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Dispersing agent, positive electrode slurry and lithium ion battery

A technology of positive electrode slurry and dispersant, applied in the field of dispersant, positive electrode slurry and lithium ion battery, can solve the problems affecting production efficiency, material agglomeration, slurry gel, etc., to reduce the phenomenon of material gelation and agglomeration, The effect of reducing slurry viscosity and improving dispersibility

Active Publication Date: 2021-10-22
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low conductivity of lithium iron phosphate itself, a large amount of conductive agent carbon black needs to be added to be used in batteries, and the specific surface area of ​​lithium iron phosphate material and carbon black is large, and it is often caused by van der Waals force during the homogenization process. If it is too large, it will lead to material agglomeration, slurry gel and other phenomena, which will greatly affect production efficiency

Method used

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  • Dispersing agent, positive electrode slurry and lithium ion battery
  • Dispersing agent, positive electrode slurry and lithium ion battery
  • Dispersing agent, positive electrode slurry and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The preparation of embodiment 1, polyacrylonitrile and polystyrene dispersant

[0059] Set the molecular weight to 10 5 ~10 6 g / mol of polyacrylonitrile and a molecular weight of 10 5 ~10 6 The g / mol polystyrene is mixed according to the mass ratio of 1:1, and added to the NMP solution, so that the polymer mass fraction is 20-40%, and the polyacrylonitrile and polystyrene dispersant are made.

Embodiment 2

[0060] Embodiment 2, the preparation of polyacrylonitrile, polystyrene and polyacrylic acid dispersant

[0061] Set the molecular weight to 10 5 ~10 6 g / mol polyacrylonitrile, molecular weight 10 5 ~10 6 g / mol polystyrene and a molecular weight of 10 3 ~10 4 The g / mol polyacrylic acid is mixed according to the mass ratio of 1:1:1, and added to the NMP solution, so that the polymer mass fraction is 20-40%, and the polyacrylonitrile, polystyrene and polyacrylic acid dispersants are made.

Embodiment 3

[0062] Embodiment 3, the preparation of polyacrylonitrile-styrene dispersant

[0063] Step 1: Preparation of Acrylonitrile and Styrene Copolymer

[0064] Take 60g of acrylonitrile and 104g of styrene purified by vacuum distillation, mix the two in a nitrogen atmosphere, put them into a single-port polymerization bottle containing toluene solvent, polymerize at a constant temperature of 80°C for 8 hours, add an ethanol solution containing hydrochloric acid to terminate the reaction, and obtain The polymer was washed with absolute ethanol and dried under vacuum. Molecular weight and molecular weight distribution test using Tosoh Co., Ltd. gel permeation chromatography, the mobile phase is tetrahydrofuran, and the measured molecular weight of the polymer is 10 6 g / mol.

[0065] Step 2:

[0066] Add the acrylonitrile and styrene copolymer obtained in step 1 into the NMP solution so that the mass fraction of the polymer is 20-40%, and stir in an anhydrous environment for 30-120 ...

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Abstract

The invention discloses a dispersing agent, positive electrode slurry and a lithium ion battery. In the application, the dispersing agent is prepared from polyacrylonitrile and polystyrene; or the dispersing agent comprises a first copolymer, and the first copolymer is formed by copolymerization of an acrylonitrile monomer and a styrene monomer. When the dispersing agent is added into positive electrode slurry, the phenomena of material gelling and agglomeration in the slurry homogenizing process can be reduced, the viscosity of the slurry is reduced, and the stability of the slurry is improved; therefore, the dispersing capacity of the positive electrode material is improved, and the slurry viscosity is reduced.

Description

technical field [0001] The embodiments of the present invention relate to the field of lithium-ion batteries, in particular to dispersants, positive electrode pastes and lithium-ion batteries. Background technique [0002] With the continuous development and progress of lithium-ion batteries, there are higher requirements for lithium-ion battery rate, cycle capacity retention, energy density and other aspects. In addition to the influence of the positive electrode material itself, the formulation of the conductive agent also has a crucial impact on the battery rate, cycle capacity retention, energy density and other aspects. Therefore, optimizing the formulation of conductive agents from the material side has a crucial impact on improving the performance of lithium-ion batteries. [0003] As a cathode material, lithium iron phosphate has the advantages of low price, high safety, and strong battery life. However, due to the low conductivity of lithium iron phosphate itself,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 闫永思孙化雨其他发明人请求不公开姓名
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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