CN112786834A - Positive pole piece and lithium ion battery comprising same - Google Patents

Positive pole piece and lithium ion battery comprising same Download PDF

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Publication number
CN112786834A
CN112786834A CN202110105955.3A CN202110105955A CN112786834A CN 112786834 A CN112786834 A CN 112786834A CN 202110105955 A CN202110105955 A CN 202110105955A CN 112786834 A CN112786834 A CN 112786834A
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positive electrode
cobalt
single crystal
mass
positive pole
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姚洋洋
刘颖
窦洋
娄帅宾
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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Priority to PCT/CN2022/073895 priority patent/WO2022161374A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • H01M4/364—Composites as mixtures
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
    • 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
    • H01M2004/028—Positive 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 provides a positive pole piece and a lithium ion battery comprising the same, wherein the positive pole piece comprises a positive pole material layer, a positive active substance in the positive pole material layer comprises a cobalt-free binary material and a ternary single crystal material, and the cobalt-free binary material has a chemical formula of LiNixMn1‑xO2The chemical formula of the ternary single crystal material is LiNiaCobMn1‑a‑bO2The positive pole piece not only retains the advantages of high energy density, lower cost, good cycle performance and the like of the cobalt-free binary material, but also obviously reduces the gas production of the cobalt-free material in high-temperature cycleAmount of the compound (A).

Description

Positive pole piece and lithium ion battery comprising same
Technical Field
The invention belongs to the field of lithium ion batteries, and relates to a positive pole piece and a lithium ion battery comprising the same.
Background
With the development of new energy markets, the ternary cathode material has brought a hot research and development trend due to the advantages of high energy density, high cycle, high safety and the like. In the current power market, the large-scale commercialized ternary materials such as NCM523 and NCM622 meet the requirements of power automobiles to a certain extent, and the endurance mileage, the safety performance and the like of the ternary materials are still to be improved.
The fluctuation of the cobalt element price in NCM restricts the cost control of the battery, the cobalt metal is expensive and is easy to cause pollution to the environment, the nickel-manganese layered material has the advantages of high energy density, low cost, good cycle performance and the like and has become a research hotspot in recent years, but researches find that the current cobalt-free material has serious high-temperature cycle gas generation and restricts the application of the nickel-manganese layered material in power batteries, the battery using a ternary anode material generally solves the gas generation problem by improving electrolyte, and the research shows that the electrolyte with obvious effect of inhibiting the gas generation on the ternary material has no effect on the cobalt-free material.
CN111525109A discloses a preparation method of a layered nickel-manganese binary anode material coated with a titanium-cobalt coating, which comprises the following steps: mixing the layered nickel-manganese binary anode material with a coating material containing Ti and Co elements in a reaction kettle, fully reacting the mixture by using a pH value regulator, standing the mixture, dehydrating, drying, roasting and sieving the mixture to obtain the layered nickel-manganese binary anode material coated with the titanium-cobalt coating. The layered nickel-manganese binary anode material coated with the titanium-cobalt coating has the advantages of uniform grain size, precise arrangement, small specific surface and normally distributed granularity, and the surface coating is favorable for improving the electronic conductivity and the ionic conductivity and reducing the irreversible phase change and the structural collapse in the circulating process, so the layered nickel-manganese binary anode material has higher structural stability and excellent electrochemical performance.
CN111200121A discloses a high-performance composite binary anode material, a preparation method thereof and a lithium ion battery. The composite binary anode material comprises a binary lithium nickel aluminate material and a coating layer coated on the surface of the binary lithium nickel aluminate material, wherein the coating layer mainly comprises an aluminum-containing compound and lithium sulfide. The preparation method comprises the following steps: 1) mixing hydroxide of nickel with an aluminum source, and sintering for the first time to obtain nickel oxide doped with aluminum; 2) mixing the nickel oxide doped with the aluminum element with a lithium source, and performing secondary sintering in an oxidizing atmosphere to obtain a binary lithium nickel aluminate material; 3) and mixing the binary nickel lithium aluminate material with an aluminum source, and sintering for the third time under the hydrogen sulfide atmosphere to obtain the composite binary positive electrode material.
The above schemes all have the problems of complicated preparation process and serious gas production, so that the development of a cobalt-free cathode material with less gas production is necessary.
