Lithium-ion secondary battery, anode for lithium-ion secondary battery, power tool, electric vehicle and energy storage system

摘要

A lithium-ion secondary battery allowed to improve cycle characteristics and initial charge-discharge characteristics is provided. The lithium-ion secondary battery includes a cathode; an anode; and an electrolytic solution. The anode includes an anode active material layer including a plurality of anode active material particles. The anode active material particles each include a core section and a coating section applied to a part or a whole of a surface of the core section, and the core section includes a silicon-based material (SiOx: 0≦x<0.5) and the coating section includes an amorphous or low-crystalline silicon-based material (SiOy: 0.5≦y≦1.8).

主权项

1. A lithium-ion secondary battery comprising:
a cathode; an anode; and an electrolytic solution, wherein,
the anode includes an anode active material layer including a plurality of anode active material particles,each anode active material particle includes a core section and a coating section applied to a part or all of a surface of the core section, andthe core section includes a silicon-based material SiOx, where 0≦x<0.5, and the coating section includes an amorphous or low-crystalline silicon-based material SiOy, where 0.5≦y≦0.9.