CN113782729A - Lithium ion battery negative electrode slurry, lithium ion battery preparation method and lithium ion battery - Google Patents

Lithium ion battery negative electrode slurry, lithium ion battery preparation method and lithium ion battery Download PDF

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Publication number
CN113782729A
CN113782729A CN202111129721.9A CN202111129721A CN113782729A CN 113782729 A CN113782729 A CN 113782729A CN 202111129721 A CN202111129721 A CN 202111129721A CN 113782729 A CN113782729 A CN 113782729A
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lithium ion
ion battery
negative electrode
slurry
dispersing agent
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赵悠曼
陈泽伟
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Dongguan Chuangming Battery Technology Co Ltd
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Dongguan Chuangming Battery Technology 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention discloses a lithium ion battery cathode slurry, a lithium ion battery preparation method and a lithium ion battery, wherein the lithium ion battery cathode slurry comprises deionized water and a slurry body mixed in the deionized water, the slurry body comprises a cathode active material, a first dispersing agent, a second dispersing agent, a binder and a conductive agent, and the mass percent of the cathode active material, the first dispersing agent, the second dispersing agent, the binder and the conductive agent is 96-98.5%: 0.4% -0.5%: 0.1% -0.3%: 0.7% -1.5%: 0% -2%, the second dispersant is montmorillonite; the invention can thicken the negative electrode slurry to reduce the floating of the styrene butadiene rubber binder, can also prevent the negative electrode slurry from settling, and can reduce the using amount of the sodium carboxymethylcellulose and the binder to improve the effective ratio of the negative electrode active substance, thereby improving the energy density of the battery, improving the porosity of the negative electrode plate of the battery, improving the liquid absorption and storage capacity of the battery electrode plate to the electrolyte, and finally improving the long-term cycle life of the battery and the consistency of the battery.

Description

Lithium ion battery negative electrode slurry, lithium ion battery preparation method and lithium ion battery
Technical Field
The invention relates to the technical field of lithium ion battery preparation, in particular to lithium ion battery cathode slurry, a lithium ion battery preparation method and a lithium ion battery.
Background
In the existing preparation method of the lithium ion battery, the negative electrode slurry adopts sodium carboxymethyl cellulose as a dispersing agent and an anti-settling agent, but the mass ratio of the sodium carboxymethyl cellulose in the negative electrode mixture is generally more than 1%, and the larger the mass ratio of the sodium carboxymethyl cellulose in the negative electrode mixture is, the smaller the proportion of the negative electrode active substance is, namely the available capacity of the negative electrode active substance is reduced, which is not beneficial to designing the battery with high energy density.
In addition, the existing negative electrode slurry adopts Styrene Butadiene Rubber (SBR) as a binder, but the Styrene Butadiene Rubber is granular, the particle size of D50 is about 0.2um, when the solid content of the negative electrode slurry is low (for example, the solid content of the traditional lithium ion battery negative electrode slurry is about 50%), once the pole piece is baked, the Styrene Butadiene Rubber is easy to float, and after the Styrene Butadiene Rubber floats to the surface of the pole piece, the peeling force difference between the negative electrode material membrane and the base material is easy to cause material dropping in the subsequent rolling process, and the membrane is easy to drop in the later period of the cycle, so that the membrane resistance of the pole piece is increased, and the cycle performance is reduced.
Furthermore, when a high-energy-density battery is designed, the requirement on the compaction density of an electrode is high, the liquid permeability of a pole piece with high compaction density is poor, the distribution of electrolyte in the electrode is uneven, the lithium ion transmission is not facilitated, the ion conductivity in the battery is reduced, and the long-term cycle life of the battery is shortened.
Disclosure of Invention
The invention aims to provide a lithium ion battery cathode slurry, a lithium ion battery preparation method and a lithium ion battery, which can effectively thicken the cathode slurry to reduce the floating of a butadiene styrene rubber binder, can also prevent the cathode slurry from settling, and can effectively reduce the using amount of sodium carboxymethyl cellulose and the binder to improve the effective ratio of a cathode active substance, thereby improving the energy density of the battery, and can also improve the porosity of a battery cathode plate, improve the liquid absorption and storage capacity of the battery cathode plate to electrolyte, and finally improve the long-term cycle life of the battery and the consistency of the battery.