Disclosure of Invention
The invention aims to provide a positive pole piece and a lithium ion battery comprising the same, wherein the positive pole piece comprises a positive pole material layer, a positive active substance in the positive pole material layer comprises a cobalt-free binary material and a ternary single crystal material, and the cobalt-free binary material has a chemical formula of LiNixMn1-xO2The chemical formula of the ternary single crystal material is LiNiaCobMn1-a-bO2The particle size of the ternary single crystal material is smaller than that of the cobalt-free binary material, and the positive pole piece disclosed by the invention not only retains the advantages of high energy density, low cost, good cycle performance and the like of the cobalt-free binary material, but also obviously reduces the gas production rate of the cobalt-free material in high-temperature cycle.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a positive electrode plate, which comprises a positive electrode material layer, wherein a positive active substance in the positive electrode material layer comprises a cobalt-free binary material and a ternary single crystal material, and the cobalt-free binary material has a chemical formula LiNixMn1-xO2，0.5<x<0.8, for example: 0.52, 0.56, 0.6, 0.65, 0.7, 0.75 or 0.78, etc., and the chemical formula of the ternary single crystal material is LiNiaCobMn1-a-bO2，0.5<a<0.8, for example: 0.52, 0.56, 0.6, 0.65, 0.7, 0.75 or 0.78, etc., 0.03<b<0.3, for example: 0.04, 0.06, 0.08, 0.1, 0.15, 0.2, 0.25, 0.27, etc., the particle size of the ternary single crystal material is smaller than that of the cobalt-free binary material.
The positive pole piece comprises the cobalt-free binary material and the ternary single crystal material, so that the advantages of high energy density, low cost, good cycle performance and the like of the cobalt-free binary material are reserved, and the gas production rate of the cobalt-free material in high-temperature cycle is obviously reduced.
The ternary single crystal material used in the invention can improve the overall compaction density of the positive plate and reduce particle breakage, thereby reducing the side reaction of the electrolyte and the particle breakage during the high-temperature circulation process of the battery cell and reducing gas generation, and on the other hand, the ternary single crystal material with small particle size has stable structure, is not easy to break and react with the electrolyte, and has certain advantages in high-temperature circulation.
Preferably, the cobalt-free binary material has a median particle diameter D50 of 7.6-11.6 μm, for example: 7.6 μm, 7.8 μm, 8 μm, 8.5 μm, 9 μm, 10 μm, 11 μm, 11.6 μm, or the like.
Preferably, the median particle diameter D50 of the ternary single crystal material is 2.5-4.5 μm, such as: 2.5 μm, 2.7 μm, 3 μm, 3.2 μm, 3.6 μm, 4 μm, or 4.5 μm, etc.
Preferably, the mass fraction of the ternary single crystal material is 5-40% based on 100% of the mass of the positive electrode active material, for example: 5%, 8%, 10%, 15%, 20%, 30%, 40%, etc., preferably 15% to 25%.
Preferably, the compaction density of the positive pole piece is 3.2-3.6 g/cm3For example: 3.2g/cm3、3.25g/cm3、3.3g/cm3、3.35g/cm3、3.4g/cm3、3.45g/cm3、3.5g/cm3Or 3.6g/cm3And the like.
Preferably, the mass fraction of the positive electrode active material is 95 to 97% based on 100% of the mass of the positive electrode material layer, for example: 95%, 95.2%, 95.6%, 95.8%, 96%, 96.3%, 96.5%, 97%, etc.
Preferably, the positive electrode material layer further comprises a conductive agent and a binder.
Preferably, the mass fraction of the conductive agent is 1-3% based on 100% of the mass of the positive electrode material layer, for example: 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, 2.5%, 3%, etc.
Preferably, the mass fraction of the binder is 1-1.5% based on 100% of the mass of the positive electrode material layer, such as: 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, etc.
Preferably, the conductive agent comprises any one of or a combination of at least two of a particulate carbon material, carbon nanotubes, conductive carbon fibers, or graphene.
Preferably, the particulate carbon material comprises any one of acetylene black, ketjen black, conductive carbon black super P, or superconducting carbon black, or a combination of at least two thereof.
In a second aspect, the present invention provides a lithium ion battery, which includes the positive electrode plate according to the first aspect.
Preferably, the lithium ion battery further comprises a negative electrode plate, the negative electrode plate comprises a negative electrode material layer, and a negative electrode active material in the negative electrode material layer comprises a graphite active material and/or a silicon-based active material.
