Abrasive and coating slurry of lithium-ion power battery diaphragm and preparation methods thereof

Abstract

The invention provides an abrasive and coating slurry of a lithium-ion power battery diaphragm and preparation methods thereof. The coating slurry comprises 10-25% of chemical binder, 1-3% of thickening agent, 25-55% of abrasive slurry, 0.1-0.3% of defoaming agent, 0.1-0.3% of wetting agent, 0.1-0.3% of dispersing agent and 0.1-0.3% of levelling agent by w / w. The abrasive, the coating slurry and the preparation methods have the beneficial effects that the costs of the abrasive slurry and the coating slurry can be greatly reduced by adopting barium sulfate which is low in price and rich in resources and is prepared by a precipitation method as a main raw material of the abrasive slurry or the coating slurry; relative to lithium-ion power battery diaphragms disclosed by the prior art, silicon carbide is used instead of aluminium oxide and can not carry out chemical reaction with lithium iron phosphate in positive plates of lithium batteries after being prepared into batteries, and trilithium aluminate (Li3AlO3) can not be generated; therefore the problem of puncture of the diaphragm does not exist in a battery using process, so that the safety of a lithium battery can be improved, and the service life of the lithium battery can be prolonged.

Description

technical field [0001] The invention relates to a grinding material, a coating slurry and a preparation method thereof for a separator film of a lithium ion power battery. Background technique [0002] The power battery is the power source that provides the power source for the tool, and mostly refers to the battery that provides power for electric vehicles, electric trains, electric bicycles, and golf carts. Vehicles that use power batteries as energy sources are also called new energy vehicles. New energy vehicles are favored due to their energy-saving and environmental protection features, but the biggest problem facing their industrialization is the high sales price. From the perspective of foreign hybrid vehicles, the price difference between hybrid vehicles of the same type and fuel vehicles reaches 80,000 to 100,000 yuan, while the price difference between domestic pure electric vehicles and fuel vehicles of the same type is as high as more than 200,000 yuan. Altho...

AI Technical Summary

Problems solved by technology

However, although this battery separator has a certain price advantage, it still has certain hidden dangers in terms of safety.

This is because the coating slurry in this document contains Al2O3, and after Al2O3 is made into a battery, it will chemically react with the lithium iron phosphate in the positive electrode sheet of the lithium battery to generate trilithium aluminate ( Li3AlO3), and trilithium aluminate is a spinel structure, in the process of battery use, it is easy to pierce the separator, resulting in positive and negative lithium batteries The short circuit of the negative electrode will shorten the service life of the lithium battery, and cause the lithium battery to heat up and cause the battery to explode.

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