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Positive electrode slurry of water-based lithium iron phosphate battery and preparation method of positive electrode slurry

A lithium iron phosphate battery and positive electrode slurry technology, which is applied in the direction of electrode manufacturing, battery electrodes, active material electrodes, etc., can solve the problems of electrode cracking and powder loss, poor slurry stability, and poor flexibility of positive electrodes.

Active Publication Date: 2020-12-25
江西安驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In summary, the current positive electrode slurry of water-based lithium iron phosphate batteries still has the following problems: 1. Poor stability of the slurry; 2. The electrode sheet cracks and loses powder during coating; 3. The flexibility of the positive electrode sheet is poor.

Method used

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  • Positive electrode slurry of water-based lithium iron phosphate battery and preparation method of positive electrode slurry

Examples

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Embodiment 1

[0043] A positive electrode slurry for an aqueous lithium iron phosphate battery, comprising a positive electrode active material, a conductive agent and a binding agent, the binding agent comprising a binding agent A and a binding agent B, by weight, the positive electrode active material: viscose Bonding agent A: binder B: conductive agent = 93:1:3:3;

[0044] The positive electrode active material is lithium iron phosphate; the main chain of the binder A is polyethylene glycol, and the branch chain is acrylate; the binder B is a copolymer of acrylic acid and acrylonitrile. Tougheners were also added to Binder B. The toughening agent is polymethyl methacrylate.

[0045]A method for preparing lithium iron phosphate, comprising: respectively providing a lithium source solution, a ferrous source solution, and a phosphorus source solution, wherein the lithium source solution, the ferrous source solution, and the phosphorus source solution are respectively a lithium source compo...

Embodiment 2

[0056] Referring to Example 1, different from Example 1, the lithium source for preparing aqueous lithium iron phosphate comes from a mixture of lithium carbonate and lithium hydroxide; the weight ratio of lithium carbonate and lithium hydroxide is 70:30. Tougheners were also added to Binder B. The toughening agent is polypropylene butyl ester.

Embodiment 3

[0058] Referring to Example 1, different from Example 1, the lithium source for preparing aqueous lithium iron phosphate comes from a mixture of lithium carbonate and lithium hydroxide; the weight ratio of lithium carbonate and lithium hydroxide is 80:40. Tougheners were also added to Binder B. The toughening agent is a mixture of polymethyl methacrylate and polypropylene butyl.

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Abstract

The invention discloses positive electrode slurry of a water-based lithium iron phosphate battery and a preparation method of the positive electrode slurry. The positive electrode slurry comprises a positive electrode active material, a conductive agent and a binder, wherein the binder comprises a binder A and a binder B, and the weight ratio of the positive electrode active material to the binderA to the binder B to the conductive agent is (90-95): (1-3): (2-5): (2-5); the positive electrode active material is lithium iron phosphate; the main chain of the binder A is polyethylene glycol, andthe branched chain of the binder A is acrylate; and the binder B is a copolymer of acrylic acid and acrylonitrile. The slurry stability can be improved, the flexibility of a pole piece is improved, and the problems of cracking and powder falling of the pole piece are solved.

Description

technical field [0001] The invention relates to the field of lithium iron phosphate batteries, in particular to a positive electrode slurry for an aqueous lithium iron phosphate battery and a preparation method thereof. Background technique [0002] Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as the positive electrode material. In the large-scale production of the lithium iron phosphate battery industry, an organic solvent-based binder system is generally used, and polyvinylidene fluoride (PVDF) with a crystallinity of 50% is used as the binder, and the highly polar compound NMP ( N-methylpyrrolidone) as a dispersing solvent. It has the following disadvantages: [0003] (1) Although the organic solvent NMP has good dispersibility, it is volatile, flammable, explosive, and highly toxic; the volatilization of the organic solvent seriously pollutes the environment, makes the production site highly toxic, and seriously affect...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M4/136H01M4/04H01M10/0525
CPCH01M4/0404H01M4/136H01M4/5825H01M4/622H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 郭娜娜何涛斌毛振强汪正兵张小溪
Owner 江西安驰新能源科技有限公司
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