the single two-dimensional metal compound generally exist in the battery circulation process, so that the circulation performance is poor, and the problems can be effectively relieved by compounding the metal compound with the carbon material. At present, related two-dimensional metal compounds with higher specific capacity and more stable cycle performance have been reported to be successfully synthesized by adopting methods such as a hydrothermal method, chemical vapor deposition and the likeCarbon Material composite negative electrode Material (e.g. MoS 2 、WS 2 、MoSe 2 Etc.), most of the reported methods have the defects of complicated preparation process, low yield, high cost and the like, and stay in the laboratory stage.
Chinese patent CN 109671937a discloses an in-situ synthesis method of transition metal oxide/graphene composite material, which is substantially as follows: dissolving and mixing soluble ferric salt, soluble transition metal salt and soluble cerium salt in deionized water to obtain a uniform solution, dropwise adding a precipitator into the uniform solution, aging, filtering, washing with water, and drying to obtain a transition metal hydroxide compound precipitate; weighing graphite and potassium permanganate, mixing, adding the mixture into concentrated sulfuric acid and phosphoric acid mixed acid, reacting to obtain a gray green solution, carrying out ice bath treatment, adding a transition metal hydroxide compound for precipitation, then slowly adding hydrogen peroxide, stirring and dispersing to obtain a suspension of transition metal hydroxide/graphene oxide which mutually coats and grows, and washing, centrifuging, drying and roasting the suspension to obtain the transition metal oxide/graphene composite material. In the process of synthesizing graphene oxide in situ, the patent technology directly adds a compound of transition metal hydroxide to obtain a transition metal oxide/graphene composite material with a porous structure, wherein the specific surface area reaches 100-200m 2 /g, where CeO 2 The addition of the structure is favorable for the generation of the nano rod, and the graphene is uniformly dispersed among gaps of the product particles, so that the structure can buffer the volume expansion effect of the metal oxide in the charge-discharge cycle process and improve the electrode reaction kinetic performance. However, the technology still has the defects of complicated preparation process, low yield, high cost and the like, and cannot be industrially applied.
Disclosure of Invention
The invention aims at: aiming at the problems, the invention provides a graphene-coated two-dimensional metal compound electrode material, a preparation method and application thereof, and the invention utilizes metal simple substance and CX 2 The carbon-coated two-dimensional metal sulfide electrode is synthesized in situ through the metallothermic reaction of the compound, and the existence form of the carbon layer is graphene, so that the effect of improving is effectively achievedThe structural stability and the conductivity of the material are improved, so that the cycle stability of the anode material is improved, the synthesis method provided by the invention is completed in one step, the method is convenient and fast, the cost is low, the method is suitable for industrial mass production and use, and the defects in the prior art are overcome.
The technical scheme adopted by the invention is as follows: a method for in-situ synthesizing graphene coated two-dimensional metal compound electrode material comprises the steps of placing metal simple substance powder in a vacuum tube furnace, and then placing the metal simple substance powder in inert gas and CX 2 Calcining in a mixed gas atmosphere, and cooling with a furnace after calcining, wherein X is one or more selected from S, se and Te.
Further, the metal simple substance is one or more of Mo, W, sn and the like, and is not limited to the first three metal simple substances.
Further, the calcination temperature is 600-1000 ℃ and the calcination time is 4-6h.
Further, the temperature rising rate is 2-6 ℃/min during calcination.
Further, the inert gas is argon, argon and CX 2 The volume ratio of (2) is 100:1-10. the volume ratio is preferably within this range, if CX 2 If the volume ratio of CX is too low, the reaction time is long and the conversion is not thorough, otherwise, if CX 2 If the volume ratio of CS is too high 2 More waste, higher cost and environmental pollution.
Preferably, the metal element is Mo, and CX 2 Is CS 2 。
The invention further comprises a graphene-coated two-dimensional metal compound electrode material, and the electrode material is prepared by the method.
Further, the inner layer of the electrode material is a layered metal compound, and the outer layer is graphene.
