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

• DOI: 10.1002/adma.202311814
• Publication Date: 2024-01-09T16:03:29Z
• Authors: Mengke Zhang; Lang Qiu; Weibo Hua; Yang Song; Yuting Deng; Zhenguo Wu; Yanfang Zhu; Benhe Zhong; Shulei Chou; Shixue Dou; Yao Xiao; Xiaodong Guo
• Keywords: Hysteresis

Abstract 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 conversion efficiency, which hinders application in practical devices. Herein, fundamental reason through investigating O redox behavior under different (de)lithiation states is unveiled it successfully addressed by formulating local environment 2− . In Mn‐based materials, confirmed that there exists reaction activity oxygen ions at low (<3.6 V) presence TM‐TM‐Li ordered arrangement, generating massive amount resulting a decreased efficiency (80.95%). Moreover, case where Li 2b sites are numerously occupied TM ions, evolves, reactivity significantly inhibited, thus giving rise large (89.07%). This study reveals structure–activity relationship between around hysteresis, provides guidance designing next‐generation high‐performance materials.