Patent ID: 11876220
Assignee: SHANGHAI SHANSHAN TECH CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 9:
10. A secondary battery, comprising:
a silicon-based anode material including:
an inner core including Si particles and silicon oxide SiOx1, where 0<x1 <2 and the Si particles are substantially uniformly dispersed in the SiOx1, 

a first shell layer, wherein the first shell layer includes a compound of the general formula of MySiOz, and an elemental carbon particles, where 0<y≤4, 0<z≤5, and wherein M includes at least one of Li, Na, Mg, Al, Fe, or Ca, the first shell layer covers the inner core, and
a second shell layer, wherein the second shell layer includes a carbon film layer or a composite film layer formed of a carbon film layer and a conductive additive, and the second shell layer covers the first shell layer,
wherein the content of M in the first shell layer increases from a first side of the first shell layer close to the inner core to a second side of the first shell layer far away from the inner core, and
the content of the elemental carbon particles in the first shell layer is substantially uniformly dispersed in the MySiOz limit sizes of Si particles, improve stability of the silicon-based anode material, and reduce expansion stress of the second shell layer.