The invention also comprises a lithium ion battery, which comprises a negative electrode material, wherein the negative electrode material is the graphene-coated two-dimensional metal compound electrode material.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the carbon-coated two-dimensional metal compound electrode material obtained by the invention has the advantages that the inner layer is a layered metal compound, the outer layer is graphene, the structure stability and the conductivity are good, and the carbon-coated two-dimensional metal compound electrode material can provide higher specific capacity and good cycle stability when being used as a negative electrode of a secondary ion battery;
2. the invention utilizes metal simple substance and CX 2 The metal thermal reaction of the type compound synthesizes the carbon-coated two-dimensional metal sulfide electrode in situ, the existence form of the carbon layer is graphene, and the structural stability and the conductivity of the material are effectively improved, so that the cycling stability of the anode material is improved.
Drawings
FIG. 1 is an SEM topography of the original molybdenum powder prior to reaction in example 1 of the invention;
FIG. 2 shows the MoS synthesized after the reaction in example 1 of the present invention 2 SEM morphology graph of the graph;
FIG. 3 is a MoS of example 1 of the present invention 2 TEM image of the graph;
FIG. 4 shows MoS in example 1 of the present invention 2 XRD pattern of the graph;
FIG. 5 is a MoS of example 1 of the present invention 2 Cyanopsis grossedentata figure and comparative example 1 MoS 2 Is a cyclic graph of (2);
FIG. 6 is a graph of the cycle of example 2 SnS @ graphic of the present invention versus comparative example 1 SnS;
FIG. 7 shows an embodiment 3 of the invention, 3 WS 2 Cyanopsis grossedentata figure and comparative example 1 WS 2 Is a cyclic graph of (a).
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Test main detection equipment
X-ray diffraction (XRD) test: x-ray diffractometer, instrument model: rigaku UltimaIV-185, japan.
Scanning Electron Microscope (SEM) test: scanning electron microscope, instrument model: FEIQuanta, netherlands.
Method for assembling CR2025 button cell
Electrode materials (example 1, example 2, example 3), acetylene black, polyvinylidene fluoride (PVDF) were prepared according to a ratio of 7:2:1, preparing slurry, coating the slurry on a copper foil, drying, cutting the dried copper foil into small discs with the diameter of about 1cm by a cutting machine to be used as a negative electrode, taking a metal lithium sheet as a counter electrode, taking Celgard2500 as a diaphragm, and carrying out EC/DMC/EMC 1:1:1 (W/W) +1M LiPF 6 As an electrolyte, a CR2025 button cell was assembled in a glove box under argon atmosphere.
Electrochemical performance test:
and (3) carrying out electrochemical performance test on the assembled battery by using a LANDCT 2001A tester (Wuhan city blue electric power electronic Co., ltd.) at a test temperature of 30 ℃ and a test voltage range of 0.01-3V, and carrying out charge and discharge at 100mAh/g in the test process.
Example 1
Preparation graphene coated MoS 2 A method of (m=mo, x=s) electrode material comprising the steps of:
s1, weighing 1g of nano-scale molybdenum powder, placing the powder into a tube furnace, and then introducing argon and CS 2 Wherein CS is 2 Is 8% by volume;
s2, setting a heating program to be at a heating speed of 4 ℃ for min, calcining the molybdenum powder, heating to 900 ℃, preserving heat for 5 hours, and cooling along with a furnace to obtain graphene-coated MoS 2 An electrode material.
Coating the obtained graphene with MoS 2 The electrode material is made into a negative electrode plate and the button cell is made for performance comparison. Wherein, the negative electrode composition is: composite anode material: conductive additive: binder = 70:20:10, adopting Celgard2500 type diaphragm, the counter electrode is lithium metal, EC/DMC/EMC 1:1:1 (W/W) +1M LiPF6 is the electrolyte.
Example 2
A method for preparing a graphene coated SnS electrode material, comprising the steps of:
s1, weighing 1g of nano-scale tin powder, placing the nano-scale tin powder into a tube furnace, and then introducing argon and CS 2 Wherein CS is 2 Is 2% by volume;
s2, setting a heating program to be at a heating speed of 5 ℃ for min, calcining tin powder, heating to 800 ℃, preserving heat for 5 hours, and cooling along with a furnace to obtain the graphene-coated SnS 2 An electrode material.
