Preparation method of lithium ion battery anode slurry

A lithium-ion battery and positive electrode slurry technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor dispersion effect, unsatisfactory slurry consistency, and slow molecular diffusion, and achieve excellent consistency.

Active Publication Date: 2012-03-07
奇瑞新能源汽车股份有限公司
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Problems solved by technology

During the production process of the traditional slurry mixing process, the whole system is at a relatively low temperature. In this low temperature state, the molecular diffusion of the positive electrode material, PVDF, conductive agent (SP or CNT), sol

Method used

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Experimental program
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Effect test

Embodiment 1

[0023] The lithium ion battery positive electrode slurry of the present embodiment is mixed by N-methylpyrrolidone as solvent, polyvinylidene fluoride, conductive carbon black as conductive agent, lithium iron phosphate positive electrode material, polyvinylidene fluoride, conductive agent, The weight ratio of lithium iron phosphate positive electrode material is polyvinylidene fluoride: conductive agent: lithium iron phosphate positive electrode material = 4%: 4%: 92%, solvent quality: solid material quality = 50%, and the solid material quality is polyvinylidene fluoride The total mass of vinylidene fluoride, conductive agent and lithium iron phosphate cathode material.

[0024] The key to the preparation method of the lithium ion battery positive electrode slurry in this embodiment is that the solvent, polyvinylidene fluoride, conductive agent, and lithium iron phosphate positive electrode material are stirred evenly in a temperature environment of 65°C to 70°C to make lithi...

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Abstract

The invention provides a preparation method of lithium ion battery anode slurry with which effective control can be taken upon the consistency of a lithium ion battery in a micro perspective. The lithium ion battery anode slurry is prepared from mixed materials of a solvent, polyvinylidene difluoride, a conductive agent, and a lithium iron phosphate anode material. The preparation method comprises steps that: the solvent, polyvinylidene difluoride, the conductive agent, and the lithium iron phosphate anode material are well mixed under a temperature environment of 65 to 70 DEG C, such that the lithium ion battery anode slurry is prepared. According to the invention, during the whole slurry preparation procedure, the whole slurry system is maintained to be in a constant high temperature; with a method wherein the raw materials and the solvent are added to the slurry system in batches, the viscosity of the slurry system is controlled within a certain range; before a bonding agent is added, all solid powders are premixed by using the solvent, such that the components of the slurry are subject to more severe molecular motions under a temperature higher than that of a common slurry mixing technology. Therefore, electrode slurry with a better consistency in the micro perspective is obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a preparation method of a positive electrode slurry of a lithium ion battery. Background technique [0002] Electric vehicles have the characteristics of low carbon and environmental protection, and are the future development direction of automobiles. With the development of electric vehicle technology, automobile manufacturers have increasingly urgent requirements for improving the performance of lithium-ion power batteries used in electric vehicles. The consistency of lithium-ion power batteries used in electric vehicles is the biggest bottleneck restricting the development of the entire electric vehicle technology. [0003] At present, the methods to solve the consistency of the single battery mainly focus on the following methods: 1. Use a high-precision coating machine to improve the consistency of the amount of coating in the horizonta...

Claims

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Application Information

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IPC IPC(8): H01M4/139
CPCY02E60/10
Inventor 翟冬
Owner 奇瑞新能源汽车股份有限公司
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