An electrode and a battery containing the electrode

Abstract

This invention provides an electrode and a battery containing the electrode. The invention involves coating the electrode with an active material layer containing a conductive agent, which is obtained by grafting a conventional conductive agent with a chelate ligand. This conductive agent can capture dissolved transition metal ions. When used in the positive electrode, it can firmly adsorb and fix the dissolved transition metal ions, preventing their migration to the negative electrode. This reduces the deposition of transition metal ions on the negative electrode surface and prevents them from damaging the SEI film on the negative electrode surface, thereby significantly improving the battery's cycle life. When used in the negative electrode, the conductive agent can lower the reduction potential of the transition metal ions, preventing them from being reduced by the negative electrode. This also reduces the deposition of transition metal ions on the negative electrode surface and prevents them from damaging the SEI film on the negative electrode surface, further significantly improving the battery's cycle life.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, specifically relating to an electrode and a battery containing the electrode. Background Technology

[0002] Batteries are widely used in electric vehicles, mobile phones, energy storage power stations, and other fields due to their high energy density and wide operating temperature range. Currently, most mainstream battery cathodes use lithium-containing transition metal oxides, such as lithium cobalt oxide, lithium manganese oxide, and nickel-cobalt-manganese ternary cathode materials.

[0003] During battery charge-discharge cycles, some transition metals in the positive electrode detach and dissolve in the electrolyte as ions. These dissolved transition metal ions migrate to the negative electrode and are adsorbed by the solid electrolyte layer (SEI film) on its surface. Due to the low potential of the negative electrode, the adsorbed transition metal ions are reduced to elemental metals. These elemental metals then catalyze the decomposition of alkyl lithium in the SEI film into lithium carbonate and ethylene, continuously exposing a fresh negative electrode surface and re-forming the SEI film. Simultaneously, the elemental metals are oxidized back to metal ions, which are then reduced back to elemental metals. This process repeats itself, causing repeated damage and repair of the SEI film, consuming electrolyte and active lithium, resulting in a short battery cycle life. Summary of the Invention

[0004] To address the problem in existing technologies where transition metal ions dissolved from the positive electrode material migrate to the negative electrode, damaging the SEI film on the negative electrode surface, consuming electrolyte and active lithium, and consequently leading to short battery cycle life, this invention provides an electrode sheet and a battery containing the aforementioned electrode sheet. This invention coats the electrode sheet with an active material layer containing a conductive agent, including a grafted modified carbon material. This conductive agent can capture dissolved transition metal ions. When used in the positive electrode sheet, it firmly adsorbs and fixes the dissolved transition metal ions, preventing their migration to the negative electrode, thereby reducing the deposition of transition metal ions on the negative electrode surface and preventing damage to the SEI film, thus significantly improving the battery cycle life. When used in the negative electrode sheet, the conductive agent lowers the reduction potential of the transition metal ions, preventing them from being reduced by the negative electrode, thereby reducing the deposition of transition metal ions on the negative electrode surface and preventing damage to the SEI film, thus significantly improving the battery cycle life.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A conductive agent comprising a grafted modified carbon material, wherein the graft in the grafted modified carbon material is a chelate ligand, the chelate ligand comprising a transition metal ion chelating functional group, the transition metal ion chelating functional group comprising -NR1R2; wherein R1 and R2 are the same or different, and are independently selected from H, -COOH, and -C. 1-6 Alkylene-COOH.

[0007] According to the present invention, in the grafted modified carbon material, the graft is grafted onto the surface of the carbon material.

[0008] According to an embodiment of the present invention, the percentage of the grafted material in the total mass of the grafted modified carbon material is 0.1 wt% to 30 wt%, for example, 0.1 wt%, 0.2 wt%, 0.5 wt%, 1.0 wt%, 1.2 wt%, 1.5 wt%, 1.7 wt%, 1.8 wt%, 2 wt%, 2.2 wt%, 2.4 wt%, 2.5 wt%, 2.7 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, or 30 wt%.

[0009] According to embodiments of the present invention, R1 and R2 may be the same or different, and are independently selected from H, -COOH, and -C. 1-3 Alkylene-COOH.

