CN113555556A - Lithium ion battery negative plate, preparation method thereof and lithium ion battery - Google Patents

Lithium ion battery negative plate, preparation method thereof and lithium ion battery Download PDF

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CN113555556A
CN113555556A CN202110756741.2A CN202110756741A CN113555556A CN 113555556 A CN113555556 A CN 113555556A CN 202110756741 A CN202110756741 A CN 202110756741A CN 113555556 A CN113555556 A CN 113555556A
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negative electrode
lithium ion
ion battery
negative
binder
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车佩佩
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Envision Power Technology Jiangsu Co Ltd
Envision Ruitai Power Technology Shanghai Co Ltd
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Envision Power Technology Jiangsu Co Ltd
Envision Ruitai Power Technology Shanghai Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention provides a lithium ion battery negative plate, a preparation method thereof and a lithium ion battery, wherein the lithium ion battery negative plate comprises a negative current collector and a negative functional layer coated on the surface of the negative current collector, the negative functional layer comprises a negative active material, a conductive agent and a binder, and the content of the binder is 1.5-3.5% by taking the mass of the negative functional layer as 100%. The preparation method of the lithium ion battery negative plate comprises the following steps: and mixing the negative electrode active material, the conductive agent, the binder and the solvent to obtain negative electrode slurry, coating the negative electrode slurry on a negative electrode current collector, drying and rolling to obtain the lithium ion battery negative plate. The lithium ion battery negative plate can improve the rate capability and the cycle performance of the lithium ion battery.

Description

Lithium ion battery negative plate, preparation method thereof and lithium ion battery
Technical Field
The invention belongs to the technical field of batteries, and relates to a lithium ion battery negative plate, a preparation method thereof and a lithium ion battery.
Background
Lithium ion batteries are widely used in new energy vehicles, consumer electronics products, energy storage and other mobile or fixed energy storage scenarios. New energy automobiles and energy storage applications have high requirements on the charge-discharge multiplying power and the cycle life of lithium ion batteries. Higher multiplying power means faster charging and discharging, is convenient for consumers to use, and longer cycle life can make the use mileage and the age of new energy automobile and energy storage facility longer, brings practical value for the customer.
The structural stability and the dynamic performance of the negative electrode of the lithium ion battery have obvious influence on the rate capability and the cycle performance of the battery, the structural stability of the negative electrode is greatly influenced by the negative electrode binder, and because the graphite negative electrode continuously expands and contracts in the charging and discharging processes, the binding force between the graphite active material and the binder of the negative electrode is gradually reduced along with the circulation of the battery, the structure is unstable, and the available capacity of the battery is continuously attenuated. On the other hand, the adhesion of the functional layer containing the anode active material to the anode current collector also gradually decreases with the increase in the cycle, so that the contact resistance of the functional layer and the current collector becomes large, resulting in the deterioration of the battery capacity. In addition, since the negative electrode binder is mostly an electron insulator, it is not favorable for electron conductivity of the negative electrode, and is also unfavorable for rate performance of the battery.
CN109659492A discloses a lithium ion battery negative plate, a preparation method thereof and a lithium ion battery, wherein the lithium ion battery negative plate comprises a current collector and a lithium ion battery negative electrode composition coated on the surface of the current collector; the negative electrode composition includes a negative electrode active material, a conductive agent, and a binder; the binder includes a first binder, which is an acrylic polymer. The negative electrode slurry used by the lithium ion battery negative electrode piece adopts the acrylic acid polymer or the mixture of the acrylic acid polymer and other binders as the binders, so that the obtained negative electrode slurry can keep non-layering, non-precipitation and stable viscosity for a long time, the stability of the negative electrode slurry is greatly improved, the lithium ion battery negative electrode piece prepared by using the negative electrode slurry has higher compaction density compared with the traditional negative electrode piece, and the lithium ion battery formed by using the negative electrode piece has longer cycle life and excellent discharge capacity and cycle performance. However, the rate capability of the lithium ion battery of the invention still needs to be further improved.
