SiOitalicx/italic-based High-capacity Anode Materials for Li-ion Batteries

Si-based anode materials have drawn much attention because of their higher specific capacity compared to graphite currently used in the anode of commercial lithium-ion batteries (LIBs). However, their practical use is still limited because of poor cycle performance derived from a high volume expansion rate of ~300% during cycling. Silicon suboxides (SiOx) are under intensive investigation as a very promising anode material for next-generation LIBs, with the highest cycle performance among Si-based ones thanks to the formation of a buffer phase during the first cycle of lithiation. This mini-review covers research progresses in SiOx-based high-capacity anode materials. The structural models and electrochemical characteristics of SiOx are presented, as well as efforts to improve its electrochemical performance.