TWI668902B - Electrode and electrochemical energy storage device - Google Patents

Abstract

The invention provides an electrode sheet, which comprises a conductive substrate and a conductive layer. The conductive layer contains an active material, a conductive auxiliary material, and a binder. The active substance contains activated carbon. The conductive auxiliary material includes a carbon-containing zero-dimensional material and a carbon-containing two-dimensional material. The invention also provides an electrochemical energy storage element including the electrode sheet.

Description

Electrode sheet and electrochemical energy storage element

The present invention relates to an electrode sheet and an electrochemical energy storage element, and in particular, to an electrode sheet including a conductive layer formed of a carbon-containing zero-dimensional material and a carbon-containing two-dimensional material, and an electrochemical device including the electrode sheet. Learn energy storage components.

Currently, the manufacture of electrode sheets for electrochemical energy storage elements usually uses activated carbon as the main material of the conductive layer, and the activated carbon is attached to the conductive substrate by a binder.

In order to improve the electrical properties (such as the charge and discharge rate) of electrochemical energy storage elements, the following methods are currently proposed. One is to use nanometer-level graphene, nanometer-level carbon black and activated carbon to mix and form a conductive layer through a binder. However, the above method requires the use of a large amount of nanometer-level graphene and nanometer-level carbon black, and the capacitance of the prepared electrochemical energy storage element decreases significantly with the increase of the current density.

Another way is to use curved graphene sheets instead of activated carbon and use ionic liquids as electrolytes. However, in addition to the expensive ionic liquids and increased production costs, the electrochemical storage of the electrode sheets prepared by the above method The capacitance of energy devices also decreases significantly with increasing current density.

There is another way to stack activated carbon, graphene, and carbon black layer by layer to form a multi-layered electrode sheet to reduce the interface resistance and increase the interface strength. However, this method has a special structure, complicated manufacturing methods, and limited electrical properties that can be improved.

Therefore, there is an urgent need to propose an electrode sheet and an electrochemical energy storage device including the electrode sheet. The electrode sheet can have a high capacitance and a good capacitance retention rate, so that its capacitance does not decrease significantly with the increase of the current density. In addition, the manufacturing process of such an electrode sheet is simple (for example, forming a single conductive layer).

Therefore, one aspect of the present invention is to provide an electrode sheet including a conductive layer formed of carbonaceous materials with different spatial dimensions, which can help electrons conduct in the conductive layer, thereby having good electrical performance.

Another aspect of the present invention is to provide an electrochemical energy storage element including the above-mentioned electrode sheet.

According to the above aspect of the present invention, an electrode sheet is proposed. In some embodiments, the electrode sheet includes a conductive substrate and a conductive layer. The conductive layer contains an active material, a conductive auxiliary material, and a binder. The active material includes activated carbon, wherein the activated carbon has a first surface area of 100 m ² / g to 3500 m ² / g and a first particle diameter of 0.1 μm to 500 μm, and the activated carbon is granular. The conductive auxiliary material includes a carbon-containing zero-dimensional material and a carbon-containing two-dimensional material, wherein the carbon-containing zero-dimensional material includes carbon black having a particle diameter of 0.001 μm to 50 μm, and the carbon-containing two-dimensional material includes a diameter of 0.1 μm to 100 μm Graphene sheet. Based on the total amount of active material, conductive auxiliary material and adhesive used is 100 weight percent (wt.%), The amount of active material used is 80wt.% To 96.5wt.%, And the amount of conductive auxiliary material used is 0.5wt. % To 10 wt.%, And the binder is used in an amount of 3 to 10 wt.%.

According to some embodiments of the present invention, the graphene sheet having a diameter of 50μm and 1m ² / g to 2630m ² / g surface area of the second to 1μm, said carbon black having a 1m ² / g to 3000m ² second / g of Three surface areas and a particle size of 0.01 μm to less than 1 μm, and the carbon black is round particles.

According to some embodiments of the present invention, the usage ratio of the graphene sheet to the carbon black is 1: 3 to 1:19.

According to some embodiments of the present invention, the conductive auxiliary material further includes a carbon-containing one-dimensional material, and the carbon-containing one-dimensional material includes a nano carbon tube, a carbon fiber, or a nano carbon ribbon.

