Silicon-based fine particle / silicon-containing polymer composite, SiOC structure, and negative electrode composition using SiOC structure, negative electrode and secondary battery

摘要

PROBLEM TO BE SOLVED: To provide a material for a negative electrode active material showing a good capacity retention rate and a Coulomb efficiency, a method for producing the material, and a composition for a negative electrode using the material, a negative electrode and a secondary battery. A SiOC-coated layer containing (A) at least one silicon-based fine particle and (B) at least Si (silicon), O (oxygen), and C (carbon) as constituent elements, and at least the above. One silicon-based fine particle is coated with the SiOC coat layer, and has an average particle diameter in the range of 1 nm to 999 μm according to a volume-based particle size distribution. [Selection diagram] Fig. 1