Method for manufacturing and coating anode slurry of lithium iron phosphate battery

A technology of lithium iron phosphate battery and positive electrode slurry, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of difficult adhesion, easy falling off, and cracking of lithium iron phosphate batteries, and achieves good adhesion and dispersion. The effect of uniform and improved adhesion

Active Publication Date: 2012-07-11
HANGZHOU LIAO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of difficult bonding, easy falling off, material dropping and cracking in the positive electrode slurry of the existing lithium iron phosphate battery, and to provide a binder capable of uniformly dispersing the components in the slurry. Production and coating method of lithium iron phosphate battery positive electrode slurry with less usage, high compaction density of pole pieces, high volume specific capacity, good rate discharge performance, and long cycle life

Method used

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  • Method for manufacturing and coating anode slurry of lithium iron phosphate battery
  • Method for manufacturing and coating anode slurry of lithium iron phosphate battery
  • Method for manufacturing and coating anode slurry of lithium iron phosphate battery

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1. Follow the steps below for slurry preparation

[0037] According to the mass ratio: 93% lithium iron phosphate: 3% conductive carbon black (SP): 1% conductive graphite (KS6): 3% Solef5130 Weigh each raw material; first put each raw material into a 120°C vacuum oven to dry for 4 hours, the vacuum is -0.1MPa; then the binder (solef PVDF 5130 from the United States) and the organic solvent are stirred in vacuum for 4 hours, and the vacuum is: -0.1MPa; then conductive carbon black (SP) and conductive graphite ( KS6) Two mixed conductive agents are added to the adhesive, stirred in vacuum for 1 hour, and the vacuum degree is: -0.1MPa; then lithium iron phosphate is added to the conductive adhesive, vacuumed to -0.1MPa, and filled with high-purity gas , the vacuum degree was maintained at -0.08MPa, and stirred for 6 hours; finally, the slurry was filtered with a 120 sieve.

[0038] The organic solvent of the present embodiment is ethanol, and its weight is 8 times of the ...

Embodiment 2

[0043] Similar to Example 1, the difference is that the slurry is prepared according to the mass ratio: 94% lithium iron phosphate: 2% SP: 1% VGCF: 3% Solef5130.

[0044] Processing method is as embodiment 1.

Embodiment 3

[0046] Similar to Example 1, the difference is that lithium iron phosphate is added to the conductive adhesive, vacuumed to -0.1MPa, filled with high-purity gas, and kept at a vacuum of -0.06MPa, and stirred for 7 hours.

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Abstract

The invention relates to a method for manufacturing and coating anode slurry of a lithium iron phosphate battery. In the process of manufacturing the anode slurry of the lithium iron phosphate battery, a stirring process is carried out in the protection of a high-purity gas; the formulation of the anode slurry comprises the following components in mass percentage: 90-96 percent of lithium iron phosphate, 2-4 percent of conductive agent and 2.5-5 percent of binding agent; in the coating process, the anode slurry is coated on a current collector by several times, so that the adhesion between the anode slurry and the current collector is better and the compacted density is higher; and the binding agent is polyvinylidene fluoride (American Solef5130) with a high molecular weight. The lithium iron phosphate slurry is more uniformly dispersed; the adhesion between powder and the current collector is better; the ratio discharge performance is good; and the circulating performance is good.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium iron phosphate batteries, in particular to a method for making and coating positive electrode slurry for lithium iron phosphate batteries. Background technique [0002] In the 1990s, Sony Corporation of Japan (SONY) successfully developed lithium-ion batteries and commercialized them. Lithium-ion batteries have been developed rapidly due to their light weight, large volume specific capacity, high voltage, and long cycle life. At present, LiCoO is mainly used as the positive electrode material of lithium-ion batteries. 2 , LiMnO4 and Li(NiCoMn) 1 o 2 Ternary system materials, these materials have some defects due to each, such as LiCoO 2 Cobalt resources are scarce, expensive and toxic to a certain extent, Li(NiCoMn) 1 o 2 , LiMnO4 high temperature performance is poor, and other reasons restrict their development. [0003] LiFePO 4 With the advantages of extensive resources, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/62
CPCY02E60/122Y02E60/10
Inventor 黄镇财
Owner HANGZHOU LIAO TECH
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