In order to achieve the purpose, the invention discloses a lithium ion battery negative electrode slurry, which comprises deionized water and a slurry body mixed in the deionized water, wherein the slurry body comprises a negative electrode active material, a first dispersing agent, a second dispersing agent, a binder and a conductive agent, and the mass percentage of the negative electrode active material, the first dispersing agent, the second dispersing agent, the binder and the conductive agent is 96% -98.5%: 0.4% -0.5%: 0.1% -0.3%: 0.7% -1.5%: 0% -2%, the second dispersant is montmorillonite.
Preferably, the solid content of the slurry body in the lithium ion battery negative electrode slurry is 55-65%.
Preferably, the negative active material is one or more of graphite, nano silicon and silicon monoxide.
Preferably, the first dispersing agent is sodium carboxymethyl cellulose.
Preferably, the binder is one or a combination of styrene-butadiene rubber, styrene-butadiene rubber modifier, polyacrylic acid and polyacrylic acid modifier.
Preferably, the conductive agent is one or more of acetylene black, conductive carbon black (SuperP-Li), carbon fiber, carbon nanotube, graphene, and the like.
Preferably, the first dispersing agent is sodium carboxymethylcellulose, the binder is styrene butadiene rubber, and the mass percentage of the negative electrode active material, the first dispersing agent, the second dispersing agent, the binder and the conductive agent is 98.5%: 0.3%: 0.3%: 0.7%: 0.2 percent, wherein the solid content of the slurry body in the lithium ion battery cathode slurry is 55 percent.
Preferably, the first dispersing agent is sodium carboxymethylcellulose, the binder is styrene butadiene rubber, and the mass percentage of the negative electrode active material, the first dispersing agent, the second dispersing agent, the binder and the conductive agent is 97.8%: 0.5%: 0.1%: 1.4%: 0.2 percent, and the solid content of the slurry body in the lithium ion battery cathode slurry is 60 percent.
Correspondingly, the invention also discloses a preparation method of the lithium ion battery, which comprises the following steps:
s1, providing a copper foil current collector and the lithium ion battery negative electrode slurry;
s2, coating the lithium ion battery negative electrode slurry on the copper foil current collector;
s3, sequentially carrying out coating, baking, rolling and flaking on the copper foil current collector, and after testing the stripping force of a pole piece diaphragm, winding and injecting liquid on the copper foil current collector, a positive pole piece and a diaphragm to obtain a semi-finished lithium ion battery;
s4, carrying out formation full charge treatment on the semi-finished lithium ion battery to obtain a cylindrical lithium ion battery;
and S5, testing the lithium ion battery.
Correspondingly, the invention also discloses a lithium ion battery which is prepared by the preparation method of the lithium ion battery.
Compared with the prior art, the montmorillonite is used for replacing part of the first dispersing agent and the binder in the negative electrode slurry, on one hand, the negative electrode slurry can be prevented from settling, the use amount of sodium carboxymethylcellulose and the binder can be effectively reduced, so that the effective ratio of a negative electrode active substance is improved, the energy density of the battery is improved, the porosity of a negative electrode plate of the battery can be improved, the liquid absorption and storage capacity of the battery plate on electrolyte is improved, and the long-term cycle life of the battery and the consistency of the battery are finally improved; on the other hand, because the montmorillonite has the water absorption characteristic, the montmorillonite is very easy to form viscous suspended matters after hydration so as to improve the solid content of the lithium ion battery negative electrode slurry and effectively reduce the water evaporation rate during subsequent coating treatment, thereby effectively preventing the adhesive from floating upward, greatly improving the stripping force of the pole piece and effectively relieving the phenomenon of material falling caused by rolling, and improving the long-term cycle performance of the lithium ion battery.
