Amorphous silicon dioxide-based composites for high-performance Li-ion battery anodes

Abstract

To design high performance SiO2-based anodes for Li-ion batteries (LIBs), an amorphous SiO2-FeSigraphite (alpha-SiO2/FeSi/G) composite was synthesized by a simple solid state synthetic method using SiO, Fe, and graphite powders. The alpha-SiO2/FeSi/G composite was comprised of well dispersed amorphous SiO2 and tiny (5-10 nm sized) FeSi inactive matrices within the graphite buffering matrices. The alpha-SiO2/FeSi/G composite electrode showed excellent electrochemical performance featuring high initial charge capacity of 729 m Ah g(-1), with high initial Coulombic efficiency of approximately 74%, and long capacity retention of 93.7% after 200 cycles, with a highly reversible capacity of 683 m Ah g(-1). (C) 2018 Elsevier Ltd. All rights reserved.