[0010] According to embodiments of the present invention, R1 and R2 may be the same or different, and are independently selected from H, -COOH, -CH2-COOH, -CH2-CH2-COOH, -CH2-CH2-CH2-COOH or -CH(CH3)-CH2-COOH.

[0011] According to embodiments of the present invention, the chelate ligand comprises one or more of the structures described below;

[0012]

[0013] The dashed lines represent chemical bonds that connect to carbon materials.

[0014] According to embodiments of the present invention, the chelate ligand includes one or more of ethylenediamine, ethylenediaminetetraacetic acid, aziridine triacetic acid, diethylenetriaminepentaacetic acid, and hydroxyethylethylenediaminetriacetic acid.

[0015] According to an embodiment of the present invention, the surface of the carbon material contains functional groups such as carboxyl groups and hydroxyl groups.

[0016] According to an embodiment of the present invention, the carbon material and the chelate ligand are connected to each other through a strong interaction, so that the chelate ligand does not detach from the carbon material in the electrolyte.

[0017] According to an embodiment of the present invention, the strong interaction can be a chemical bond.

[0018] The chemical bond mentioned above is formed, for example, by the reaction of carboxyl or hydroxyl groups on the surface of carbon materials with carboxyl or amine groups in chelate ligands.

[0019] According to embodiments of the present invention, the carbon material includes at least one of carbon nanotubes, acetylene black, Ketjen black, graphene, carbon nanofibers, conductive graphite, and conductive carbon black (SP).

[0020] According to an embodiment of the present invention, the surface of the grafted modified carbon material has chelate ligands, i.e., includes at least one chelate ligand. Exemplarily, the grafted modified carbon material is obtained by chemically grafting ethylenediaminetetraacetic acid (EDTA) onto the surface of carbon nanotubes, and its structure is shown below, where hollow circles represent carbon atoms:

[0021]

[0022] The chelate ligands can capture metal ions. For example, two or more chelate ligands can form a chelate ring with the same metal ion, as shown in the following structure:

[0023]

[0024] According to the present invention, the conductive agent is composed of the grafted modified carbon material.

[0025] When this conductive agent is applied to the positive electrode, it can firmly lock in the metal ions, fixing the transition metal ions within the positive electrode and preventing them from migrating to the negative electrode, thus preventing damage to the SEI layer and extending battery cycle life. When applied to the negative electrode, it can reduce the concentration of transition metal lithium ions, thereby lowering their reduction potential and preventing them from being reduced to elemental metals, thus avoiding damage to the SEI layer and extending battery cycle life.

[0026] The present invention also provides an electrode comprising the above-described conductive agent.

[0027] According to an embodiment of the present invention, the electrode includes a current collector and an active material layer coated on the surface of the current collector, the active material layer including the conductive agent, active material and binder described above.

[0028] According to an embodiment of the present invention, the electrode is a positive electrode or a negative electrode.

[0029] According to an embodiment of the present invention, when the electrode is a positive electrode, the active material is a positive electrode active material, and the positive electrode active material is selected from at least one of lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, nickel cobalt manganese ternary materials, nickel cobalt aluminum ternary materials, lithium manganese iron phosphate, and lithium titanate.

[0030] According to an embodiment of the present invention, when the electrode is a negative electrode, the active material is a negative electrode active material, and the negative electrode active material is selected from at least one of graphite, hard carbon, soft carbon, mesophase carbon microspheres, silicon, silicon suboxide, silicon-carbon composite material, carbon nanotubes, graphene, tin, tin oxide, and lithium titanate.

[0031] According to an embodiment of the present invention, the adhesive is selected from at least one of styrene-butadiene rubber, polyacrylic acid, polyacrylate, sodium carboxymethyl cellulose, polyvinylidene fluoride, and polytetrafluoroethylene.

[0032] According to the present invention, the mass percentage of each component in the active material layer is as follows:

[0033] 70-99 wt% active material, 0.5-15 wt% conductive agent, 0.5-15 wt% binder;

[0034] Preferably, the mass percentage of each component in the active material layer is:

[0035] 80-98 wt% active material, 1-10 wt% conductive agent, 1-10 wt% binder.