CN111969211A discloses a negative electrode sheet of a lithium ion battery capable of being rapidly charged at low temperature, which includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector; the negative electrode active material layer consists of a negative electrode active material, a conductive agent, a binder and a thickening agent, wherein the mass percentages of the negative electrode active material, the conductive agent, the binder and the thickening agent are respectively 95-98%, 0.5-1.5%, 1.0-3% and 0.5-1.5%; the binder is a mixture of low-temperature-resistant flexible glue and styrene butadiene rubber which are mixed according to a certain proportion; the low-temperature-resistant flexible adhesive consists of the following components in parts by weight: 500-1180 parts of mixed monomer, 0-188 parts of polymerized monomer, 1750 parts of water 1200-1750 parts of alkali liquor, 10-25 parts of emulsifier, 0-15 parts of preservative, 0.1-5 parts of initiator, 0.1-5 parts of tert-butyl hydroperoxide and 10-20 parts of zinc oxide. The invention relates to the technical field of low-temperature-resistant polymer binders, and a lithium ion battery manufactured by using the low-temperature-resistant flexible glue effectively solves the industrial problem that the lithium ion battery cannot be rapidly charged at low temperature. However, the cycle performance of the lithium ion battery of the present invention still needs to be further improved.
Therefore, in the art, it is desirable to develop a negative electrode sheet that can improve rate performance and cycle performance of a lithium ion battery.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a lithium ion battery negative plate, a preparation method thereof and a lithium ion battery. The lithium ion battery negative plate can improve the rate capability and the cycle performance of the lithium ion battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a lithium ion battery negative electrode sheet, including a negative electrode current collector and a negative electrode functional layer coated on the surface of the negative electrode current collector, where the negative electrode functional layer includes a negative electrode active material, a conductive agent, and a binder, and the structural formula of the binder is as follows:
Figure RE-GDA0003269601060000031
wherein n is 50000-200000.
In the invention, the naphthalene group in the binder can establish pi-pi interaction with graphite, so that the strong binding force of the binder and the graphite is ensured, the diimine component in the binder ensures the binding force of the binder and the negative current collector, and the diimine component is beneficial to the structural stability of the negative plate in the circulation process, so that the circulation performance of the lithium ion battery is improved. And the phenylene in the binder, which is part of the polymer main chain, can provide a conjugated network, so that the effective electronic conductivity of the whole negative plate is ensured, and the rate capability of the lithium ion battery is improved.
Preferably, the binder is contained in an amount of 1.5% to 3.5%, for example, 1.5%, 2%, 2.5%, 3%, 3.5%, or the like, based on 100% by mass of the anode functional layer. If the content of the binder is less than 1.5%, the binding force between the negative electrode active materials is reduced, so that the negative electrode active materials are easily separated and deactivated; if the content of the binder is more than 3.5%, the mass specific volume of the negative electrode active material is reduced.
Preferably, the negative active material includes graphite.
Preferably, the conductive agent includes any one of super P, conductive carbon black, carbon nanotube, flake graphite, graphene, carbon fiber, or ketjen black, or a combination of at least two thereof.
Preferably, the content of the anode active material is 94% to 98%, such as 94%, 95%, 96%, 97%, 98%, or the like, and the content of the conductive agent is 0.5% to 2.5%, such as 0.5%, 1%, 1.5%, 2%, 2.5%, or the like, based on 100% by mass of the anode functional layer.
In a second aspect, the present invention provides a preparation method of the lithium ion battery negative electrode sheet in the first aspect, including the following steps:
and mixing the negative electrode active material, the conductive agent, the binder and the solvent to obtain negative electrode slurry, coating the negative electrode slurry on a negative electrode current collector, drying and rolling to obtain the lithium ion battery negative plate.
Preferably, the solvent is N-methylpyrrolidone (NMP).
Preferably, the negative electrode current collector is a copper foil.
Preferably, the mixing is stirred mixing.
Preferably, the rotation speed of the stirring and mixing is 6000-8000rpm, such as 6000rpm, 6500rpm, 7000rpm, 7500rpm or 8000rpm, etc., and the stirring and mixing time is 1-5h, such as 1h, 2h, 3h, 4h or 5h, etc.
Preferably, the drying temperature is 60-80 ℃, such as 60 ℃, 65 ℃, 70 ℃, 75 ℃ or 80 ℃ and the like, and the drying time is 10-15h, such as 10h, 11h, 12h, 13h, 14h or 15h and the like.
