Btr New Material Group Co., Ltd.

Dingyuan New Energy Technology Co., Ltd.

Tengyu Liang

Jianguo Ren

Chunlei Pang

Min Yue

Xueqin He

Jingwei Wang

Yiming Kong

Provided are a composite negative electrode material, a preparation method therefor and a lithium battery. The composite negative electrode material comprises silicon-containing particles and a carbon coating layer coating at least part of the surface of silicon-containing particles. In Raman spectrum, the composite negative electrode material has a silicon characteristic peak A between 450 cm-550 cm, a carbon characteristic peak B between 1300 cm-1400 cm, a carbon characteristic peak C between 1530 cm-1630 cm, and a graphene structure characteristic peak D between 2500 cm-2750 cm. The preparation method comprises: in protective atmosphere, introducing reaction gas to react with silicon-containing particles, the reaction temperature being 700° C.-1450° C., and the reaction gas comprising a carbon-containing gas, so that at least part of the surface of silicon-containing particles form a carbon coating layer, so as to obtain the composite negative electrode material.

Composite negative electrode material and preparation method therefor and lithium battery

A preparation method obtains silicon oxide/carbon composite negative electrode material and a lithium-ion battery. The silicon oxide/carbon composite negative electrode material is a secondary particle, and mainly consists of a SiOx/C material. The SiOx/C material includes SiOx particles and a carbon layer with which the surfaces of the SiOx particles are coated. The SiOx particles include Si crystallites. The preparation method includes: 1) synthesizing a silicon oxide bulk; 2) performing crushing to obtain micro-level or nano-level SiOx particles; 3) mixing with a carbon binder; 4) granulating; 5) modification and carbonization; and 6) post-processing.

Silicon oxide/carbon composite negative electrode material and preparation method therefor, and lithium-ion battery

Disclosed are a lithium ion battery negative electrode material and a preparation method therefor. The negative electrode material comprises SiO(0.2<y<0.9) and an M compound, wherein M is a metal. The method of the present application comprises: subjecting a raw material comprising a SiOmaterial and the metal M to a redox reaction, wherein the O/Si ratio, i.e. x, of the SiO(0.5<x<1.5) material is adjusted to y (0.2<y<0.9), and at the same time, the metal M is oxidized to obtain the M compound.

Lithium ion battery negative electrode material and preparation method therefor

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Guangdong, China

Tengyu Liang