Unlock instant, AI-driven research and patent intelligence for your innovation.

Positive electrode slurry of lithium iron phosphate battery, and preparation method thereof

A technology of lithium iron phosphate battery and positive electrode slurry, which is applied in the direction of battery electrodes, lithium batteries, positive electrodes, etc., can solve the problems of poor slurry stability, low stability, and prone to sedimentation, so as to improve stability and alleviate Volume shrinkage and expansion, the effect of improving electrochemical performance

Active Publication Date: 2021-03-02
江苏同科蓄电池股份有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent document CN103943851A discloses a lithium iron phosphate water-based positive electrode slurry, which solves the problem that the solid matter in the prior art lithium iron phosphate water-based positive electrode slurry is not easy to uniformly disperse, and the consistency and stability of the aqueous positive electrode slurry are poor. It is composed of the following components in mass percentage: 45-50% of lithium iron phosphate, 2-3% of conductive agent, 2-3% of water-based binder, 3-5% of ethanol, and the balance for deionized water
[0007] The positive electrode slurry of the current lithium iron phosphate battery still has the problem of poor slurry stability. The inventor believes that one of the reasons is that the selection of the binder

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A positive electrode slurry for a lithium iron phosphate battery, consisting of the following components in parts by weight: 90 parts of positive electrode active material, 4 parts of conductive agent, 5 parts of binder, 3 parts of dispersant and 80 parts of solvent; wherein the positive electrode The active material is lithium iron phosphate, the binder is polyacrylic acid and polyglutamic acid, and the weight ratio of polyacrylic acid and polyglutamic acid is 1:0.5.

[0028] The dispersant is tartrate, and the tartrate is selected from sodium tartrate, the solvent is deionized water, and the conductive agent is graphene.

[0029] The preparation method of the positive electrode slurry of this lithium iron phosphate battery comprises the steps:

[0030] (1) Add the binder, dispersant and solvent into the mixing tank according to the proportion, set the stirring speed to 200 rpm, and stir for 30 minutes;

[0031] (2) Add the positive electrode active material and the c...

Embodiment 2

[0036] Referring to Example 1, the difference from Example 1 is that the positive electrode slurry of a lithium iron phosphate battery in this embodiment consists of the following components in parts by weight: 92 parts of positive electrode active material, 5 parts of conductive agent, 6 parts of binder, 4 parts of dispersant and 85 parts of solvent; wherein the binder is polyacrylic acid and polyglutamic acid, and the weight ratio of polyacrylic acid and polyglutamic acid is 1:0.8.

Embodiment 3

[0038] Referring to Example 1, the difference from Example 1 is that the positive electrode slurry of a lithium iron phosphate battery in this embodiment consists of the following components in parts by weight: 95 parts of positive electrode active material, 6 parts of conductive agent, 7 parts of binder, 5 parts of dispersant and 90 parts of solvent; wherein the binder is polyacrylic acid and polyglutamic acid, and the weight ratio of polyacrylic acid and polyglutamic acid is 1:1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses positive electrode slurry of a lithium iron phosphate battery, and a preparation method thereof. The positive electrode slurry of the lithium iron phosphate battery is preparedfrom, by weight, 90-95 parts of a positive electrode active material, 4-6 parts of a conductive agent, 5-7 parts of a binder, 3-5 parts of a dispersing agent and 80-90 parts of a solvent, wherein thepositive electrode active material is lithium iron phosphate, the binder is polyacrylic acid and polyglutamic acid, and the weight ratio of polyacrylic acid to polyglutamic acid is 1: (0.5-1). The stability of the slurry can be synergistically improved, and finally the electrochemical performance of the lithium iron phosphate battery is synergistically improved.

Description

technical field [0001] The invention relates to the field of lithium iron phosphate batteries, in particular to a positive electrode slurry for a lithium iron phosphate battery and a preparation method thereof. Background technique [0002] The preparation of lithium iron phosphate cathode slurry mainly includes two homogenization methods: oily system and watery system. The oily system uses the organic solvent NMP (N-methylpyrrolidone) as the solvent. NMP has the disadvantages of high toxicity, high price, and difficult recovery. The homogenization technology of the water-based system uses deionized water as the solvent, and the production process is more environmentally friendly and the cost is lower. However, the traditional water-based slurry has poor fluidity, is not easy to disperse, and the electrode sheet is not flexible enough to be wound. It can only be laminated, and the production efficiency is low. In addition, there is a certain gap in electrical performance co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/136H01M10/052H01M10/0525
CPCH01M4/5825H01M4/62H01M4/622H01M4/625H01M4/136H01M10/052H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 钦建峰
Owner 江苏同科蓄电池股份有限公司