Preferably, the silicon-based active material comprises a silicon oxygen material and/or a silicon carbon material.
Preferably, the mass fraction of the silicon-based active material is 0.1 to 5% based on 100% by mass of the negative electrode active material, for example: 0.1%, 0.3%, 0.5%, 1%, 2%, 3%, 4%, or 5%, etc.
According to the invention, a small amount of silicon-based active substance is used for replacing graphite active substance, so that on one hand, the integral gram capacity of the negative electrode can be improved, and the surface density and the thickness of the negative electrode are reduced, and as the assembly ratio of the battery core is a fixed value, the surface density and the thickness of the negative electrode sheet are reduced, the design compaction of the positive electrode sheet (namely the thickness of the positive electrode sheet is increased) can also be reduced, and the breakage of positive electrode particles and graphite particles is reduced, so that the side reaction of an electrolyte and the particle breakage part in the high-temperature circulation process of the battery core is reduced, and the gas generation is reduced.
Compared with the prior art, the invention has the following beneficial effects:
(1) the positive pole piece comprises the cobalt-free binary material and the ternary single crystal material, so that the advantages of high energy density, low cost, good cycle performance and the like of the cobalt-free binary material are reserved, and the gas production rate of the cobalt-free material in high-temperature cycle is obviously reduced.
(2) According to the invention, the ternary single crystal is doped in the cobalt-free binary material, so that the overall compaction density of the positive plate can be improved, and the particle breakage is reduced, thereby reducing the side reaction of the electrolyte and the particle breakage place in the high-temperature circulation process of the battery cell and reducing the gas generation. The ternary single crystal material has a stable structure, is not easy to break, is not easy to react with electrolyte, and can improve the high-temperature cycle performance of the positive pole piece.
(3) The positive pole piece of the invention generates gas only below 1.85ml/Ah after being circulated for 600 weeks at high temperature (45 ℃), the capacity retention rate after being circulated for 600 weeks at high temperature (45 ℃) can reach more than 92.3%, and the capacity retention rate after being circulated for 600 weeks at normal temperature can also reach more than 96%.
Drawings
Fig. 1 is an SEM image of a positive electrode active material composed of a cobalt-free binary material and a ternary single crystal material described in example 1, where a is the cobalt-free binary material and B is the ternary single crystal material.
FIG. 2 is a LiNi as described in example 10.7Mn0.3O2And LiNi0.6Co0.2Mn0.2O2The SEM partial enlarged view of the formed positive electrode active material, wherein A is a cobalt-free binary material, and B is a ternary single crystal material.
Fig. 3 is a graph comparing the 1C charge-discharge cycle curves of the lithium ion batteries described in application example 1 and application comparative example 1.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a positive pole piece, which is prepared by the following method:
LiNi of 8 μm with 76.3g D50-0.7Mn0.3O219.1g D50-3 μm LiNi0.6Co0.2Mn0.2O2Adding 2g SP, 23.2g CNT (solid content 4.3%) and 1.6g polyvinylidene fluoride into 80ml N-methyl pyrrolidone, stirring, coating on the surface of aluminum foil, drying, and rolling to 3.55g/cm3And obtaining the positive pole piece.
In this embodiment, the ternary single crystal material accounts for 20% of the total mass of the ternary single crystal material and the cobalt-free binary material.
The SEM image of the positive active material composed of the ternary single crystal material and the cobalt-free binary material in this example is shown in fig. 1-2, and it can be seen from fig. 1-2 that the small-particle-size ternary single crystal material fills in the gap of the large-particle-size cobalt-free binary material, thereby increasing the compaction density of the material.
Example 2
The embodiment provides a positive pole piece, which is prepared by the following method:
LiNi of 76.3g D50 ═ 8.2 μm0.6Mn0.4O2And 2.7 μm LiNi in 19.1g D50%0.7Co0.1Mn0.2O2Adding 2g of SP, 23.2g of carbon nano tube (solid content is 4.3%) and 1.6g of polyvinylidene fluoride into 80ml of N-methylpyrrolidone, uniformly stirring, coating on the surface of an aluminum foil, drying, and rolling to 3.45g/cm3And obtaining the positive pole piece.
In this embodiment, the ternary single crystal material accounts for 20% of the total mass of the ternary single crystal material and the cobalt-free binary material.
