Densification of Cathode/Electrolyte Interphase to Enhance Reversibility of LiCoO2 at 4.65 V

Densification of Cathode/Electrolyte Interphase to Enhance Reversibility of LiCoO2 at 4.65 V

© 2024 Wiley‐VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - (2024) vom: 29. Aug., Seite e2408875
1. Verfasser: Ren, Hengyu (VerfasserIn)
Weitere Verfasser: Hu, Jiaxuan, Ji, Haocheng, Huang, Yuxiang, Zhao, Wenguang, Huang, Weiyuan, Wang, Xiaohu, Yi, Haocong, Song, Yongli, Liu, Jiajie, Liu, Tongchao, Liu, Ming, Zhao, Qinghe, Pan, Feng
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article Li‐ion batteries Zr─O deposits cathode/electrolyte interphase high‐voltage LiCoO2 interface reaction
Beschreibung
Zusammenfassung:© 2024 Wiley‐VCH GmbH.
For LiCoO2 (LCO) operated beyond 4.55 V (vs Li/Li+), it usually suffers from severe surface degradation. Constructing a robust cathode/electrolyte interphase (CEI) is effective to alleviate the above issues, however, the correlated mechanisms still remain vague. Herein, a progressively reinforced CEI is realized via constructing Zr─O deposits (ZrO2 and Li2ZrO3) on LCO surface (i.e., Z-LCO). Upon cycle, these Zr─O deposits can promote the decomposition of LiPF6, and progressively convert to the highly dispersed Zr─O─F species. In particular, the chemical reaction between LiF and Zr─O─F species further leads to the densification of CEI, which greatly reinforces its toughness and conductivity. Combining the robust CEI and thin surface rock-salt layer of Z-LCO, several benefits are achieved, including stabilizing the surface lattice oxygen, facilitating the interface Li+ transport kinetics, and enhancing the reversibility of O3/H1-3 phase transition, etc. As a result, the Z-LCO||Li cells exhibit a high capacity retention of 84.2% after 1000 cycles in 3-4.65 V, 80.9% after 1500 cycles in 3-4.6 V, and a high rate capacity of 160 mAh g-1 at 16 C (1 C = 200 mA g-1). This work provides a new insight for developing advanced LCO cathodes
Beschreibung:Date Revised 29.08.2024
published: Print-Electronic
Citation Status Publisher
ISSN:1521-4095
DOI:10.1002/adma.202408875