Interfacial Mn Vacancy for Li-Rich Mn-Based Oxide Cathodes

Youchen Hao; Xifei Li; Wen Liu; Jingjing Wang; Hui Shan; Wenbin Li; Xianyou Wang

doi:10.1021/acsami.2c03635

Interfacial Mn Vacancy for Li-Rich Mn-Based Oxide Cathodes

ACS Appl Mater Interfaces. 2022 May 18;14(19):22161-22169. doi: 10.1021/acsami.2c03635. Epub 2022 May 9.

Authors

Youchen Hao¹, Xifei Li¹, Wen Liu¹, Jingjing Wang¹, Hui Shan¹, Wenbin Li¹, Xianyou Wang²

Affiliations

¹ Shaanxi International Joint Research Centre of Surface Technology for Energy Storage Materials, Xi'an Key Laboratory of New Energy Materials and Devices, Institute of Advanced Electrochemical Energy, School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China.
² Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, School of Chemistry, Xiangtan University, Xiangtan, Hunan 411105, China.

PMID: 35533078
DOI: 10.1021/acsami.2c03635

Abstract

Apart from the O releasing at a low rate, large polarization at a high rate is also a big challenge for Li-rich Mn-based oxide (LMO). Prussian blue (PB) with a specific redox potential is regarded as a suitable coating layer to overcome these drawbacks, while its stability is easily destroyed by the intrinsic Jahn-Teller effect after a long run. Herein, Mn vacancy (M_V) is introduced into the PB coating layer to enhance its stability. Consequently, such an electrode (M_V-PB@LMO) presents a prolonged lifespan compared to the electrode with a PB coating layer only. Furthermore, it is found that the electrode with Mn vacancy in LMO (M_V@LMO) shows superior reversibility, which displays a boosted activity of LMO. This research exhibits the advanced merits of Mn vacancy for LMO, and further work may pay more attention to strengthening of the stability of M_V@LMO.

Keywords: Li-rich Mn-based oxide; Mn vacancy; Prussian blue; boosted activity; prolonged lifespan.