According to some embodiments of the present invention, the thickness of the conductive layer is 0.001 mm to 1 mm.

According to some embodiments of the present invention, the conductive layer is formed by coating a conductive composition on the surface of the conductive substrate and undergoing a baking step. The conductive composition includes an active material, a conductive auxiliary material, A binder and a solvent, and the total solid content of the conductive composition is 10% to 50%.

According to some embodiments of the invention, the binder comprises polytetrafluoroethylene, polyvinylidene fluoride, polyphenylene vinyl compound, polyethylene oxide, polyvinyl alcohol, polydioxyethylene thiophene, polyaniline, polypyrrole, sulfonic acid Polyfluorocarbon, polydifluoroethylene, or any combination thereof.

According to some embodiments of the invention, the conductive substrate comprises a metal Sheet.

According to the above aspect of the present invention, an electrochemical energy storage element is proposed. In some embodiments, the electrochemical energy storage element includes a cavity, a two-electrode sheet, a separator, and an electrolyte. The two electrode sheets, the separator and the electrolyte are contained in the cavity. At least one of the two electrode sheets is the electrode sheet as described above.

According to some embodiments of the present invention, the electrochemical energy storage element includes a super capacitor or a lithium battery.

The conductive layer of the electrode sheet of the present invention is a three-dimensional conductive network composed of carbon-containing materials of different dimensions. Such a conductive network can improve the transmission efficiency of electrons in the conductive layer. Therefore, the electrochemical energy storage element including the electrode sheet can have a high capacity and a good capacity retention rate at different charge / discharge rates (or current densities).

100, 223A, 223B‧‧‧ conductive layer

101, 221A, 221B‧‧‧ conductive substrate

110‧‧‧active substance

120‧‧‧Carbon zero-dimensional materials

130‧‧‧ carbon-containing two-dimensional material

140, 150‧‧‧ paths

200‧‧‧ Electrochemical Energy Storage Element

210‧‧‧ Cavity

220A, 220B‧‧‧ electrode pads

230‧‧‧Isolator

240‧‧‧ Electrolyte

301, 302, 303, 304, 305, 306, 307, 308, 309‧‧‧ line segments

In order to make the above and other objects, features, advantages, and embodiments of the present invention more comprehensible, the detailed description of the drawings is as follows: [FIG. 1] An active material in a conductive layer according to an embodiment of the present invention And the distribution of conductive auxiliary materials.

FIG. 2 is a schematic cross-sectional view illustrating an electrochemical energy storage element according to some embodiments of the present invention.

[Fig. 3] A line chart showing the current density and capacitance of the supercapacitors of Examples 1 to 4 and Comparative Example 1. [Fig.

[Fig. 4] A line chart showing charge and discharge rates and capacitances of the ultracapacitors of Examples 2 and 5 and Comparative Example 1. [Fig.

[Fig. 5] A line chart showing the current density and capacitance of the ultracapacitors of Comparative Examples 1 to 4. [Fig.

The invention provides an electrode sheet and an electrochemical energy storage element including the electrode sheet. The electrode sheet includes a conductive substrate and a conductive layer, wherein the conductive layer is composed of carbon-containing materials of different dimensions to provide a three-dimensional conductive network. Such a three-dimensional conductive network can effectively improve the conduction efficiency of electrons and ions, and achieve the effect of increasing power density and energy density. For example, an electrochemical energy storage element including the electrode sheet can have good electrical properties, such as: high capacitance, Capacitance retention rate is high at high charge-discharge rate (c-rate), and better charge-discharge cycle performance.

In one embodiment, the conductive substrate includes a metal sheet. The metal sheet may include, but is not limited to, stainless steel, gold, silver, copper, molybdenum, aluminum, titanium, or any combination thereof.

In one embodiment, the conductive layer includes an active material, a conductive auxiliary material, and a binder, which are described below.

Active substance

The active substance referred to herein in the present invention contains activated carbon. In some examples, this activated carbon may have a surface area of 100 m ² / g to 3500 m ² / g and a particle size of 0.1 μm to 500 μm. In other examples, the activated carbon may be granular. Specifically, the activated carbon may be round or irregularly broken particles.