[0036] According to the present invention, the thickness of the active material layer is 60 μm to 130 μm.

[0037] The present invention also provides a battery comprising the aforementioned electrode plates.

[0038] According to an embodiment of the present invention, the battery is at least one of lithium-ion battery, sodium-ion battery, magnesium-ion battery, and aluminum-ion battery.

[0039] The present invention also provides an electronic device, which includes the above-described electrode or the above-described battery.

[0040] The beneficial effects of this invention are:

[0041] This invention provides an electrode and a battery containing the electrode. The invention coats the electrode with an active material layer containing a conductive agent, the conductive agent comprising a grafted modified carbon material. This conductive agent can capture dissolved transition metal ions. When used in the positive electrode, the conductive agent can firmly adsorb and fix the dissolved transition metal ions, preventing their migration to the negative electrode, thereby reducing the deposition of transition metal ions on the negative electrode surface and preventing damage to the SEI film on the negative electrode surface, thus significantly improving the cycle life of the battery. When used in the negative electrode, the conductive agent can lower the reduction potential of the transition metal ions, preventing them from being reduced by the negative electrode, thereby reducing the deposition of transition metal ions on the negative electrode surface and preventing damage to the SEI film on the negative electrode surface, thus significantly improving the cycle life of the battery.

[0042] Chelating agents containing active hydrogen react with the surfaces of the positive and negative electrodes, participating in the formation of the SEI or CEI film, while simultaneously consuming active lithium, leading to poor battery cycle performance. Therefore, compared to directly using chelating agents, grafting chelate ligands onto the surface of carbon materials can prevent the chelating agent from dissolving in the electrolyte, avoid the decomposition and gas generation of chelating agents containing active hydrogen on the electrodes, thus preventing them from losing their ability to chelate transition metal ions, and also improve the battery's cycle performance. Detailed Implementation

[0043] Chelation

[0044] When a metal atom or ion interacts with a ligand containing two or more coordinating atoms, it forms a complex with a cyclic structure; this complex is called a chelate. The ligand that can form chelates is called a chelating agent. A ligand has two or more coordinating atoms that simultaneously form a chelate ring with a central atom (or ion). Due to the cyclizing effect of chelating agents, chelates are more stable than non-chelate coordination compounds with similar composition and structure. The term "chelate" is used to describe these compounds because their molecular structure resembles the two large "claws" of a crab clamping a metal atom or ion. For example, ethylenediaminetetraacetic acid (EDTA) is a commonly used chelating agent that can form cyclic chelates with transition metal ions. The chelating agent EDTA reacts with Co... 2+ The structure of the chelate is shown in the following structural formula:

[0045]

[0046] <Preparation Methods of Conductive Agents>

[0047] The present invention also provides a method for preparing the above-mentioned conductive agent, the method comprising the following steps:

[0048] The conductive agent is prepared by mixing carbon materials, chelate ligands, and catalysts and reacting them.

[0049] The carbon materials and chelate ligands are defined as described above.

[0050] The catalyst is selected from conventional catalysts used for chelate ligand grafting in the art.

[0051] The reaction is carried out in a solvent system, the solvent being, for example, an organic solvent selected from at least one of tetrahydrofuran, toluene, acetone, and N-methylpyrrolidone.

[0052] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0053] Unless otherwise specified, the experimental methods used in the following examples are conventional methods; unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0054] The carbon nanotubes (CNTs) used in the following examples are commercially available carbon nanotubes with hydroxyl groups on their surface, purchased from the Chengdu Institute of Organic Chemistry.

[0055] Example 1

[0056] 1) Preparation of EDTA-grafted carbon nanotube materials

[0057] 5 g of carbon nanotubes, 1 g of catalyst ZrCl4, and 5 g of EDTA were mixed and ground for 10 minutes. The mixture was then added to 250 mL of tetrahydrofuran and sonicated at 50 °C for 2 hours, during which 500 mL of toluene was added dropwise. The mixture was then stirred at 80 °C for 48 hours. Finally, the mixture was filtered and the carbon nanotubes were washed with a large amount of deionized water to obtain EDTA-grafted carbon nanotubes (EDTA-g-CNTs), wherein the EDTA grafting amount was 10 wt% (calculated from the change in solid mass before and after the reaction).