In a third aspect, the present invention provides a lithium ion battery, which includes a positive plate, an electrolyte, a separator, and the negative plate according to the first aspect.
Preferably, the raw materials for preparing the positive plate comprise a nickel-cobalt-manganese ternary material, a multi-wall carbon nanotube, conductive carbon black and polyvinylidene fluoride (PVDF).
Preferably, the components of the electrolyte are ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate. Preferably, the mass ratio of the ethylene carbonate, the ethyl methyl carbonate and the dimethyl carbonate is 3:6: 1.
Compared with the prior art, the invention has at least the following beneficial effects:
the naphthalene group in the binder can establish pi-pi interaction with graphite, so that the strong binding force of the binder and the graphite is ensured, the diimine component in the binder ensures the binding force of the binder and a negative current collector, and the two aspects are favorable for the structural stability of a negative plate in the circulation process, so that the circulation performance of the lithium ion battery is improved (the capacity retention rate after 2000 cycles is 90-93%). And the phenylene in the binder as a part of the polymer main chain can provide a conjugated network, so that the effective electronic conductivity of the whole negative plate is ensured, and the rate capability of the lithium ion battery is improved (2C discharge capacity retention ratio: 95% -98%).
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 present embodiment provides a lithium ion battery negative electrode sheet, which includes a negative electrode current collector and a negative electrode functional layer coated on a surface of the negative electrode current collector, where the negative electrode functional layer includes graphite, conductive carbon black, and a binder.
The preparation method of the adhesive comprises the following steps: to a 30mL solution of acetonitrile (MeCN) was added 3.28mmol,0.6g of acenaphthenequinone (C)12H6O2) (Sigma-Aldrich), and 5..3mL of acetic acid was added to the resulting suspension. The solution was stirred under reflux until all the acenaphthenequinone dissolved. A solution of p-phenylenediamine (2.34mmol,0.25g) (TCI, Japan) in acetonitrile was then added and the new solution was stirred under reflux for an additional 5 hours. The polymer was then precipitated after cooling the solution to 0 ℃ and washed several times with cold acetonitrile.
The structural formula of the binder is as follows:
Figure RE-GDA0003269601060000051
the content of graphite is 96.2%, the content of conductive carbon black is 2.3%, and the content of a binder is 1.5% based on 100% by mass of the negative electrode functional layer.
The preparation method of the lithium ion battery negative plate comprises the following steps:
adding the graphite, the conductive carbon black and the binder in the formula ratio into a solvent NMP, mixing at a rotating speed of 6000rpm for 5h to obtain negative electrode slurry, coating the negative electrode slurry on a copper foil with the thickness of 6 mu m, drying at 60 ℃ for 15h, and rolling to obtain the lithium ion battery negative electrode sheet.
Example 2
The present embodiment provides a lithium ion battery negative electrode sheet, which includes a negative electrode current collector and a negative electrode functional layer coated on a surface of the negative electrode current collector, where the negative electrode functional layer includes graphite, conductive carbon black, and a binder.
The binder was prepared in the same manner as in example 1.
The structural formula of the binder is as follows:
Figure RE-GDA0003269601060000061
the content of graphite is 96.2%, the content of conductive carbon black is 1.8%, and the content of a binder is 2% based on 100% of the mass of the negative electrode functional layer.
The preparation method of the lithium ion battery negative plate comprises the following steps:
adding the graphite, the conductive carbon black and the binder in the formula ratio into a solvent NMP, mixing at a rotating speed of 6000rpm for 5h to obtain negative electrode slurry, coating the negative electrode slurry on a copper foil with the thickness of 6 mu m, drying at 60 ℃ for 15h, and rolling to obtain the lithium ion battery negative electrode sheet.
Example 3
The present embodiment provides a lithium ion battery negative electrode sheet, which includes a negative electrode current collector and a negative electrode functional layer coated on a surface of the negative electrode current collector, where the negative electrode functional layer includes graphite, conductive carbon black, and a binder.
The binder was prepared in the same manner as in example 1.