Preferably, the activated carbon may have a surface area of 1000 m ² / g to 3000 m ² / g. Preferably, the activated carbon may have a particle diameter of 1 μm to 50 μm.

When the particle size of activated carbon is too small, too much interface will increase the resistance. When the particle size of the activated carbon is too large, there are too few conductive contact points, and the conduction efficiency of electrons and / or ions is poor.

In one embodiment, the activated carbon can be activated by any known technical means, and the invention is not particularly limited herein. For example, chemical activation can be used to activate this activated carbon. Specifically, the chemical activation method is performed using a chemical material capable of providing oxidizing power, such as zinc chloride, phosphoric acid, sulfuric acid, calcium chloride, sodium hydroxide, potassium dichromate, potassium permanganate, and the like. Alternatively, in other examples, the activated carbon may be activated using a physical activation method. This physical activation method is performed using steam, propane gas, exhaust gas (a mixture of carbon dioxide and water) generated from a combustion gas, carbon dioxide gas, and the like.

Based on the total used amount of the active material, the conductive auxiliary material and the binder described later, it is 100 weight percent (wt.%), And the used amount of the active material is 80 wt.% To 96.5 wt.%. When the amount of the active material is too high or too low, the conduction efficiency of electrons and / or ions will be poor. Furthermore, since the particle size of the active material is relatively large, too much active material in the conductive layer will also cause the conductive contact points to decrease, thereby affecting the conduction efficiency of electrons and / or ions.

Conductive auxiliary material

The conductive auxiliary material of the present invention includes at least a carbon-containing zero-dimensional Materials and carbon-containing 2D materials. By including conductive auxiliary materials of different dimensions at the same time, the conduction of electrons and ions in the electrode sheet can be facilitated. In some embodiments, the conductive auxiliary material may further include a carbon-containing one-dimensional material. The specific properties of carbon-containing zero-dimensional materials, carbon-containing one-dimensional materials, and carbon-containing two-dimensional materials are described below.

Carbon-containing zero-dimensional materials

The zero-dimensional material referred to herein in the present invention may include carbon black having a particle diameter of 0.001 μm to 50 μm. Preferably, the particle size of the carbon black may be 0.01 μm to less than 1 μm. In other words, the carbon-containing zero-dimensional material of the present invention is preferably a nano-scale carbon-containing particulate material. In some examples, the carbon black may have a surface area from 1 m ² / g to 3000 m ² / g. Preferably, the carbon black may have a surface area of 10 m ² / g to 1500 m ² / g. In some examples, the carbon black is round and granular.

In particular, although carbon-containing zero-dimensional materials can be used alone as conductive auxiliary materials, carbon-only zero-dimensional materials (especially nano-scale carbon-containing zero-dimensional materials) are used alone because of electrons and / or ions. There are too many interfaces to pass through during transmission, leading to an increase in impedance, thereby deteriorating the electrical properties of the electrochemical energy storage element including the electrode sheet.

Furthermore, if the size of the carbon-containing zero-dimensional material is too large, the conductive contact is shortened, and the formed conductive path network is incomplete, which affects the transmission efficiency of electrons or ions.

In order to improve the above interface, the problem of impedance rise is often caused. The invention proposes to use a carbon-containing zero-dimensional material and a carbon-containing two-dimensional material in a conductive auxiliary material.

Carbonaceous two-dimensional material

The carbon-containing two-dimensional material referred to herein in the present invention may be a graphene sheet having a diameter of 0.1 μm to 100 μm. Preferably, the graphene sheet may have a diameter of 1 μm to 50 μm. In other words, the carbon-containing two-dimensional material of the present invention is preferably a micron-scale material. In some embodiments, the graphene sheet has a ² / g to 2630m ² g surface area of 1m /. Preferably, the graphene sheet has a surface area of 10 m ² / g to 500 m ² / g. In other embodiments, the number of layers of the graphene sheet is 1 to 10. Preferably, the number of layers of the graphene sheet is 5 to 10 layers. More preferably, the number of layers of the graphene sheet is 6 to 10.

