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Lithium battery positive electrode film-forming additive and preparation method

A cathode film formation and additive technology, which is applied in battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc., can solve the problems of poor thermal stability, insufficient safety, poor cycle performance, etc. Simple, low-cost effects

Active Publication Date: 2017-03-22
江苏智泰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

[0007] In view of the poor thermal stability of positive electrode materials commonly found in the field of lithium-ion secondary batteries, and the easy formation of gaseous films on the surface, the dissolution of ions is inhibited during the subsequent charge and discharge process, resulting in poor cycle performance at room temperature or high temperature, low battery life, and safety. Insufficient performance and other problems, the present invention provides a positive electrode film-forming additive for lithium batteries, which can effectively inhibit the reaction between the positive electrode material and the organic electrolyte, thereby preventing the attenuation, loss and gas generation of the positive electrode active material, and improving the active material of the positive electrode material. Stability during battery cycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Fully mix and disperse high-purity silicon, polyacrylamide, urea, and surfactants (isopropanol, glycerol, and chloroform) in a high-speed mixer at a speed of 800 rpm for 15 minutes to obtain a premix; The sum of the mass is based on 100% mass fraction, and the component numbers of each raw material are: the mass fraction of high-purity silicon is 55%, the mass fraction of polyacrylamide is 22%, the mass fraction of surfactant is 8%, urea The mass fraction is 15%. The obtained premix is ​​mixed with spherical corundum grinding sand at a ratio of 4:1, and then added to the grinding tank of the high-speed planetary grinder, and the grinding tank is vacuum-sealed before grinding. Adjust the rotation speed of the main disk to rotate at 250rpm, high-speed grinding reaction for 2.5h, after the reaction is completed, pass the obtained particles and the frosted mixture through a sub-sieve to remove the abrasives and coarse particles with a particle size > 0.1 μm to obtain amidat...

Embodiment 2

[0028] High-purity silicon, polyacrylamide, urea, and surfactants (50% glycerol and 50% chloroform) were fully mixed and dispersed for 15 minutes at a speed of 1000 rpm in a high-speed mixer to obtain a premix; The sum of the mass is based on 100% mass fraction, and the component numbers of each raw material are: the mass fraction of high-purity silicon is 10%, the mass fraction of polyacrylamide is 12%, the mass fraction of surfactant is 8%, urea The quality score is 70%. The obtained premix is ​​mixed with spherical corundum grinding sand at a ratio of 1:1, and then added to the grinding tank of the high-speed planetary grinder, and the grinding tank is vacuum-sealed before grinding. Adjust the rotation speed of the main disk to rotate at 550rpm, high-speed grinding reaction for 5.5h, after the reaction is completed, pass the obtained particles and the frosted mixture through a sieve to remove the abrasives and coarse particles with a particle size > 0.1 μm to obtain amidate...

Embodiment 3

[0031] Melt high-purity silicon, polyacrylamide, urea, and surfactant (50% each of isopropanol and furan), and then fully mix and disperse them in a high-speed mixer at a speed of 600 rpm for 25 minutes to obtain a premix; The sum of the mass of the mixture is based on 100% mass fraction, then the component numbers of each raw material are: the mass fraction of high-purity silicon is 50%, the mass fraction of polyacrylamide is 15%, and the mass fraction of surfactant is 5%. %, the mass fraction of urea is 30%; after mixing the obtained premix with spherical corundum grinding sand at a ratio of 2:1, add it to the grinding tank of the high-speed planetary grinder, and the grinding tank is vacuum-sealed Grind. Adjust the rotation speed of the main disk to rotate at 450rpm, high-speed grinding reaction for 2.5h, after the reaction is completed, pass the obtained particles and the frosted mixture through a sieve to remove the abrasives and coarse particles with a particle size > 0....

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Abstract

The invention provides a lithium battery positive electrode film-forming additive. Coated and amidated nano high-purity silicon is used for a lithium battery positive electrode, so that a reaction between a positive electrode material and an organic electrolyte can be effectively suppressed so as to prevent positive electrode active material attenuation, loss and generation of gas, and to improve stability of the positive electrode active material in the battery circulation process. The invention further provides a preparation method; the high-purity silicon, polyacrylamide, urea, and a surfactant are grinded to coat the amidated nano high-purity silicon granules to be used as the lithium battery positive electrode film-forming additive. The additive has high dispersity in the positive electrode material of the lithium battery.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to the improvement of positive electrode materials for lithium ion secondary batteries, in particular to an additive for positive electrode materials of lithium ion secondary batteries. Background technique [0002] The concept of lithium-ion rechargeable batteries was first proposed by Armand in the 1980s. The positive and negative electrode materials of the battery are materials that can store and exchange ions, and use the back and forth migration of ions to perform energy exchange during charging and discharging. With the increasingly prominent energy crisis and environmental pollution, the hybrid electric vehicle market is showing a momentum of vigorous development, which requires the battery to have the performance characteristics of large discharge current and high power. In addition, some electric tools, aircraft models and other electronic products also require batteries to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/42H01M10/0525
CPCH01M4/62H01M10/0525H01M10/4235Y02E60/10
Inventor 陈庆曾军堂王镭迪
Owner 江苏智泰新能源科技有限公司