Importing Tin Nanoparticles into Biomass-Derived Silicon Oxycarbides with High-Rate Cycling Capability Based on Supercritical Fluid Technology.

摘要: Silicon oxycarbides (SiOC) are regarded as potential anode materials for lithium-ion batteries, although inferior cycling stability and rate performance greatly limit their practical applications. Herein, amorphous SiOC is synthesized from Chlorella by means of a biotemplate method based on supercritical fluid technology. On this basis, tin particles with sizes several nanometers introduced into the matrix through biosorption feature Chlorella. As battery anodes, Sn@SiOC can deliver reversible capacities 440 502 mAh g-1 after 300 cycles at 100 mA g-1 great stability. Furthermore, as-synthesized presents an excellent high-rate capability, which exhibits capacity 209 mAh g-1 800 cycles 5000 mA g-1 ; 1.6 times higher than that SiOC. Such novel approach has significance preparation high-performance SiOC-based anodes.