Permeable characteristics of surface film deposited on LiMn2O4 positive electrode revealed by redox-active indicator

Nano Convergence

卷:8

Seung M. Oh¹  Hyun-seung Kim¹  Jin Hyuk Yang²  Ki Jae Kim²  Le Thi Thao²  Ji Woo Han²  Ji Heon Ryu³ 

[1] Department of Chemical and Biological Engineering, Seoul National University;

[2] Department of Energy Engineering, Konkuk University;

[3] Graduate School of Knowledge-based Technology and Energy, Korea Polytechnic University;

关键词: Lithium-ion batteries;    Electrolytes;    Permeable characteristics;    Surface film;    Positive electrode;   

DOI  :  10.1186/s40580-021-00272-9

来源: DOAJ

【 摘 要 】

Abstract Herein, the ferrocene redox indicator-based surface film characteristics of spinel lithium manganese oxide (LMO) were evaluated. The pre-cycling of spinel LMO generated a film on the LMO surface. The surface film deposited on LMO surface suppresses further electrolyte decomposition, while the penetration of approximately 0.7 nm-sized redox indicator is not prevented. The facile self-discharge of LMO and regeneration current from the ferrocenium molecule was observed from the redox indicator in a specifically designed four-electrode cell. From this electrochemical behavior, a small-sized HF molecule attack on the LMO surface through a carbonate-based electrolyte-derived film is defined; hence, the prevention of small-sized molecules into the deposited surface film is crucial for the enhancement of LiMn2O4-based lithium-ion batteries.

【 授权许可】

Unknown