[0058] 2) Cathode preparation process

[0059] Experimental group: Lithium manganese oxide (all subsequent battery materials were sourced from Zhuhai Guanyu), EDTA-g-CNT, and polyvinylidene fluoride (PVDF) were weighed out in a mass ratio of 90:5:5 and added to N-methylpyrrolidone (NMP). The mixture was stirred thoroughly and coated onto the surface of aluminum foil. It was then dried at 100°C for 12 hours to remove the solvent. The coating thickness was controlled to ensure that the positive electrode surface capacity after drying was approximately 2.0 mAh / cm². 2 The positive electrode of the experimental group was obtained.

[0060] Control group 1: The preparation process was the same as that of the experimental group, except that EDTA-g-CNT was replaced with an equal mass of CNT.

[0061] Control group 2: The preparation process was the same as that of the experimental group, except that EDTA-g-CNT was replaced with a mixture of CNT and EDTA of equal mass, wherein the mass ratio of CNT to EDTA was 9:1.

[0062] 3) Anode preparation process

[0063] Graphite, conductive agent CNT, styrene-butadiene rubber (SBR), and sodium carboxymethyl cellulose (CMC) were weighed out in a mass ratio of 90:5:2.5:2.5 and added to water. The mixture was thoroughly mixed and coated onto the surface of copper foil. The surface was then dried at 80°C for 12 hours to remove moisture. The coating thickness was controlled to ensure that the negative electrode surface capacity after drying was approximately 2.3 mAh / cm². 2 .

[0064] 4) Battery testing

[0065] The positive electrodes from the experimental group, control group 1, and control group 2 were used to assemble pouch cells (with a capacity of approximately 1.2 Ah) with the negative electrodes. The electrolyte was LiPF6 EC / DMC / EMC (volume ratio 1:1:1). The battery cycle test voltage range was 4.2–3.0 V, the test current was 0.5 C, and the test temperature was 25 °C.

[0066] Comparing the experimental group and control group 1 in Table 1, the experimental group exhibits higher battery capacity retention. This is because the positive electrode contains EDTA-grafted carbon nanotubes, which can adsorb transition metal ions dissolved from the positive electrode, preventing their migration to the negative electrode and avoiding damage to the SEI layer of the negative electrode. Therefore, the capacity retention is higher. Comparing the experimental group and control group 2 in Table 1, although control group 2 also contains EDTA that adsorbs transition metal ions, it exists in a free state and dissolves in the electrolyte. It reacts on the surfaces of the positive and negative electrodes, losing its function of adsorbing transition metal ions. Simultaneously, the reaction consumes active lithium, resulting in poorer cycle performance.

[0067] Table 1. Battery composition and cycle test results for the experimental group, control group 1, and control group 2 in Example 1.

[0068] Group Positive conductive agent 200-cycle capacity retention experimental group EDTA-g-CNT 95.1％ Control group 1 CNT 91.5％ Control group 2 CNT+EDTA 87.1％

[0069] Example 2

[0070] 1) Preparation of EDTA-g-CNT

[0071] The preparation process of EDTA-g-CNT is the same as in Example 1.

[0072] 2) Cathode preparation

[0073] Lithium manganese oxide, CNTs, and PVDF were weighed out in a 90:5:5 mass ratio and added to NMP. The mixture was stirred thoroughly and coated onto an aluminum foil surface. The foil was then dried at 100°C for 12 hours to remove the solvent. The coating thickness was controlled to achieve a positive electrode surface capacity of approximately 2.0 mAh / cm² after drying. 2 .

[0074] 3) Negative electrode

[0075] Experimental group: Graphite, EDTA-g-CNT, SBR, and CMC were weighed out in a mass ratio of 90:5:2.5:2.5 and added to water. The mixture was thoroughly prepared and coated onto the surface of copper foil. The foil was then dried at 80°C for 12 hours to remove moisture. The coating thickness was controlled to ensure that the negative electrode surface capacity after drying was approximately 2.3 mAh / cm². 2 .