In the present invention, a carbon-containing two-dimensional material is added to the conductive auxiliary material, and electrons or ions can be conducted along the plane of the graphene sheet, thereby reducing the number of interfaces passing through the conduction path, and thus can effectively improve the conduction efficiency of electrons or ions. Further, since the two-dimensional carbon-containing material of the present invention uses a material on the order of micrometers or micrometers, it can provide electronic or ion conductive channels and reduce the number of interfaces. The aforementioned nano-scale carbon-containing zero-dimensional material can fill the gaps between the micro-scale carbon-containing two-dimensional material and the active material, thereby constructing a three-dimensional conductive network and improving the transmission efficiency of electrons or ions.

However, it should be noted that if the carbon-containing two-dimensional material is completely used as the conductive auxiliary material, in addition to the incomplete network formed due to the large size of the carbon-containing two-dimensional material, excessive carbon-containing two-dimensional materials increase the second. The probability that the dimension plane is parallel to the conductive substrate (that is, perpendicular to the conduction direction of the electrons and ions), instead, the conduction of the electrons and ions is blocked, reducing the conduction efficiency.

Please refer to FIG. 1, which is a schematic diagram illustrating the distribution of active materials and conductive auxiliary materials in the conductive layer 100 according to an embodiment of the present invention. As shown in FIG. 1, the active material 110, the carbon-containing zero-dimensional material 120, and the carbon-containing two-dimensional material 130 are evenly distributed on the surface of the conductive substrate 101. 110 in active substance And the pores of the carbon-containing two-dimensional material 130, a carbon-containing zero-dimensional material 120 having a relatively small particle size is distributed. Therefore, in this conductive layer 100, electrons and ions can be conducted via the carbon-containing zero-dimensional material 120 and the active material 110, as shown by a path 140. Alternatively, electrons and ions can also be conducted through the plane of the carbon-containing two-dimensional material 130 as a conductive channel, as shown by the path 150. In particular, the path 150 reduces the number of interfaces that need to be passed during the conduction process, thereby achieving good conduction efficiency.

Carbonaceous one-dimensional material

The conductive auxiliary material of the present invention may further include a carbon-containing one-dimensional material. Specifically, the carbon-containing one-dimensional material referred to herein may include a nano carbon tube, a carbon fiber, a nano carbon ribbon, or any combination thereof. In one embodiment, the lengths of the nano carbon tubes and the nano carbon ribbons can be exemplified by not more than 30 μm. In addition, the diameter of the nano carbon tube and / or the width of the nano carbon ribbon may be, for example, 7 nm to 15 nm. In another embodiment, the length of the carbon fiber may be, for example, not more than 10 mm.

Carbon-containing one-dimensional materials can also provide electronic or ion pathways, reducing the interface through which conduction occurs. Furthermore, carbon-containing one-dimensional materials can further densify the three-dimensional conductive network in the conductive layer, and thus can further improve the conduction efficiency of electrons and / or ions.

In one embodiment, based on the total usage of the active material, the conductive auxiliary material and the binder described later is 100 weight percent (wt.%), And the usage of the conductive auxiliary material is 0.5 wt.% To 10 wt.%. Too much or too little conductive auxiliary material will affect the conduction efficiency of electrons or ions.

In another embodiment, the use amount of the carbon-containing two-dimensional material and the carbon-containing zero-dimensional material in the conductive auxiliary material is preferably 1: 3 to 1:19. Better The above-mentioned usage ratio may be 1: 7 to 1:19. When the usage ratio of the carbon-containing two-dimensional material and the carbon-containing zero-dimensional material is within the above range, the conduction efficiency of electrons or ions can be further improved.

Adhesive

In the present invention, the binder may include polytetrafluoroethylene, polyvinylidene fluoride, polyphenylene vinyl compound, polyethylene oxide, polyvinyl alcohol, polydioxyethylene thiophene, polyaniline, polypyrrole, and sulfonic acid polymer. Fluorocarbide, polydifluoroethylene, or any combination thereof.

