文献类型：期刊文献

英文题名：Multifunctional Surface Construction for Long-Term Cycling Stability of Li-Rich Mn-Based Layered Oxide Cathode for Li-Ion Batteries

作者：Yan, Chenhui[1,2];Shao, Qinong[1,2];Yao, Zhihao[1,2];Gao, Mingxi[1,2];Zhang, Chenyang[3];Chen, Gairong[3];Sun, Qianwen[1,2];Sun, Wenping[1,2];Liu, Yongfeng[1,2];Gao, Mingxia[1,2];Pan, Hongge[1,2,4]

第一作者：Yan, Chenhui

通讯作者：Gao, MX[1];Pan, HG[1];Gao, MX[2];Pan, HG[2];Pan, HG[3]

机构：[1]Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China;[2]Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China;[3]Xinxiang Univ, Coll Chem & Chem Engn, Xinxiang 453003, Henan, Peoples R China;[4]Xian Technol Univ, Inst Sci & Technol New Energy, Xian 710021, 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;[2]corresponding author), Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China;[3]corresponding author), Xian Technol Univ, Inst Sci & Technol New Energy, Xian 710021, Peoples R China.

年份：0

外文期刊名：SMALL

收录：;EI(收录号：20222612303756);Scopus(收录号：2-s2.0-85133005111);WOS:【SCI-EXPANDED(收录号:WOS:000818542000001)】；

基金：This work is supported by the National Natural Science Foundation of P. R, China (Grant Nos. 51831009, 51571178). The authors would like to thank Shiyanjia Lab (www.shiyanjia.com) for the Raman analysis.

语种：英文

外文关键词：cycling stability; Li-rich Mn-based layered oxides; lithium-ion batteries; potassium borohydride; surface construction

摘要：Li-rich Mn-based layered oxides (LMLOs) are promising cathode material candidate for the next-generation Li-ion batteries (LIBs) of high energy density. However, the fast capacity fading and voltage decay as well as low Coulombic efficiency caused by irreversible oxygen release and phase transition during the electrochemical process hinder their practical application. To solve these problems, in the present study, a multifunctional surface construction involving a coating layer, spinel-layered heterostructure, and rich-in oxygen vacancies is successfully conducted by a facile thermal reduction of the LMLO particles with potassium borohydride (KBH4) as the reducing agent. The multifunctional surface structure plays synergistic effects on suppressing the interface side reaction, reducing the dissolution of transition metal, increasing electron conductivity and lithium diffusion rate. As a result, electrochemical performances of the LMLO cathode are effectively enhanced. With optimization of the addition of KBH4, the electrode delivers a reversible capacity of 280 mAh g(-1) at 0.1 C, which maintains after 100 cycles. The capacity retention with respect to the initial capacity is as high as 98% at 1 C after 400 cycles. The present work provides insights into designing a highly effective functional surface structure of LMLO cathode materials for high-performance LIBs.