SiO<sub>x</sub>-based High-capacity Anode Materials for Li-ion Batteries

Youn, Donghan; Kim, Ji Young; Kim, Seung Tae; Kim, Sohyun; Kim, Sungjin; Kim, Hansu

doi:.0..

J. Electrochem. Sci. Technol > Epub ahead of print

Mini Review

DOI: https://doi.org/10.33961/jecst.2025.00773 [Epub ahead of print]
Published online September 15, 2025.

SiO_x-based High-capacity Anode Materials for Li-ion Batteries

Donghan Youn, Ji Young Kim, Seung Tae Kim, Sohyun Kim, Sungjin Kim, Hansu Kim

Department of Energy Engineering, Hanyang University, Seoul, Korea, Republic of

Correspondence: Hansu Kim, Tel: +82-2-2220-4412,
Email: khansu@hanyang.ac.kr

Received: 11 August 2025 • Accepted: 26 August 2025

Abstract

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 (SiO_x) 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 SiO_x-based high-capacity anode materials. The structural models and electrochemical characteristics of SiO_x are presented, as well as efforts to improve its electrochemical performance.

Keywords: Anode, Silicon suboxide, SiO_x, SiO, Li-ion battery