期刊
ADVANCED ENERGY MATERIALS
卷 11, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202100185
关键词
batteries; Bi2O2Se; in situ investigations; X‐ ray absorption spectroscopy
类别
资金
- Australian Research Council (ARC) [DP210101486, FT160100251, DP170102406]
- National Natural Science Foundation of China [U1904216]
- AINSE Limited
The study investigates the electrochemical reaction mechanism of Bi2O2Se as anodes for lithium-ion batteries and potassium-ion batteries. Surprisingly, the Bi2O2Se/graphite composite electrode shows even better cycle stability for potassium-ion batteries. The research provides new insights into the anionic electrochemistry of Se2- in Bi2O2Se, leading to potential improvements in battery performances.
Elucidating the battery operating mechanism is important for designing better conversion-type anodes as it determines the strategies used to improve electrochemical performances. Herein, the authors pioneered the electrochemical study of layered Bi2O2Se as anodes for lithium-ion batteries (LIBs) and potassium-ion batteries (PIBs). Surprisingly, the Bi2O2Se/graphite composite electrode shows even better cycle stability for PIBs. The electrochemical reaction mechanisms of the Bi2O2Se/graphite electrode for LIBs and PIBs are investigated by potential-resolved in situ and ex situ X-ray absorption spectroscopy based at the Bi L-III-edge and Se K-edge through characterizing the local atomic structure evolution, valence state change, and charge transfer. New insights are gained regarding the electrochemical process of Se2- anions in Bi2O2Se, where multiple Li-Se intermediates rather than the traditional single-phase Li2Se are involved in this conversion-type anode. The advanced understanding of anionic electrochemistry in conversion-type anodes prompts one to find appropriate ways to suppress side-reactions and improve the battery performances.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据