Porous carbon networks containing Si and SnO2 as high performance anode materials for lithium-ion batteries

Porous carbon networks containing Si and SnO2were synthesized by annealing the films formed by knife coating suspension with Si, SnCl2, polyacrylonitrile (PAN), poly(methyl methacrylate) (PMMA) and N,N-Dimethylformamide (DMF) in vacuum. The Si-SnO2-C composite was constructed by interconnected amorphous carbon branches containing nano-pores with a size of 1-5 nm, Si and SnO2 nano-particles with a size of 30-50 nm. The composite demonstrates high performance as lithium-ion batteries (LIBs) anode. It delivers a high capacity of 1359.12 mA h g−1after 200 cycling at a current density of 0.5 A g−1and excellent rate capability of 512.16 mA h g−1at a current density up to 20 A g−1.