SnS obtained in the above example 2 The graphene electrode material was prepared according to the method of example 1 to prepare an electrode sheet as a negative electrode, a metallic lithium sheet as a counter electrode, celgard2500 as a separator, and a 1M carbonate solution as an electrolyte (wherein the solvent is a mixed solution of ethylene carbonate and dimethyl carbonate in a volume ratio of 1:1, and the solute is LiPF) 6 ) The CR2025 button cell was assembled in a glove box under argon atmosphere. At 100 mA.g －1 And testing the performance of the battery under the charge-discharge current density.
Example 3
Preparation graphene coated WS 2 A method of (m= W, X =s) electrode material comprising the steps of:
s1, weighing 1g of nano tungsten powder, placing the nano tungsten powder into a tube furnace, and then introducing argon and CS 2 Wherein CS is 2 Is 5% by volume;
s2, setting a heating program to be at a heating speed of 6 ℃ for min, calcining tungsten powder, heating to 700 ℃, preserving heat for 5 hours, and cooling along with a furnace to obtain the graphene-coated WS 2 An electrode material.
WS obtained in the above examples 2 The graphene electrode material was prepared according to the method of example 1 to prepare an electrode sheet as a negative electrode, a metallic lithium sheet as a counter electrode, celgard2500 as a separator, and a 1M carbonate solution as an electrolyte (wherein the solvent is a mixed solution of ethylene carbonate and dimethyl carbonate in a volume ratio of 1:1, and the solute is LiPF) 6 ) In argon atmosphereIs assembled into a CR2025 button cell in a glove box. At 100 mA.g －1 And testing the performance of the battery under the charge-discharge current density.
Comparative example 1
For the commercial MoS 2 Samples (microphone, 99.5% or more, 100 nm) were fabricated into negative electrode tabs according to the method described in example 1, assembled into button cells, and cell tests were performed under the same test conditions as in example 1.
Comparative example 2
For a commercial SnS sample (having a molten material, 99.99%,325 mesh), a negative electrode tab was fabricated according to the method described in example 1, assembled into a button cell, and a cell test was performed under the same test conditions as in example 1.
Comparative example 3
For commercially available WS 2 Samples (Ala-dine, 99.9%,2 μm) were fabricated into negative electrode tabs according to the method described in example 1, assembled into button cells, and cell tests were performed under the same test conditions as in example 1.
SEM tests showed that the material obtained in example 1 had a lamellar morphology. TEM test shows that the surface of the material sheet layer obtained in the embodiment 1 is coated with a graphene layer. XRD tests show that the main component of the material obtained in the embodiment 1 is molybdenum disulfide. The results of the constant-current charge and discharge test of the battery show that the MoS described in the example 1 under the current density of 100mA/g 2 The initial discharge specific capacity of the graphene anode material is 746.6mAh/g, and the capacity retention rate reaches 77% after 100 times of circulation. SnS described in example 2 2 The initial discharge specific capacity of the graphene anode material is 1194mAh/g, and the capacity retention rate is 42% after 20 times of circulation. WS described in example 3 2 The initial discharge specific capacity of the graphene anode material is 707mAh/g, and the capacity retention rate reaches 88% after 20 times of circulation.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. The in-situ synthesis method of the graphene-coated two-dimensional metal compound electrode material is characterized by comprising the following steps of: the metal simple substance powder is placed in a vacuum tube furnace and then is put in inert gas and CX 2 Calcining in a mixed gas atmosphere, and cooling in a furnace to obtain the alloy, wherein X is one or more of S, se and Te, and the metal simple substance is one or more of Mo, W and Sn; the inner layer of the electrode material is a layered metal compound, the outer layer of the electrode material is graphene, and the electrode material is used as a negative electrode material of a lithium ion battery.
2. The in-situ synthesis method of the graphene-coated two-dimensional metal compound electrode material according to claim 1, wherein the calcination temperature is 600-1000 ℃ and the calcination time is 4-6h.
3. The in-situ synthesis method of the graphene-coated two-dimensional metal compound electrode material according to claim 1, wherein the temperature rising rate is 2-6 ℃/min during calcination.
4. The method for in-situ synthesis of graphene-coated two-dimensional metal compound electrode material according to claim 1, wherein the inert gas is argon, argon and CX 2 The volume ratio of (2) is 100:1-10.
5. The in-situ synthesis method of a graphene-coated two-dimensional metal compound electrode material according to claim 1, wherein the metal element is Mo, and CX is a metal oxide 2 Is CS 2 。
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