Example 3
The embodiment provides a positive pole piece, which is prepared by the following method:
converting 72g D50 to 8 μm LiNi0.7Mn0.3O224.5g D50-3.2 μm LiNi0.7Co0.1Mn0.2O21.467g SP, 17.054g carbon nanotubes (4.3% solids content) andadding 1.3g polyvinylidene fluoride into 80ml N-methyl pyrrolidone, stirring, coating on the surface of aluminum foil, drying, and rolling to 3.48g/cm3And obtaining the positive pole piece.
In this embodiment, the ternary single crystal material accounts for 26% of the total mass of the ternary single crystal material and the cobalt-free binary material.
Example 4
This example differs from example 1 only in that LiNi0.7Mn0.3O2Has a mass of 90.6g and LiNi0.6Co0.2Mn0.2O2The mass of (2) was 4.8g (5% by mass of the ternary single-crystal material), and the other conditions and parameters were exactly the same as those in example 1.
Example 5
This example differs from example 1 only in that LiNi0.7Mn0.3O2Has a mass of 57.2g and LiNi0.6Co0.2Mn0.2O2Was 38.2g (mass fraction of the ternary single-crystal material: 40%), and the other conditions and parameters were exactly the same as those in example 1.
Example 6
This example differs from example 1 only in that LiNi0.7Mn0.3O2Has a mass of 92.5g and LiNi0.6Co0.2Mn0.2O2The mass of (2.9 g) (the mass fraction of the ternary single-crystal material is 3%) and other conditions and parameters were exactly the same as those in example 1.
Example 7
This example differs from example 1 only in that LiNi0.7Mn0.3O2Has a mass of 52.5g and LiNi0.6Co0.2Mn0.2O2The mass of (2) was 42.9g (mass fraction of ternary single-crystal material: 45%), and the other conditions and parameters were exactly the same as those in example 1.
Comparative example 1
This comparative example differs from example 1 only in that LiNi0.7Mn0.3O2The mass of (2) was 95.4g, without addition of ternary single crystal material.
Application example 1
The application example provides a lithium ion battery, and the lithium ion battery comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and an aluminum-plastic film. The positive pole piece is prepared in the embodiment 1, and the negative pole piece is prepared according to the following method:
adding 96.2g of graphite, 1g of SP, 1g of MAC800 and 3.75g of SBR (solid content 48%) into 105ml of water, uniformly stirring, coating on the surface of a copper foil, drying, and rolling to 1.65g/cm3And obtaining the negative pole piece.
The diaphragm is a bright bead conventional pore diaphragm (the porosity is about 38%, the thickness is 12+2+1+1), the solvent of the electrolyte comprises ethylene carbonate, diethyl carbonate and methyl ethyl carbonate, the volume ratio of the ethylene carbonate to the diethyl carbonate to the methyl ethyl carbonate is 3:4:3, the solute of the electrolyte is lithium hexafluorophosphate, and the concentration of the lithium hexafluorophosphate is 1.0 mol/L.
Application example 2
The difference between the application example and the application example 1 is only that the positive electrode sheet prepared in the embodiment 2 is adopted as the positive electrode sheet, and other conditions and parameters are completely the same as those of the application example 1.
Application example 3
The difference between the application example and the application example 1 is only that the positive electrode sheet prepared in the embodiment 3 is adopted as the positive electrode sheet, and other conditions and parameters are completely the same as those of the application example 1.
Application example 4
The difference between the application example and the application example 1 is only that the positive electrode piece prepared in the embodiment 4 is adopted as the positive electrode piece, and other conditions and parameters are completely the same as those of the application example 1.
Application example 5
The difference between the application example and the application example 1 is only that the positive electrode sheet prepared in the embodiment 5 is adopted, and other conditions and parameters are completely the same as those of the application example 1.
Application example 6
The difference between the application example and the application example 1 is only that the positive electrode sheet prepared in the embodiment 6 is adopted as the positive electrode sheet, and other conditions and parameters are completely the same as those of the application example 1.
Application example 7
The difference between the application example and the application example 1 is only that the positive electrode sheet prepared in the embodiment 7 is adopted, and other conditions and parameters are completely the same as those in the application example 1.
Application example 8
The present application example differs from application example 1 only in that 96.2g of graphite was replaced with 94.276g of graphite and 1.924g of silica, and the other conditions and parameters were exactly the same as in application example 1.
