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AssigneeBtr New Material Group Co., Ltd.
InventorsZhiqiang Deng, Chunlei Pang, Jianguo Ren, Youyuan Huang, Min Yue
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The present application provides a composite negative electrode material of a lithium ion battery, a preparation method thereof and the use thereof in a lithium ion battery. The composite negative electrode material includes a SiOx-based active material and a polycarbonate coating layer coated on a surface of the SiOx-based active material. The method includes: (1) preparing a monomer solution of unsaturated carbonate; (2) polymerizing the monomer in presence of a polymerization catalyst to obtain a polymer solution; and (3) adding a SiOx-based active material, water and a polymer catalyst to the polymer solution, and further polymerizing to coat the SiOx-based active material, to obtain the composite negative electrode material.
A composite negative electrode material of a lithium ion battery, comprising a SiOx-based active material and a polycarbonate coating layer coated on a surface of the SiOx-based active material, wherein 0<x≤2, wherein the SiOx-based active material has a particle size ranging from larger than 20 μm to 100 μm or less, and wherein the SiOx-based active material and the polycarbonate coating layer are connected to each other by an unsaturated silane coupling agent.
Dependencies are inferred from the claim text.