Drawings
FIG. 1 is a block flow diagram of a method of making a lithium ion battery of the present invention;
FIG. 2 is a graph comparing the test results of example 1, example 2 of the present invention and comparative example.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
The lithium ion battery of the embodiment comprises lithium ion battery cathode slurry, the lithium ion battery cathode slurry comprises deionized water and a slurry body mixed in the deionized water, the slurry body comprises a cathode active material, a first dispersing agent, a second dispersing agent, a binder and a conductive agent, wherein the mass percent of the cathode active material, the first dispersing agent, the second dispersing agent, the binder and the conductive agent is 96% -98.5%: 0.4% -0.5%: 0.1% -0.3%: 0.7% -1.5%: 0% -2%, the second dispersing agent is montmorillonite, the montmorillonite is also called nano montmorillonite and has strong water absorption characteristic, the montmorillonite can form viscous suspended matters easily after hydration in the ionized water so as to improve the solid content of the lithium ion battery cathode slurry and effectively reduce the water evaporation rate in subsequent coating treatment, thereby effectively preventing the adhesive from floating upward, greatly improving the stripping force of the pole piece and effectively relieving the phenomenon of material falling caused by rolling, and improving the long-term cycle performance of the lithium ion battery.
Preferably, the solid content of the slurry body in the lithium ion battery negative electrode slurry is 55% to 65%, that is, the deionized water accounts for 35% to 45% of the proportion of the lithium ion battery negative electrode slurry.
Preferably, the negative active material is one or more of graphite, nano silicon and silicon monoxide.
Preferably, the first dispersing agent is sodium carboxymethyl cellulose.
Preferably, the binder is one or a combination of styrene-butadiene rubber, styrene-butadiene rubber modifier, polyacrylic acid and polyacrylic acid modifier. It can be understood that due to the free characteristics of the styrene-butadiene rubber and the styrene-butadiene rubber modifier, the styrene-butadiene rubber and the styrene-butadiene rubber modifier can float in deionized water, and therefore, the negative electrode slurry can be thickened by adding the montmorillonite in the deionized water so as to reduce the floating of the styrene-butadiene rubber binder. The polyacrylic acid and polyacrylic acid modifier can not float in deionized water, so the beneficial effect of reducing the floating of the adhesive by adding the montmorillonite is only for the styrene butadiene rubber and the styrene butadiene rubber modifier.
Preferably, the conductive agent is one or more of acetylene black, conductive carbon black (SuperP-Li), carbon fiber, carbon nanotube, graphene, and the like.
The lithium ion battery cathode slurry prepared by the components and the mass percentages can effectively thicken the cathode slurry and prevent the cathode slurry from settling, and can effectively reduce the using amounts of sodium carboxymethyl cellulose and a binder so as to improve the effective ratio of the cathode active substance and improve the energy density of the battery.
Referring to fig. 1, correspondingly, the invention also discloses a method for preparing a lithium ion battery, which comprises the following steps:
s1, providing a copper foil current collector and the lithium ion battery negative electrode slurry;
s2, coating the lithium ion battery negative electrode slurry on the copper foil current collector;
s3, sequentially carrying out coating, baking, rolling and flaking on the copper foil current collector, and after testing the stripping force of a pole piece diaphragm, winding and injecting liquid on the copper foil current collector, a positive pole piece and a diaphragm to obtain a semi-finished lithium ion battery;
s4, carrying out formation full charge treatment on the semi-finished lithium ion battery to obtain a cylindrical lithium ion battery;
and S5, testing the lithium ion battery.
Example 1
In this embodiment 1, the first dispersing agent is sodium carboxymethylcellulose, the binder is styrene butadiene rubber, and the mass percentage of the negative electrode active material, the first dispersing agent, the second dispersing agent, the binder, and the conductive agent is 98.5%: 0.3%: 0.3%: 0.7%: 0.2 percent; mixing the slurry bodies with the components in deionized water, and adjusting the solid content of the slurry bodies in the lithium ion battery cathode slurry to 55%; coating the prepared lithium ion battery negative electrode slurry on the copper foil current collector; sequentially carrying out coating, baking, rolling and flaking treatment on the copper foil current collector, and after testing the stripping force of a pole piece diaphragm, winding and injecting liquid on the copper foil current collector, a positive pole piece and a diaphragm to obtain a semi-finished lithium ion battery; and carrying out formation full charge treatment on the semi-finished lithium ion battery to obtain a cylindrical lithium ion battery with the capacity of 3500 mAh.