In one embodiment, based on the total usage of the active material, the conductive auxiliary material and the adhesive is 100% by weight (wt.%), And the usage of the adhesive is from 3wt.% To 10wt.%. When the binder is too much, the content of the active material and the conductive auxiliary material in the conductive layer is relatively reduced, thus affecting the conduction efficiency of electrons and / or ions. On the other hand, when the amount of the binder is too small, the conductive layer is not easy to be formed and the active material and / or the conductive auxiliary material therein are liable to fall off, causing defects in the conductive layer.

In one embodiment, the conductive layer is formed by coating a conductive composition on a surface of a conductive substrate and performing a baking step. Specifically, the conductive composition may include an active material, a conductive auxiliary material, a binder, and a solvent having the above-mentioned usage amounts, wherein the total solid content of the conductive composition is 10% to 50%. In one embodiment, the solvent may include, but is not limited to, water, ethanol, acetone, N-methylpyrrolidone, or other suitable solvents.

In an embodiment, the thickness of the conductive layer (such as the conductive layer 100 shown in FIG. 1) of the present invention is preferably 0.001 mm to 1 mm. If the thickness of this conductive layer is too thin, the capacity of the electrochemical energy storage element is insufficient. However, if this guide If the thickness of the electrical layer is too thick, the impedance will increase.

The invention provides an electrochemical energy storage element. Please refer to FIG. 2, which is a schematic cross-sectional view of an electrochemical energy storage device 200 according to some embodiments of the present invention. In one embodiment, the electrochemical energy storage device 200 shown in FIG. 2 is a super capacitor, which includes a cavity 210, an electrode sheet 220A, an electrode sheet 220B, a separator 230, and an electrolyte 240. The electrode sheet 220A, the electrode sheet 220B, the separator 230, and the electrolytic solution 240 are disposed in the cavity 210. The electrode sheet 220A includes a conductive substrate 221A and a conductive layer 223A provided on a surface of the conductive substrate 221A. Similarly, the electrode sheet 220B includes a conductive substrate 221B and a conductive layer 223B provided on the surface of the conductive substrate 221B. The conductive layer 223A and the conductive layer 223B of the electrode sheet 220A and the electrode sheet 220B are oppositely disposed, and the separator 230 is provided between the conductive layer 223A and the conductive layer 223B. In this embodiment, the electrode sheet 220A and the electrode sheet 220B are similar to the electrode sheet (including the conductive layer 100 and the conductive substrate 101) shown in FIG. 1 described above.

In an embodiment where the electrochemical energy storage element 200 is a supercapacitor, the electrolytic solution 240 may further include an electrolyte and an organic solvent. In some examples, the electrolyte contains tetraethyl ammonium tetra-fluoroborate; TEABF ₄ or triethylmethylaminotetrafluoroborate. In other examples, the organic solvent includes acetonitrile or propylene carbonate.

In other examples, the electrochemical energy storage device 200 is a lithium battery. In this example, the cavity 210, the electrode sheet 220A, the electrode sheet 220B, the separator 230, and the electrolyte 240 are disposed in the same manner as the example in which the electrochemical energy storage element 200 is a super capacitor. The difference is that the electrode sheet 220A is used as a lithium battery The material of the conductive layer 223A of the electrode sheet 220A is a layered lithium-containing compound. The invention does not limit the type of lithium-containing compound used here. For example, the lithium-containing compound may include, but is not limited to, lithium iron phosphate, lithium cobaltate, lithium manganate, lithium nickel cobalt manganese, and the like.

In an embodiment where the electrochemical energy storage element 200 is a lithium battery, the electrolytic solution 240 includes a lithium salt, or may further include a sodium salt. Specifically, the lithium salt may include, but is not limited to, lithium perchlorate, lithium hexafluorophosphate, lithium tetrafluoroborate, and the like.

In one embodiment, the separator 230 (lithium battery or super capacitor) may be, for example, a polymer film. In a specific example, the high molecular polymer film may include polyethylene or polypropylene.

Hereinafter, embodiments and evaluation results of the present invention will be specifically described using a plurality of examples and comparative examples.

