Extracting lignin-SiO2 composites from Si-rich biomass to prepare Si/C anode materials for lithium ions batteries

The comprehensive utilization of Si-rich biomass is restrained by macromolecular lignin and a large amount ash. In this study, rice husks (RHs) are treated as representative alkali extraction acid precipitation, the obtained lignin-SiO2 composite modified carbonazation, ball milling, magnesiothermic reduction additives. Through these processes, Si/C with excellent electrochemical properties performs stable cycling performance high specific capacity retention 572 mA h g?1 at 1 A after 1000 cycles. This introduced method provides potential for utilizing comprehensively preparing desirable anode materials from derived composites.