Through multiple experiments, the membrane peeling force of the lithium ion battery obtained in the example 1 is 0.32N/25 mm; the coating effect is that the appearance of the pole piece is good; the rolling effect is that the appearance of the pole piece is good; the capacity retention rate is 86% when the cycle performance is 500 weeks.
Example 2
In this embodiment 2, the first dispersing agent is sodium carboxymethylcellulose, the binder is styrene butadiene rubber, and the mass percentages of the negative electrode active material, the first dispersing agent, the second dispersing agent, the binder, and the conductive agent are 97.8%: 0.5%: 0.1%: 1.4%: 0.2 percent. Mixing the slurry bodies with the components in deionized water, and adjusting the solid content of the slurry bodies in the lithium ion battery cathode slurry to be 60%; coating the prepared lithium ion battery negative electrode slurry on the copper foil current collector; sequentially carrying out coating, baking, rolling and flaking treatment on the copper foil current collector, and after testing the stripping force of a pole piece diaphragm, winding and injecting liquid on the copper foil current collector, a positive pole piece and a diaphragm to obtain a semi-finished lithium ion battery; and carrying out formation full charge treatment on the semi-finished lithium ion battery to obtain a cylindrical lithium ion battery with the capacity of 3500 mAh.
Through multiple experiments, the membrane peeling force of the lithium ion battery obtained in the example 2 is 0.31N/25 mm; the coating effect is that the appearance of the pole piece is good; the rolling effect is that the appearance of the pole piece is good; the capacity retention rate is 86.1 percent when the cycle performance is 500 weeks.
In order to better demonstrate the improvement of the present invention over the prior art, the present invention presents a comparative example of a lithium ion battery obtained by conventional preparation. The first dispersing agent of the comparative example is sodium carboxymethylcellulose, the binder is styrene butadiene rubber, the second dispersing agent is not used in the comparative example, and the mass percentage of the negative electrode active material, the first dispersing agent, the binder and the conductive agent is 97.1%: 1.1%: 1.6: 0.2 percent; mixing the slurry bodies with the components in deionized water, and adjusting the solid content of the slurry bodies in the lithium ion battery cathode slurry to 55%; coating the prepared lithium ion battery negative electrode slurry on the copper foil current collector; sequentially carrying out coating, baking, rolling and flaking treatment on the copper foil current collector, and after testing the stripping force of a pole piece diaphragm, winding and injecting liquid on the copper foil current collector, a positive pole piece and a diaphragm to obtain a semi-finished lithium ion battery; and carrying out formation full charge treatment on the semi-finished lithium ion battery to obtain a cylindrical lithium ion battery with the capacity of 3500 mAh.
Through multiple experiments, the membrane peeling force of the lithium ion battery obtained by the comparative example is 0.26N/25 mm; the coating effect is slurry dry material, particles and pole piece cracking, and the rolling effect is pole piece roller sticking and material dropping; the capacity retention rate is 59% at 500 weeks of cycle performance.
Fig. 2 shows a comparison of the test results of example 1, example 2 and a comparative example, and it can be clearly seen from fig. 2 that the film peeling force, the coating effect, the rolling effect and the cycle performance of the lithium ion battery prepared by the lithium ion battery preparation method of the present invention are greatly superior to those of the lithium ion battery prepared by the conventional method, and the preparation method of the lithium ion battery of the present invention has lower preparation cost and is suitable for large-scale popularization.