[0076] Control group 1: The preparation process was the same as the experimental group, except that EDTA-g-CNT was replaced with an equal mass of CNT, i.e., graphite:CNT:SBR:CMC = 90:5:2.5:2.5.

[0077] Control group 2: The preparation process is the same as the experimental group, except that EDTA-g-CNT is replaced with a mixture of CNT and EDTA of equal mass, wherein the mass ratio of CNT:EDTA is 9:1, that is, graphite:CNT:EDTA:SBR:CMC=90:4.5:0.5:2.5:2.5.

[0078] 4) Battery testing

[0079] Same as Example 1.

[0080] Table 2. Battery composition and cycle performance test results of experimental group, control group 1, and control group 2 in Example 2.

[0081] Group Negative electrode conductive agent 200-cycle capacity retention experimental group EDTA-g-CNT 94.3％ Control group 1 CNT 91.5％ Control group 2 CNT+EDTA 87.2％

[0082] As shown in Table 2, the experimental group's battery cycle performance was higher than that of control group 1. This is because the experimental group used EDTA-g-CNT, which can adsorb transition metal ions migrating to the negative electrode, reducing the deposition potential of the transition metal ions and preventing their reduction at the negative electrode, thus reducing damage to the SEI layer. The experimental group's cycle performance was higher than that of control group 2 because although control group 2 also has EDTA with ion adsorption function, it exists in a free state and reacts at the negative electrode. Therefore, it cannot prevent the reduction of transition metal ions and the damage to the SEI layer. At the same time, the reaction consumes active lithium, resulting in poorer cycle performance.

[0083] Example 3

[0084] The other operations are the same as in Example 1, the only difference being the positive electrode, specifically:

[0085] 1) Preparation of carbon nanotube materials grafted with nitrotriacetic acid

[0086] 5 g of carbon nanotubes, 1 g of catalyst ZrCl4, and 5 g of nitric acid triacetic acid were mixed and ground for 10 minutes. The mixture was then added to 250 mL of tetrahydrofuran and sonicated at 50 °C for 2 hours, during which 500 mL of toluene was added dropwise. The mixture was then stirred at 80 °C for 48 hours. Finally, the mixture was filtered and the carbon nanotubes were washed with a large amount of deionized water to obtain nitric acid-grafted carbon nanotubes, wherein the grafting amount of nitric acid triacetic acid was 8 wt% (calculated from the change in solid mass before and after the reaction).

[0087] 2) Cathode preparation process

[0088] Experimental group: Lithium manganese oxide, nitrogen-triacetic acid-grafted carbon nanotubes, and PVDF were weighed out in a mass ratio of 90:5:5 and added to N-methylpyrrolidone (NMP). The mixture was stirred until homogeneous and then coated onto the surface of aluminum foil. The foil was dried at 100°C for 12 hours to remove the solvent. The coating thickness was controlled to ensure that the positive electrode surface capacity after drying was approximately 2.0 mAh / cm². 2 The positive electrode of the experimental group was obtained.

[0089] Control group 1: The preparation process was the same as the experimental group, except that the nitrogen-triacetic acid-grafted carbon nanotubes were replaced with an equal mass of CNTs.

[0090] Control group 2: The preparation process was the same as that of the experimental group, except that the carbon nanotubes grafted with nitrotriacetic acid were replaced with an equal mass of CNT and nitrotriacetic acid mixture, wherein the mass ratio of CNT to nitrotriacetic acid was 92:8.

[0091] Table 3. Battery composition and cycle performance test results of experimental group, control group 1, and control group 2 in Example 3.

[0092] Group Positive conductive agent 200-cycle capacity retention experimental group Nitrogen triacetic acid grafted carbon nanotubes 94.3％ Control group 1 carbon nanotubes 91.5％ Control group 2 Carbon nanotubes + nitrogen triacetic acid 84.2％

[0093] As can be seen from Table 3, nitrotriacetic acid also has the ability to complex transition metal ions. After being grafted onto carbon nanotubes, it will not be free in the battery and will lose its complexing ability due to the positive and negative electrode reactions. Furthermore, the positive and negative electrode reactions consume active lithium, thus the experimental group of batteries exhibits good cycle performance.

