Lithium ion battery negative electrode slurry as well as preparation method and application thereof

A technology of lithium ion battery and negative electrode slurry, which is applied in the field of lithium ion battery, can solve the problems of insufficient mixing of polyvinylidene fluoride, limited surface tension of solvent, strong special type of negative electrode material, etc., and achieves increased adhesion and electrical performance. Improve and reduce the effect of agglomeration

Inactive Publication Date: 2020-04-24
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN107834023A discloses a water-based negative electrode slurry. By adding low-polarity ethylene carbonate, the dispersibility of the negative electrode active material and the conductive agent in deionized water is effectively adjusted, so that the components of the slurry are evenly dispersed, reducing particle agglomeration or even There is no particle agglomeration phenomenon, but this method is very limited to reduce the surface tension of the solvent, and is sensitive to the dispersion process, and it is too strong for the special type of negative el

Method used

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  • Lithium ion battery negative electrode slurry as well as preparation method and application thereof
  • Lithium ion battery negative electrode slurry as well as preparation method and application thereof
  • Lithium ion battery negative electrode slurry as well as preparation method and application thereof

Examples

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Example Embodiment

[0064] Example 1

[0065] The negative electrode slurry described in this embodiment comprises the following components in parts by weight:

[0066]

[0067]

[0068] Wherein, the negative electrode active material is composed of hard carbon and graphite with a mass ratio of 1:1;

[0069] The conductive agent is SP; the surfactant is EC, the additive is oxalic acid, the binder is polyvinylidene fluoride, and the solvent is N-methylpyrrolidone;

[0070] The preparation method of negative electrode slurry described in this embodiment comprises the following steps:

[0071] (1) Glue making: Mix 5 parts of binder and 57.5 parts of solvent, stir for 3 hours at a linear speed of 8 m / s to obtain glue, and leave it to stand for use;

[0072] (2) Mixing: 87 parts of negative electrode active material, 5 parts of conductive agent and 2 parts of surfactant were mixed, and the mixture was mixed for 2 hours under the condition that the line speed was 1m / s to obtain the mixed materi...

Example Embodiment

[0080] Example 2

[0081] The negative electrode slurry described in this embodiment comprises the following components in parts by weight:

[0082]

[0083] Among them, the negative electrode active material is composed of hard carbon, graphite and soft carbon with a mass ratio of 2:1:1; the conductive agent is graphene; the surfactant is DEC, the additive is citric acid, the binder is polyvinylidene fluoride, and the solvent Is N-methylpyrrolidone;

[0084] The preparation method of negative electrode slurry described in this embodiment comprises the following steps:

[0085] (1) Glue making: Mix 4.4 parts of binder and 50.6 parts of solvent, stir for 3 hours at a linear speed of 10 m / s to obtain glue, and leave it to stand for use;

[0086] (2) Mixing: 92.5 parts of negative electrode active material, 0.1 part of conductive agent and 2 parts of surfactant were mixed, and the mixture was mixed for 2 hours under the condition that the linear speed was 1m / s to obtain the ...

Example Embodiment

[0094] Example 3

[0095] The negative electrode slurry described in this embodiment comprises the following components in parts by weight:

[0096]

[0097] Among them, the negative electrode active material is composed of graphite; the conductive agent is a mixture of graphene and KS-6 with a mass ratio of 1:1; the surfactant is a mixture of EC and DEC with a mass ratio of 1:1, and the additive is composed of It is made of 1:1 mixture of oxalic acid and citric acid, the binder is polyvinylidene fluoride, and the solvent is N-methylpyrrolidone;

[0098] The preparation method of negative electrode slurry described in this embodiment comprises the following steps:

[0099] (1) Glue making: Mix 3 parts of binder and 34.5 parts of solvent, stir for 3 hours at a linear speed of 8m / s to obtain glue, and let it stand for use;

[0100] (2) Mixing: 90 parts of negative electrode active material, 5 parts of conductive agent and 1 part of surfactant were mixed, and the mixture was m...

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Abstract

The invention relates to lithium ion battery negative electrode slurry as well as a preparation method and application thereof. According to the lithium ion battery negative electrode slurry, a specific raw material ratio is adopted, any one or a combination of at least two of N-methyl pyrrolidone, N, N-dimethylformamide and acetamide is adopted as a solvent, and oxalic acid and/or citric acid is/are adopted as an additive; the moisture content of a negative pole piece prepared from the slurry is extremely low; after a battery is assembled, the internal moisture content of the battery is reduced, so that the decomposition of LiPF6 in electrolyte is reduced; meanwhile, by adopting the negative electrode slurry disclosed by the invention, the bonding strength between a negative electrode active substance and a copper foil can be improved, so that the electrical property of the lithium ion battery after high-temperature storage is improved; and the preparation process of the lithium ion battery negative electrode slurry has a large preparation process window, and hard carbon, graphite, lithium titanate or soft carbon can be adopted as a negative electrode active substance.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery negative electrode slurry, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, electric vehicles and other fields due to their high operating voltage, wide operating temperature range and environmental friendliness. With the development of technology, in order to meet some special use environments, such as military industry or extreme high temperature environment, the battery will be required to withstand the high temperature environment or cycle of 80 ~ 100 ℃, which requires the battery to have higher high temperature resistance storage capacity and high temperature resistance cycle capacity. [0003] When lithium-ion batteries are stored at high temperatures, the presence of moisture will accelerate LiPF 6 The decomposition of lithium-ion batteries degrades the high-t...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/583H01M4/485H01M4/13H01M4/04H01M10/0525
CPCH01M4/0404H01M4/13H01M4/485H01M4/583H01M4/62H01M4/622H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 张章明陆杭烁潘凌波曹嘉慧陈德军
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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