文献类型：期刊文献

英文题名：Enhancing performances of Co-free Li-rich Mn-based layered cathode materials via interface modification of multiple-functional Mn3O4 shell

作者：Wu, Chao[1]; Cao, Shuang[1]; Li, Heng[1]; Li, Zhi[1]; Chen, Gairong[2]; Guo, Xiaowei[2]; Chang, Baobao[3]; Bai, Yansong[1]; Wang, Xianyou[1]

第一作者：Wu, Chao

机构：[1] National Base for International Science & Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage & Conversion, School of Chemistry, Xiangtan University, Xiangtan, 411105, China; [2] School of Chemistry & Materials Engineering, Xinxiang University, Henan, 453003, China; [3] China Key laboratory of Materials Processing and Mold of Ministry of Education, Zhengzhou University, Zhengzhou, Henan, 450001, China

第一机构：National Base for International Science & Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage & Conversion, School of Chemistry, Xiangtan University, Xiangtan, 411105, China

通讯机构：[1]National Base for International Science & Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage & Conversion, School of Chemistry, Xiangtan University, Xiangtan, 411105, China

年份：2022

卷号：431

外文期刊名：Chemical Engineering Journal

收录：EI(收录号：20215211376368);Scopus(收录号：2-s2.0-85121508534)

语种：英文

外文关键词：Lithium compounds - Jahn-Teller effect - Manganese oxide - Cathodes - Interfaces (materials) - Nickel compounds

摘要：Herein, we put forward a feasible interfacial modification strategy in virtue of Mn3O4 surface coating to construct protective shell and alleviate Jahn-Teller distortion during the charge/discharge process. It has been found that the increase of the oxygen vacancy on the surface of Li1.2Ni0.27Mn0.54O2 of (LRNMO) after Mn3O4 protective layer modification can effectively restrain the release of oxygen and enhancing rate capability, and thus improving its comprehensive electrochemical performances. In particular, the initial coulombic efficiency of the optimized LRNMO-1 electrode is improved from 72.3% to 84.3%. The capacity retention rate is up to 95.6% at 250 mA g?1 (1C) after 200 cycles. In addition, the LRNMO-1 electrode also has a good capacity retention rate (96.4% after 100 cycles) at a high current density of 5C. Moreover, the designed LRNMO@Mn3O4 cathode exhibits higher ionic conductivity and better interface stability. As a result, this work offers a practicable and valuable exploration for the development and industrialization of Co-free Li-rich Mn-based cathode materials with high energy density. ? 2021