The structural formula of the binder is as follows:
Figure RE-GDA0003269601060000071
the content of graphite is 96.2%, the content of conductive carbon black is 0.8%, and the content of a binder is 3% based on 100% of the mass of the negative electrode functional layer.
The preparation method of the lithium ion battery negative plate comprises the following steps:
adding the graphite, the conductive carbon black and the binder in the formula ratio into a solvent NMP, mixing at a rotating speed of 6000rpm for 5h to obtain negative electrode slurry, coating the negative electrode slurry on a copper foil with the thickness of 6 mu m, drying at 60 ℃ for 15h, and rolling to obtain the lithium ion battery negative electrode sheet.
Example 4
The present embodiment provides a lithium ion battery negative electrode sheet, which includes a negative electrode current collector and a negative electrode functional layer coated on a surface of the negative electrode current collector, where the negative electrode functional layer includes graphite, conductive carbon black, and a binder.
The binder was prepared in the same manner as in example 1.
The structural formula of the binder is as follows:
Figure RE-GDA0003269601060000072
the content of graphite was 96.2%, the content of conductive carbon black was 0.5%, and the content of binder was 3.3% based on 100% by mass of the negative electrode functional layer.
The preparation method of the lithium ion battery negative plate comprises the following steps:
adding the graphite, the conductive carbon black and the binder in the formula ratio into a solvent NMP, mixing at a rotating speed of 6000rpm for 5h to obtain negative electrode slurry, coating the negative electrode slurry on a copper foil with the thickness of 6 mu m, drying at 60 ℃ for 15h, and rolling to obtain the lithium ion battery negative electrode sheet.
Comparative example 1
The comparative example is different from example 1 only in that the binder in the negative electrode functional layer is styrene-butadiene rubber, the manufacturer is Rui Wen Rui and the model is MB-451.
In the first step, 96.2 wt% of graphite as a negative active material, 1 wt% of sodium carboxymethyl cellulose (CMC-Na) as a dispersant, 0.8 wt% of carbon black as a conductive agent, and 2 wt% of Styrene Butadiene Rubber (SBR) as a binder were added to N-methylpyrrolidone (NMP) to prepare a negative electrode slurry. The slurry was coated on a copper foil having a thickness of 6 μm to prepare a negative electrode. And then drying and rolling the negative electrode to obtain the lithium ion battery negative plate.
The preparation method of the lithium ion batteries of examples 1 to 4 and comparative example 1 includes the following steps:
(1) preparation of positive plate
97.2 wt% of nickel-cobalt-manganese ternary material serving as a positive electrode active material, 0.8 wt% of multi-walled carbon nano tube serving as a conductive agent, 1 wt% of carbon black serving as a conductive agent and 1 wt% of polyvinylidene fluoride (PVDF) serving as a binder are added into a solvent NMP and uniformly mixed to obtain positive electrode slurry, and then the positive electrode slurry is coated on an aluminum foil with the thickness of 13 microns and rolled to obtain a positive electrode sheet.
(2) Preparation of lithium ion battery
And (3) stacking the positive plate, the negative plate and a separation film (the separation film is selected from an Enjie CU9 model separation film) to form a battery core, and then injecting an electrolyte into the battery core to obtain the lithium ion battery.
The electrolyte comprises ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate, and the mass ratio of the ethylene carbonate to the ethyl methyl carbonate to the dimethyl carbonate is 3:6: 1.
The lithium ion batteries prepared in examples 1 to 4 and comparative example 1 were subjected to a performance test by the following method:
(1) and (3) testing the DCR at normal temperature: placing the battery cell in a hot box at 25 ℃, testing the voltage range to be 2.8-4.3V, adjusting the battery cell capacity to 50% SOC by using 0.33C current, standing for 1h, and discharging for 30s at 4C current;
(2) low temperature DCR test: placing the battery cell in a hot box at 25 ℃, testing the voltage range to be 2.8-4.3V, adjusting the battery cell capacity to 50% SOC by using 0.33C current, placing the battery cell in a warm box at-20 ℃, standing for 6h, and discharging for 30s at 2C current;
(3) and (3) testing the normal-temperature multiplying power: placing the battery cell in a hot box at 25 ℃, testing the battery cell capacity by using 0.33C, 1C and 2C currents respectively, wherein the testing voltage range is 2.8-4.3V;
(4) and (3) cycle testing: and (3) placing the battery cell in a hot box at 25 ℃, circulating at 1C/1C, and testing at 2.8-4.3V at 100% DOD.
