リチウムイオン二次電池、リチウムイオン二次電池用負極、電動工具、電気自動車および電力貯蔵システム

Japanese Patent JP5842985

B2

PROBLEM TO BE SOLVED: To provide a secondary battery which enables the enhancement in cycle characteristics and initial charge and discharge characteristics.SOLUTION: A secondary battery comprises: a positive electrode; and a negative electrode including a plurality of negative electrode active material particles. The plurality of negative electrode active material particles each include a core part, and a coating part covering at least a part of the surface of the core part. The core part includes a silicon-based material (SiO, where 0