Experimental details; SEM, TEM, Raman,TG, BET and XPS results; Electrochemical properties.

Detailed processes for experiments; SEM images (Figure S1); TEM image (Figure S2); particle size distribution diagrams (Figure S3); Raman and TG curve (Figure S4); BET and XPS images (Figure S5 and S6).Lithium ion diffusion coefficient diagram (Figure S7); Galvanostatic charge-discharge proffles (Figure S8).