The results of the performance tests are shown in table 1.
TABLE 1
Figure RE-GDA0003269601060000091
As can be seen from table 1, the lithium ion batteries prepared in examples 1 to 4 have better rate performance (2C discharge capacity retention ratio: 95% to 98%) and cycle performance (capacity retention ratio: 90% to 93% after 2000 cycles), and the rate performance and cycle performance of the lithium ion batteries can be further optimized by adjusting the amount of the binder in the negative electrode functional layer.
The rate performance and cycle performance of the lithium ion battery prepared in comparative example 1 were both reduced compared to example 1.
The applicant states that the present invention is illustrated by the above examples to provide a negative electrode sheet for a lithium ion battery, a method for preparing the same, and a lithium ion battery, but the present invention is not limited to the above examples, i.e. it does not mean that the present invention must be implemented by the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (10)

1. The lithium ion battery negative plate is characterized by comprising a negative current collector and a negative functional layer coated on the surface of the negative current collector, wherein the negative functional layer comprises a negative active material, a conductive agent and a binder, and the structural formula of the binder is as follows:
Figure FDA0003147952010000011
wherein n is 50000-200000.
2. The negative electrode sheet for the lithium ion battery according to claim 1, wherein the binder is present in an amount of 1.5% to 3.5% based on 100% by mass of the negative electrode functional layer.
3. The negative electrode sheet for a lithium ion battery according to claim 1 or 2, wherein the negative active material comprises graphite;
preferably, the conductive agent includes any one of super P, conductive carbon black, carbon nanotube, flake graphite, graphene, carbon fiber, or ketjen black, or a combination of at least two thereof.
4. The lithium ion battery negative electrode sheet according to any one of claims 1 to 3, wherein the content of the negative electrode active material is 94% to 98% and the content of the conductive agent is 0.5% to 2.5% based on 100% by mass of the negative electrode functional layer.
5. The preparation method of the negative electrode plate of the lithium ion battery according to any one of claims 1 to 4, wherein the preparation method comprises the following steps:
and mixing the negative electrode active material, the conductive agent, the binder and the solvent to obtain negative electrode slurry, coating the negative electrode slurry on a negative electrode current collector, drying and rolling to obtain the lithium ion battery negative plate.
6. The method according to claim 5, wherein the solvent is N-methylpyrrolidone;
preferably, the negative electrode current collector is a copper foil.
7. The production method according to claim 5 or 6, wherein the mixing is stirring mixing;
preferably, the rotation speed of the stirring and mixing is 6000-;
preferably, the drying temperature is 60-80 ℃, and the drying time is 10-15 h.
8. A lithium ion battery, characterized in that the lithium ion battery comprises a positive electrode sheet, an electrolyte, a separator and the negative electrode sheet according to any one of claims 1 to 4.
9. The lithium ion battery of claim 8, wherein the raw materials for preparing the positive plate comprise a nickel-cobalt-manganese ternary material, multi-walled carbon nanotubes, conductive carbon black and polyvinylidene fluoride.
10. The lithium ion battery according to claim 8 or 9, wherein the electrolyte is composed of ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate;
preferably, the mass ratio of the ethylene carbonate, the ethyl methyl carbonate and the dimethyl carbonate is 3:6: 1.
CN202110756741.2A 2021-07-05 2021-07-05 Lithium ion battery negative plate, preparation method thereof and lithium ion battery Pending CN113555556A (en)

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US20150155563A1 (en) * 2012-05-31 2015-06-04 Hitachi, Ltd., Lithium ion secondary battery
CN110277559A (en) * 2019-06-17 2019-09-24 南开大学 Polyimides conductive adhesive for lithium ion battery silicon substrate cathode
CN111063884A (en) * 2019-11-08 2020-04-24 宁波锋成先进能源材料研究院 Water-based ion battery negative electrode material, water-based ion battery negative electrode and preparation method thereof, and water-based ion battery

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