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

通讯作者：Bai, YS[1];Wang, XY[1]

机构：[1]Xiangtan Univ, Sch Chem, Natl Base Int Sci & Technol Cooperat, Natl Local Joint Engn Lab Key Mat New Energy Stor, Xiangtan 411105, Peoples R China;[2]Xinxiang Univ, Sch Chem & Mat Engn, Xinxiang 453003, Henan, Peoples R China;[3]Zhengzhou Univ, Minist Educ, China Key Lab Mat Proc & Mold, Zhengzhou 450001, Henan, Peoples R China

第一机构：Xiangtan Univ, Sch Chem, Natl Base Int Sci & Technol Cooperat, Natl Local Joint Engn Lab Key Mat New Energy Stor, Xiangtan 411105, Peoples R China

通讯机构：[1]corresponding author), Xiangtan Univ, Sch Chem, Natl Base Int Sci & Technol Cooperat, Natl Local Joint Engn Lab Key Mat New Energy Stor, Xiangtan 411105, Peoples R China.

年份：2022

卷号：431

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000777587300005)】；

基金：Acknowledgments This work was supported financially by the Key Project of Strategic New Industry of Hunan Province (No.2019GK2032) , the Natural Science Foundation of Hunan Province (No. 2021JJ30651) , the Science and Technology Program of Xiangtan (No.GX-ZD20211004) and the Na-tional Natural Science Foundation of China (No.U19A2018) . The au-thors would like to thank eceshi ( www.ece.com ) for the XPS test.

语种：英文

外文关键词：Co-free Li-rich layered cathode materials; Interface modification; Oxygen vacancies; Jahn-Teller distortion; Multiple-functional protective shell

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 Li(1.2)Ni(0.2)7Mn(0.54)O(2) 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.