Example 1

Embodiment 1 uses an electrochemical energy storage device 200 (supercapacitor) as shown in FIG. 2 to measure electrical properties. Specifically, the composition of the conductive layer of the ultracapacitor of Example 1 includes 90wt.% Activated carbon (AC), 0.2wt.% Graphene sheet (GPh), 3.8wt.% Carbon black (CB), and 6wt. .% Adhesive (polyvinylidene difluoride; PVDF), and the conductive substrate is aluminum. The electrolyte used in the supercapacitor of Example 1 was 1M tetraethylammonium tetrafluoroborate (TEABF ₄ ). Regarding the composition in the supercapacitor of Example 1, it is shown in Table 1. The evaluation results of Example 1 are shown in FIG. 3.

Examples 2 to 5 and Comparative Examples 1 to 4

Examples 2 to 5 and Comparative Examples 1 to 4 were performed using the ultracapacitor as described in Example 1, except that Examples 2 to 5 and Comparative Examples 1 to 4 changed the composition of the conductive layer in the ultracapacitor. Regarding the composition of the conductive layers of Examples 2 to 5 and Comparative Examples 1 to 4, it is shown in Table 1 and will not be repeated here. The evaluation results of Examples 2 to 4 and Comparative Example 1 are shown in FIG. 3, the evaluation results of Examples 2 and 5 are shown in FIG. 4, and the evaluation results of Comparative Examples 1 to 4 are shown in FIG. 5.

AC: Activated carbon with a surface area of 2000 ± 200 m ² / g and a particle size of 6.5 ± 1.5 μm.

GPh: Graphene sheet with a surface area of 25-50 m ² / g, a diameter of 10-25 μm, and a number of layers of 6-10.

CB: carbon black with a surface area of 62 m ² / g and a particle size of 40 nm.

CNT: carbon nanotubes with a diameter of 7 to 15 nm, a length of 5 to 15 μm, and a surface area of 200 to 250 m ² / g.

G: Large graphite substrate, with a surface area of 20 m ² / g, and a particle size of 5.8 to 7.1 μm .

Evaluation method

Electric capacity

The electric capacity referred to herein in the present invention refers to the initial electric capacity of the electrochemical energy storage element. In the present invention, the electric capacity is preferably greater than 70 F / mL.

2. Capacitance maintenance rate under different charge and discharge rates

In the present invention, the capacity retention rate under different charge and discharge rates is observed by observing the capacitances of the electrochemical energy storage elements of Examples 1 to 5 and Comparative Examples 1 to 4 at different sizes of charge and discharge rates (or current density). ). The smaller the capacitance of the supercapacitor that changes with the change of the charge and discharge rate (or current density), the better the capacitance retention rate. Further, those with a good capacity retention rate can have better charge-discharge cycle performance (for example, the capacity does not significantly decay after repeated charge and discharge), which means that this electrode is suitable for use in fields such as ultracapacitors or lithium batteries.

Please refer to FIG. 3. FIG. 3 shows a line chart of the current density and capacitance of the supercapacitors in Examples 1 to 4 (respectively, the segments 301, 302, 303, and 304) and Comparative Example 1 (the segment 306). As shown in FIG. 3, when the conductive layer with the composition claimed in the present invention is used, the capacitance of the supercapacitor is greater than 70F / mL, and has a good capacitance retention rate (for example, the applied current density is increased from 0A / g to 6A (g), the capacitance of the ultracapacitors of Examples 1 to 4 can be maintained at more than 60F / mL). In particular, when the use ratio of the graphene sheet and the carbon black is within a specific range, the capacity retention rate is better (capacitance is hardly changed with current change, for example, the retention rate can reach about 98%). In addition, add a small amount The carbon-containing two-dimensional material (for example, 0.5 wt.%) Can increase the capacitance by more than 10% (compared to Comparative Example 1 described later).

Please refer to FIG. 4 and FIG. 5. FIG. 4 is a line chart showing the charge and discharge rates and capacitances of the supercapacitors in Examples 2 and 5 (line segments 302 and 305, respectively) and Comparative Example 1 (line segment 306). FIG. 5 is a line chart of the current density and capacitance of the supercapacitors of Comparative Examples 1 to 4 (respectively, line segments 306, 307, 308, and 309). When a conductive layer with a composition as claimed in the present invention is not used (that is, a carbon-containing zero-dimensional material and a carbon-containing two-dimensional material are not included at the same time), the capacitance difference and / or the capacity retention rate of the supercapacitor using such an electrode sheet are not Good, as shown in Figures 4 and 5.

