Formulating Local Environment of Oxygen Mitigates Voltage Hysteresis in Li-Rich Materials

Formulating Local Environment of Oxygen Mitigates Voltage Hysteresis in Li-Rich Materials

© 2024 Wiley‐VCH GmbH.

Détails bibliographiques
Publié dans:Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 16 vom: 09. Apr., Seite e2311814
Auteur principal: Zhang, Mengke (Auteur)
Autres auteurs: Qiu, Lang, Hua, Weibo, Song, Yang, Deng, Yuting, Wu, Zhenguo, Zhu, Yanfang, Zhong, Benhe, Chou, Shulei, Dou, Shixue, Xiao, Yao, Guo, Xiaodong
Format: Article en ligne
Langue:English
Publié: 2024
Accès à la collection:Advanced materials (Deerfield Beach, Fla.)
Sujets:Journal Article Li‐rich materials O redox, reaction activity local environment voltage hysteresis
Description
Résumé:© 2024 Wiley‐VCH GmbH.
Li-rich cathode materials have emerged as one of the most prospective options for Li-ion batteries owing to their remarkable energy density (>900 Wh kg-1). However, voltage hysteresis during charge and discharge process lowers the energy conversion efficiency, which hinders their application in practical devices. Herein, the fundamental reason for voltage hysteresis through investigating the O redox behavior under different (de)lithiation states is unveiled and it is successfully addressed by formulating the local environment of O2-. In Li-rich Mn-based materials, it is confirmed that there exists reaction activity of oxygen ions at low discharge voltage (<3.6 V) in the presence of TM-TM-Li ordered arrangement, generating massive amount of voltage hysteresis and resulting in a decreased energy efficiency (80.95%). Moreover, in the case where Li 2b sites are numerously occupied by TM ions, the local environment of O2- evolves, the reactivity of oxygen ions at low voltage is significantly inhibited, thus giving rise to the large energy conversion efficiency (89.07%). This study reveals the structure-activity relationship between the local environment around O2- and voltage hysteresis, which provides guidance in designing next-generation high-performance cathode materials
Description:Date Revised 18.04.2024
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202311814