CPC H01M 4/386 (2013.01) [H01M 4/0416 (2013.01); H01M 4/387 (2013.01); H01M 2004/027 (2013.01)] | 15 Claims |
1. A negative electrode active material, comprising a core material and a polymer-modified coating layer on at least part of a surface of the core material;
wherein
the core material comprises one or more of a silicon-based negative electrode material and a tin-based negative electrode material;
the polymer-modified coating layer comprises sulfur element and carbon element;
the sulfur element has a mass percentage of from 0.2% to 4% in the negative electrode active material;
the carbon element has a mass percentage of from 0.5% to 4% in the negative electrode active material;
the polymer-modified coating layer comprises —S—C— bond; and
the polymer-modified coating layer further comprises —S—S— bond.
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