Comparative example 1 was used
The difference between the comparative example of the application and the application example 1 is only that the positive electrode piece prepared in the comparative example 1 is adopted as the positive electrode piece, and other conditions and parameters are completely the same as those in the application example 1.
And (3) performance testing:
the lithium ion batteries prepared in application examples 1 to 8 and comparative example 1 were tested under the test conditions of 45 ℃ and 1C CC-CV/1C 100% DOD cycle, and the test results are shown in Table 1:
TABLE 1
Figure BDA0002917667380000091
Figure BDA0002917667380000101
As can be seen from Table 1, according to application examples 1 to 8, the positive electrode plate of the invention generates gas only below 1.85ml/Ah after being cycled for 600 weeks at high temperature (45 ℃), the capacity retention rate can reach more than 92.3%, and the capacity retention rate can also reach more than 96% after being cycled for 600 weeks at normal temperature.
Compared with application example 1 and application examples 4-7, in the positive active material of the positive pole piece, the mass fraction of the ternary single crystal material can influence the performance of the prepared battery, and the gas production rate of the lithium ion battery can be better reduced and the cycle retention rate of the battery can be improved by optimizing the mass fraction of the ternary single crystal material to 5-40%.
A comparative graph of 1C charge-discharge cycle curves of the lithium ion battery described in application example 1 and application comparative example 1 is shown in fig. 3, and it can be seen from fig. 3 that the cathode is doped with 20% ternary single crystal material, which not only can reduce gas production, but also finds that the present invention has an obvious effect of improving high-temperature cycle of a cobalt-free system.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (10)

1. The positive pole piece is characterized by comprising a positive pole material layer, wherein a positive active substance in the positive pole material layer comprises a cobalt-free binary material and a ternary single crystal material, and the cobalt-free binary material has a chemical formula of LiNixMn1- xO2，0.5<x<0.8, the chemical formula of the ternary single crystal material is LiNiaCobMn1-a-bO2，0.5<a<0.8，0.03<b<0.3, the grain size of the ternary single crystal material is smaller than that of the cobalt-free binary material.
2. The positive electrode sheet according to claim 1, wherein the cobalt-free binary material has a median particle diameter D50 of 7.6 to 11.6 μm;
preferably, the median particle diameter D50 of the ternary single crystal material is 2.5-4.5 μm.
3. The positive electrode sheet according to claim 1 or 2, wherein the ternary single crystal material is present in a mass fraction of 5 to 40%, preferably 15 to 25%, based on 100% by mass of the positive electrode active material.
4. The positive electrode sheet according to any one of claims 1 to 3, wherein the positive electrode sheet has a compacted density of3.2～3.6g/cm3。
5. The positive electrode sheet according to any one of claims 1 to 4, wherein the positive electrode active material is contained in an amount of 95 to 97% by mass based on 100% by mass of the positive electrode material layer.
6. The positive electrode plate as claimed in any one of claims 1 to 5, wherein the positive electrode material layer further comprises a conductive agent and a binder;
preferably, the mass fraction of the conductive agent is 1-3% based on 100% of the mass of the positive electrode material layer;
preferably, the mass fraction of the binder is 1-1.5% based on 100% of the mass of the positive electrode material layer.
7. The positive electrode sheet according to claim 6, wherein the conductive agent comprises any one or a combination of at least two of a particulate carbon material, carbon nanotubes, conductive carbon fibers, or graphene;
preferably, the particulate carbon material comprises any one of acetylene black, ketjen black, conductive carbon black super P, or superconducting carbon black, or a combination of at least two thereof.
8. A lithium ion battery comprising the positive electrode sheet according to any one of claims 1 to 7.
9. The lithium ion battery of claim 8, further comprising a negative electrode sheet comprising a negative electrode material layer, wherein the negative electrode active material in the negative electrode material layer comprises a graphite-based active material and/or a silicon-based active material.
10. The lithium ion battery of claim 9, wherein the silicon-based active material comprises a silicon oxygen material and/or a silicon carbon material;
preferably, the mass fraction of the silicon-based active material is 0.1-5% based on 100% of the mass of the negative electrode active material.
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2022161374A1 (en) * 2021-01-26 2022-08-04 蜂巢能源科技股份有限公司 Positive electrode plate and lithium ion battery comprising same

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