Negative electrode active material, negative electrode comprising negative electrode active material, secondary battery comprising negative electrode, and method for preparing negative electrode active material

Abstract

A negative electrode active material including: silicon-containing composite particles including (a) SiOx, wherein 0<x<2, (b) pores, and (c) a Mg compound or a Li compound; an outer carbon layer present on the surface of the silicon-containing composite particle; and an inner carbon layer present inside the pores, in which a BET specific surface area of the negative electrode active material is 3 m2/g to 15 m2/g, a negative electrode including the same, a secondary battery including the negative electrode and a method for preparing the negative electrode active material.

Dependencies are inferred from the claim text.