Negative electrode, preparation method therefor, and application thereof
AssigneeSvolt Energy Technology Co., Ltd.
InventorsYang Dou, Shuaibin Lou, Jing Liu
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Abstract
The present disclosure provides a negative electrode, a preparation method therefor, and an application thereof. In the process of preparing a negative electrode of the present disclosure, a graphite material is mixed with a graphene-coated silicon-oxygen material, and the graphene-coated silicon-oxygen material is prepared by means of spray drying. The present disclosure not only uses the advantages of graphite in cycle life and low-temperature capacity retention, but also makes full use of the advantages of the silicon-oxygen material, thereby reducing the areal density and compaction density of a negative electrode, thereby significantly improving the cycle life of a battery.
Claims13
A preparation method of a negative electrode, comprising
- mixing a first negative active material, a second negative active material, a conductive agent, a binder and a solvent to obtain negative electrode slurry, and coating the negative electrode slurry on the surface of a current collector to obtain the negative electrode;
- wherein the first negative active material comprises graphite, and the second negative active material comprises a graphene-coated silicon-oxygen material, and the chemical formula of the silicon-oxygen material is SiOx, 0<x<2;
- a preparation method of the graphene-coated silicon-oxygen material comprises
- subjecting a silicon-oxygen material and a solvent to a primary mixing, then adding graphene slurry, performing a secondary mixing, and then performing spray-drying to obtain the graphene-coated silicon-oxygen material;
- wherein a mass proportion of the second negative active material is 1-3% based on the total mass of the first negative active material and the second negative active material being 100%.
Dependencies are inferred from the claim text.