A fluoride ion-mediated continuous etching–redeposition strategy to synthesize Si nanocomposites with appropriate SiO2 coating layers for Li-ion batteries

Abstract

Silicon nanocomposites with surface coating have been promising candidates for high-performance anodes in Li-ion batteries. Here we report a simple yet effective way to synthesize Si@SiO₂ nanocomposites with amorphous SiO₂ coating through a fluoride ion-mediated continuous etching–redeposition process. The Si@SiO₂ nanocomposite anode exhibits significantly improved lithium storage properties, with a reversible capacity of 1356 mA h g⁻¹ at 2.1 A g⁻¹ for 300 cycles.