[0094] Example 4

[0095] The other operations are the same as in Example 1, the only difference being the positive electrode, specifically:

[0096] 1) Preparation of diethylenetriaminepentaacetic acid-grafted carbon nanotube materials

[0097] 5 g of carbon nanotubes, 1 g of ZrCl4 catalyst, and 5 g of diethylenetriaminepentaacetic acid were mixed and ground for 10 minutes. The mixture was then added to 250 mL of tetrahydrofuran and sonicated at 50 °C for 2 hours, during which 500 mL of toluene was added dropwise. The mixture was then stirred at 80 °C for 48 hours. Finally, the mixture was filtered and the carbon nanotubes were washed with a large amount of deionized water to obtain diethylenetriaminepentaacetic acid-grafted carbon nanotubes, wherein the grafting amount of diethylenetriaminepentaacetic acid was 6 wt% (calculated from the change in solid mass before and after the reaction).

[0098] 2) Cathode preparation process

[0099] Experimental group: Lithium manganese oxide, diethylenetriaminepentaacetic acid-grafted carbon nanotubes, and PVDF were weighed out in a mass ratio of 90:5:5, added to NMP, stirred evenly, and coated onto the surface of aluminum foil. The mixture was then dried at 100℃ for 12 hours to remove the solvent. The coating thickness was controlled so that the positive electrode surface capacity after drying was approximately 2.0 mAh / cm². 2 The positive electrode of the experimental group was obtained.

[0100] Control group 1: The preparation process was the same as that of the experimental group, except that the diethylenetriaminepentaacetic acid grafted carbon nanotubes were replaced with an equal mass of CNTs.

[0101] Control group 2: The preparation process was the same as that of the experimental group, except that the diethylenetriaminepentaacetic acid grafted carbon nanotubes were replaced with an equal mass of CNTs and diethylenetriaminepentaacetic acid mixture, wherein the mass ratio of CNTs to diethylenetriaminepentaacetic acid was 94:6.

[0102] Table 4. Battery composition and cycle performance test results of experimental group, control group 1, and control group 2 in Example 4.

[0103] Group Positive conductive agent 200-cycle capacity retention experimental group Diethylenetriaminepentaacetic acid-grafted carbon nanotubes 95.3％ Control group 1 carbon nanotubes 91.5％ Control group 2 Carbon nanotubes + diethylenetriaminepentaacetic acid 87.6％

[0104] As shown in Table 4, diethylenetriaminepentaacetic acid (DTIPA) has the ability to complex transition metal manganese, reducing the damage of manganese ions to the SEI layer. Furthermore, due to the binding of carbon nanotubes (there is a chemical bond between them), it does not dissolve in the electrolyte and is not reacted by the positive and negative electrodes. Therefore, the experimental group exhibits better cycle performance. In control group 2, the free DTIPA is reacted by both the positive and negative electrodes, consuming active lithium, resulting in even worse cycle performance.

[0105] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. It can also be used in sodium-ion batteries, magnesium-ion batteries, aluminum-ion batteries, etc. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery comprising an electrode sheet comprising an electrically conductive agent, characterized in that, The conductive agent comprises a grafted modified carbon material, the graft in the grafted modified carbon material is a chelate ligand selected from one or more of ethylenediaminetetraacetic acid, nitrilotriacetic acid, diethylenetriaminepentaacetic acid and hydroxyethylethylenediaminetriacetic acid; The carbon material is selected from at least one of carbon nanotubes, graphene, carbon nanofibers, conductive graphite and conductive carbon black (SP).

2. The battery of claim 1, wherein, In the grafted modified carbon material, the graft is grafted on the surface of the carbon material.

3. The battery of claim 1, wherein, The mass of the graft accounts for 0.1wt%-30wt% of the total mass of the grafted modified carbon material.

4. The battery of claim 1, wherein, The electrode piece is a positive electrode piece or a negative electrode piece.

5. The battery of claim 1, wherein, The conductive carbon black is selected from acetylene black and / or ketjen black.

6. An electronic device, comprising: The electronic device comprises the battery of any one of claims 1-5.

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