| abstract |
The invention discloses a fast ion conductor-coated silicon carbon composite material and a preparation method thereof. The composite material presents a core-shell structure, a silicon-based material is used as the inner core, and the outer shell is a fast ion conductor with a mass ratio of 10-40%, 1- 10% conductive agent, 1-10% metal oxide, and the rest are amorphous carbon; based on 100% of the mass of the composite material, the mass ratio of the outer shell is 1-10%; the inner core silicon carbon is a Si-SiO X composite Composition, mass ratio Si:SiO X =0.1-0.5:1. The invention can improve the fast charging performance and the first efficiency of the silicon carbon material, and reduce the expansion. |