文献类型：期刊文献

英文题名：A Redox Couple Strategy Enables Long-Cycling Li- and Mn-Rich Layered Oxide Cathodes by Suppressing Oxygen Release

作者：Shao, Qinong[1];Gao, Panyu[2];Yan, Chenhui[1];Gao, Mingxi[1];Du, Wubin[1];Chen, Jian[3];Yang, Yaxiong[3];Gan, Jiantuo[3];Wu, Zhijun[3];Zhang, Chenyang[4];Chen, Gairong[4];Zheng, Xusheng[5];Lin, Yue[6];Jiang, Yinzhu[1];Sun, Wenping[1];Liu, Yongfeng[1];Gao, Mingxia[1];Pan, Hongge[1]

第一作者：Shao, Qinong

通讯作者：Pan, HG[1]

机构：[1]Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China;[2]Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China;[3]Xian Technol Univ, Inst Sci & Technol New Energy, Xian 710021, Peoples R China;[4]Xinxiang Univ, Coll Chem & Chem Engn, Xinxiang 453003, Henan, Peoples R China;[5]Univ Sci & Technol China, Natl Synchrotron Radiat Lab NSRL, Hefei 230029, Peoples R China;[6]Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China

第一机构：Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China

通讯机构：[1]corresponding author), Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China.

年份：2022

卷号：34

期号：14

外文期刊名：ADVANCED MATERIALS

收录：;EI(收录号：20220911709557);Scopus(收录号：2-s2.0-85125183738);WOS:【SCI-EXPANDED(收录号:WOS:000760617600001)】；

基金：Q.S. and P.G. contributed equally to this work. The authors gratefully acknowledge the financial support from the key program of the National Natural Science Foundation of China (Grant Nos. 51831009 and 51571178) and the National Natural Science Foundation of China (Grant Nos. 52071285 and 51901168).

语种：英文

外文关键词：anionic redox; Li- and Mn-rich layered oxides; lithium-ion batteries; oxygen release; redox couples

摘要：Li- and Mn-rich layered oxides (LMROs) are considered the most promising cathode candidates for next-generation high-energy lithium-ion batteries. The poor cycling stability and fast voltage fading resulting from oxygen release during charging, however, severely hinders their practical application. Herein, a strategy of introducing an additional redox couple is proposed to eliminate the persistent problem of oxygen release. As a proof of concept, the cycling stability of Li1.2Ni0.13Co0.13Mn0.54O2, which is a typical LMRO cathode, is substantially enhanced with the help of the S2-/SO32- redox couple, and the capacity shows no decay with a retention of 100% after 700 cycles at 1C, far superior to the bare counterpart (61.7%). The surface peroxide ions (O-2(2-)) are readily chemically reduced back to immobile O2- by S2- during charging, accompanied by the formation of SO32-, which plays a critical role in stabilizing the oxygen lattice and eventually inhibiting the release of oxygen. More importantly, the S2- ions are regenerated during the following discharging process and participate in the chemical redox reaction again. The findings shed light on a potential direction to tackle the poor cycling stability of high-energy anion-redox cathode materials for rechargeable metal-ion batteries.