▎ 摘　　要

NOVELTY - Negative electrode active material comprises composite particles comprising a first region and a second region, where the first region has a disordered carbon structure and the second region has an ordered carbon structure and/or a metal oxide structure. The composite particle surface comprises the first region, where the first region includes a first active material including hard carbon. The second region includes a second active material including graphite, graphene, carbon nanotubes, lithium oxide, or transition metal oxide. The X-ray photoelectron spectrum of the negative active material has characteristic peaks in the range of 283-288eV. The specific surface area of the negative electrode active material is 1-50 m2/g. USE - Negative electrode active material used in secondary battery for electronic device (all claimed). ADVANTAGE - The negative electrode active material has high gram capacity and active ion diffusion coefficient, so that the secondary battery containing the negative electrode active material has higher energy density and excellent cycle performance, rate performance, and fast charging ability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a secondary battery, which comprises a negative electrode comprising a negative electrode active material layer and a current collector, the negative electrode active material layer comprises the negative electrode active material.