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Method for preparation of electrode slurry

An electrode slurry and electrode active material technology, applied in electrode manufacturing, battery electrodes, active material electrodes, etc., can solve the problems of unstable discharge platform and cycle internal resistance, poor battery specific capacity, and slow capacity decay. Achieve the effect of stable discharge platform and cycle internal resistance, slow capacity decay, and improved stability

Inactive Publication Date: 2008-06-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the electrode slurry prepared in the prior art, such as poor battery specific capacity, fast capacity fading, unstable discharge platform and cycle internal resistance, and large amount of organic solvent, to provide an electrode that can be obtained The slurry can make the specific capacity of the battery play well, the capacity decay speed is slow, the discharge platform and cycle internal resistance are stable, and the preparation method of the electrode slurry with a small amount of organic solvent

Method used

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  • Method for preparation of electrode slurry

Examples

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Effect test

Embodiment 1

[0030] This example is used to illustrate the preparation method of the electrode slurry provided by the present invention.

[0031] 1. Mix 22 parts by weight of N-methyl-2-pyrrolidone with 3 parts by weight of polyvinylidene fluoride (7200#, Japan Kureha Chemical Industry Co., Ltd.), and mechanically disperse until completely dissolved at a speed of 250 rpm to obtain viscous binder solution;

[0032] 2. Get 0.03 parts by weight of PVP (Boai Xinlianyou Chemical Industry, K17) dispersant with a degree of polymerization of 72 and 0.03 parts by weight of a PVP (Boai Xinlianyou Chemical Industry, K90) stabilizer with a degree of polymerization of 10000 to dissolve in 18 parts by weight In the N-methyl-2-pyrrolidone (Shanghai Jiachen Chemical Industry), add 3 parts by weight of acetylene black conductive agent (specific surface area 1800 square meters / gram), first carry out primary stirring with the speed of 300 rpm, stirring The time is 15 minutes; then carry out secondary stir...

Embodiment 2

[0037] This example is used to illustrate the preparation method of the electrode slurry provided by the present invention.

[0038] Same as Example 1, the difference is that the preparation of the conductive agent dispersion is that 0.3 parts by weight of the PVP (Boai Xinlianyou Chemical Industry, K17) dispersant with a degree of polymerization of 72 and 0.3 parts by weight of the PVP with a degree of polymerization of 10000 (Boai Xinlianyou Chemical Industry, K90) stabilizer is dissolved in 18 parts by weight of N-methyl-2-pyrrolidone (Shanghai Jiachen Chemical Industry), and 3 parts by weight of acetylene black conductive agent (specific surface area 2200 square meters / gram) , firstly perform primary stirring at a rate of 300 rpm for 15 minutes; then perform secondary stirring at a rate of 2200 rpm for 30 minutes. Prepare positive electrode slurry.

Embodiment 3

[0040] This example is used to illustrate the preparation method of the electrode slurry provided by the present invention.

[0041] Same as Example 1, the difference is that the preparation of the conductive agent dispersion is that 0.6 parts by weight of the PVP (Boai Xinlianyou Chemical Industry, K17) dispersant with a degree of polymerization of 72 and 0.6 parts by weight of the PVP with a degree of polymerization of 10000 (Boai Xinlianyou Chemical Industry, K90) stabilizer is dissolved in 18 parts by weight of N-methyl-2-pyrrolidone (Shanghai Jiachen Chemical Industry), and 3 parts by weight of acetylene black conductive agent (specific surface area 2500 square meters / gram) , firstly perform primary stirring at a rate of 300 rpm for 15 minutes; then perform secondary stirring at a rate of 2200 rpm for 30 minutes. Prepare positive electrode slurry.

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Abstract

The invention relates to a preparation method of electrode pulp, which comprises the step that binding agent, conductive agent and dissolvent are mixed and agitated evenly. The invention is characterized in that the conductive agent is mixed with the binding agent, electrode active material and the dissolvent in the form of conductive agent dispersion, the conductive agent dispersion includes the conductive agent, conducting dispersing medium, dispersant and stabilizer, the dispersant is chosen from one or more of polyacrylamide, polyvinylpyrrolidone, hydroxy ethyl cellulose, polyacrylic ester, dodecyl polyethylene oxide ester, polycaprolactone and alkyl acid and the stabilizer is chosen from on or more of polyvinylidene fluoride, polyfluortetraethylene, polyacrylamide, polyvinylpyrrolidone, methylol cellulose, droxyethylcellulose and polyacrylic ester. The battery which is prepared by utilizing the method provided by the invention has the advantages that the battery capacity is high, the discharging platform is stable, the circulation is good, and the internal resistance change is little; and simultaneously, the invention overcomes the disadvantages that the using quantity of organic solvent is large, the cost is high and the pollution to the environment is large when the pulp is prepared in the prior art.

Description

technical field [0001] The invention relates to a preparation method of electrode slurry. Background technique [0002] As a secondary battery for green energy, lithium-ion secondary batteries are widely used in mobile communications, motors, etc. Vehicles, aerospace and national defense and military fields. [0003] While lithium-ion secondary batteries are widely used as energy sources for various electronic devices. People's requirements for battery performance are getting higher and higher. Whether it is a circular lithium-ion secondary battery with a higher capacity or a square lithium-ion secondary battery suitable for various electronic products, it is required to have a higher capacity, and These batteries are also required to have a good capacity retention rate during repeated charging and discharging, exhibit good cycle performance, and have a long service life. [0004] For increasing the battery capacity, there are usually two methods: one is to increase the s...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M4/02
CPCY02E60/10
Inventor 吴声本姜占锋肖峰
Owner BYD CO LTD
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