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

A lithium-ion secondary battery anode comprising:

• an anode active material layer including a plurality of anode active material particles,
• wherein,
• 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, and
• the 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.

A power tool activated by a lithium-ion secondary battery as a power supply, the lithium-ion secondary battery including a cathode, an anode, and an electrolytic solution, the anode comprising:

• an anode active material layer including a plurality of anode active material particles,
• wherein,
• 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, and
• the 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.

An electric vehicle activated by a lithium-ion secondary battery as a power supply, the lithium-ion secondary battery including a cathode, an anode, and an electrolytic solution, the anode comprising:

• an anode active material layer including a plurality of anode active material particles,
• wherein,
• 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, and
• the 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.

An energy storage system using a lithium-ion secondary battery as a power storage source, the lithium-ion secondary battery including a cathode, an anode, and an electrolytic solution, the anode comprising:

• an anode active material layer including a plurality of anode active material particles,
• wherein,
• 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, and
• the 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.