Btr New Material Group Co., Ltd.

Eming Guo

Peng He

Jianguo Ren

Min Yue

Youyuan Huang

Xueqin He

Sheng Li

A core-shell composite negative electrode material is made according to a preparation method and includes an application thereof. The composite negative electrode material includes: a core formed by a first active substance and a second active substance, and a carbon-coated shell serving as a third active substance. The first active substance is a sheet-like silicon-based material, the second active substance is a sheet-like graphite material, and the third substance is the carbon-coated shell. The composite material is applied to the negative electrode of a lithium ion battery, and has high specific capacity, wherein the capacity is greater than 400 mAh/g, and excellent cycle life.

Core-shell composite negative electrode material, preparation method therefor and use thereof

Disclosed is a composite silicon negative electrode material. The composite silicon negative electrode material comprises a nano silicon (), a nano composite layer () coated on the surface of the nano silicon, and a conductive carbon layer () uniformly coated outside the nano composite layer (). The nano composite layer () is a silicon oxide () and a metal alloy (). In the composite silicon negative electrode material with a three-layer structure, the nano composite layer (), composed of the silicon oxide () and the metal alloy () coated on the surface of the silicon oxide (), effectively reduces the volume expansion of the nano silicon (), maintains the characteristic of high conductivity of the silicon material, improves the mobility of lithium ions, prevents direct contact between a silicon negative electrode and an electrolyte, and can form a hard SEI film on the surface of the composite silicon negative electrode material, thereby allowing the cycle performance of the material to be greatly enhanced. The composite silicon negative electrode material has the characteristics of a high capacity, long cycle life and high conductivity. A preparation process for the silicon negative electrode material is simple, easily controllable, and suitable for industrial production.

Composite silicon negative electrode material, preparation method and use

A carbon matrix composite material, a preparation method therefor and a battery comprising the same. The carbon matrix composite material comprises micron-sized soft carbon, micron-sized hard carbon, a nano-active material, a first carbon coating layer and a second carbon coating layer, wherein the first carbon coating layer is coated on a surface of the nano-active material to form composite particles; the composite particles are dispersed on the surfaces of the soft carbon and the hard carbon, and in the second carbon coating layer; and the second carbon coating layer coats soft carbon, the hard carbon and the composite particles.

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Guangdong, China

Eming Guo