With reference to fig. 1 and fig. 2, the montmorillonite is used to replace part of the first dispersant and the binder in the negative electrode slurry, so that on one hand, the negative electrode slurry can be prevented from settling, the use amounts of the sodium carboxymethyl cellulose and the binder can be effectively reduced, and the effective ratio of the negative electrode active material can be improved, thereby improving the energy density of the battery, and on the other hand, the porosity of the negative electrode plate of the battery can be improved, the liquid absorption and storage capacity of the battery electrode plate to the electrolyte can be improved, and finally the long-term cycle life of the battery and the consistency of the battery can be improved; on the other hand, because the montmorillonite has the water absorption characteristic, the montmorillonite is very easy to form viscous suspended matters after hydration so as to improve the solid content of the lithium ion battery negative electrode slurry and effectively reduce the water evaporation rate during subsequent coating treatment, thereby effectively preventing the adhesive from floating upward, greatly improving the stripping force of the pole piece and effectively relieving the phenomenon of material falling caused by rolling, and improving the long-term cycle performance of the lithium ion battery.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims (10)

1. The lithium ion battery cathode slurry is characterized in that: the cathode active material, the first dispersing agent, the second dispersing agent, the binder and the conductive agent are mixed in the deionized water, and the slurry body comprises the cathode active material, the first dispersing agent, the second dispersing agent, the binder and the conductive agent in a mass percentage of 96% -98.5%: 0.4% -0.5%: 0.1% -0.3%: 0.7% -1.5%: 0% -2%, the second dispersant is montmorillonite.
2. The lithium ion battery negative electrode slurry of claim 1, wherein: the solid content of the slurry body in the lithium ion battery negative electrode slurry is 55-65%.
3. The lithium ion battery negative electrode slurry of claim 1, wherein: the negative active material is one or a combination of more of graphite, nano silicon and silicon monoxide.
4. The lithium ion battery negative electrode slurry of claim 1, wherein: the first dispersing agent is sodium carboxymethyl cellulose.
5. The lithium ion battery negative electrode slurry of claim 1, wherein: the binder is one or a combination of more of styrene butadiene rubber, styrene butadiene rubber modifier, polyacrylic acid and polyacrylic acid modifier.
6. The lithium ion battery negative electrode slurry of claim 1, wherein: the conductive agent is one or a combination of acetylene black, conductive carbon black, carbon fibers, carbon nanotubes, graphene and the like.
7. The lithium ion battery negative electrode slurry of claim 1, wherein: the first dispersing agent is sodium carboxymethylcellulose, the binder is styrene butadiene rubber, and the mass percentage of the negative active material, the first dispersing agent, the second dispersing agent, the binder and the conductive agent is 98.5%: 0.3%: 0.3%: 0.7%: 0.2 percent, wherein the solid content of the slurry body in the lithium ion battery cathode slurry is 55 percent.
8. The lithium ion battery negative electrode slurry of claim 1, wherein: the first dispersing agent is sodium carboxymethylcellulose, the binder is styrene butadiene rubber, and the mass percentage of the negative active material, the first dispersing agent, the second dispersing agent, the binder and the conductive agent is 97.8%: 0.5%: 0.1%: 1.4%: 0.2 percent, and the solid content of the slurry body in the lithium ion battery cathode slurry is 60 percent.
9. A preparation method of a lithium ion battery is characterized by comprising the following steps:
providing a copper foil current collector and the lithium ion battery negative electrode slurry of any one of claims 1-8;
coating the lithium ion battery negative electrode slurry on the copper foil current collector;
sequentially carrying out coating, baking, rolling and flaking treatment on the copper foil current collector, and after testing the stripping force of a pole piece diaphragm, winding and injecting liquid on the copper foil current collector, a positive pole piece and a diaphragm to obtain a semi-finished lithium ion battery;
carrying out formation full charge treatment on the semi-finished lithium ion battery to obtain a cylindrical lithium ion battery;
and testing the lithium ion battery.
10. A lithium ion battery, characterized by: prepared by the method of preparing a lithium ion battery according to claim 9.
CN202111129721.9A 2021-09-26 2021-09-26 Lithium ion battery negative electrode slurry, lithium ion battery preparation method and lithium ion battery Pending CN113782729A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114976011A (en) * 2022-06-21 2022-08-30 深圳名飞远科技有限公司 Preparation method of lithium ion battery negative electrode slurry and negative electrode plate
CN114976011B (en) * 2022-06-21 2024-03-15 东莞市众尚源科技有限公司 Preparation method of lithium ion battery negative electrode slurry and negative electrode plate

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Application publication date: 20211210