By applying the electrode sheet and the electrochemical energy storage element of the present invention, since the conductive layer of the electrode sheet is a three-dimensional conductive network composed of zero-dimensional and two-dimensional (or further including one-dimensional) carbon-containing materials, electrons in the conductive layer can be improved. In the transmission efficiency, power density and energy density are improved. Therefore, the electrochemical energy storage element including the electrode sheet can have a high capacity, a good capacity maintenance rate under different charge and discharge rates (or current densities), and better charge and discharge cycle performance.

Although the present invention has been disclosed as above with several embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field to which the present invention pertains can make various modifications without departing from the spirit and scope of the present invention. Changes and retouching, so the protection scope of the present invention shall be determined by the scope of the appended patent application.

Claims (10)

An electrode sheet includes: a conductive substrate; and a conductive layer including: an active material including activated carbon, wherein the activated carbon has a first surface area of 100 m ² / g to 3500 m ² / g and 0.1 μm to 500 μm One of the first particle size, and the activated carbon is granular; a conductive auxiliary material, including a carbon-containing zero-dimensional material and a carbon-containing two-dimensional material, wherein the carbon-containing zero-dimensional material includes carbon having a particle diameter of 0.001 μm to 50 μm Black, and the carbon-containing two-dimensional material includes a graphene sheet having a diameter of 0.1 μm to 100 μm; and a bonding agent, wherein a total amount of one based on the active material, the conductive auxiliary material, and the bonding agent is 100% by weight ( wt.%), the use amount of the active material is 80wt.% to 96.5wt.%, a use amount of the conductive auxiliary material is 0.5wt.% to 10wt.%, and a use amount of the adhesive is 3wt. % To 10wt.%. The application of the electrode sheet patentable scope of item 1, wherein the graphene sheet has one of 1m ² / g to 2630m ² / g and a surface area of the second diameter of 1μm to 50μm, the carbon black having a 1m ² / g to One of the third surface areas of 3000 m ² / g and the particle diameter of 0.01 μm to less than 1 μm, and the carbon black is in the shape of round particles. The electrode sheet according to item 2 of the scope of patent application, wherein the ratio of the amount of graphene sheet to one of the carbon black is 1: 3 to 1:19. The electrode sheet according to item 1 of the scope of patent application, wherein the conductive auxiliary material further includes a carbon-containing one-dimensional material, and the carbon-containing one-dimensional material includes a nano carbon tube, a carbon fiber, a nano carbon ribbon, or a combination thereof. The electrode sheet according to item 1 of the scope of patent application, wherein one of the conductive layers has a thickness of 0.001 mm to 1 mm. The electrode sheet according to item 1 of the scope of the patent application, wherein the conductive layer is formed by coating a conductive composition on a surface of the conductive substrate and undergoing a baking step, and the conductive composition includes the The active material, the conductive auxiliary material, the adhesive and a solvent, and a total solid content of the conductive composition is 10% to 50%. The electrode sheet according to item 1 of the scope of the patent application, wherein the binder comprises polytetrafluoroethylene, polyvinylidene fluoride, polyphenylene vinyl compound, polyethylene oxide, polyvinyl alcohol, polydiethylene thiophene, poly Aniline, polypyrrole, sulfonic polyfluorocarbon, polydifluoroethylene, or any combination thereof. The electrode sheet according to item 1 of the patent application scope, wherein the conductive substrate comprises a metal sheet. An electrochemical energy storage element includes a cavity, two electrode sheets, a separator, and an electrolyte, wherein the two electrode sheets, the separator, and the electrolyte are contained in the cavity, and the two electrodes At least one of the sheets is the electrode sheet according to any one of claims 1 to 8 of the patent application scope. The electrochemical energy storage element according to item 9 of the scope of the patent application includes an ultracapacitor or a lithium battery.