文献类型：期刊文献

英文题名：Tuning Li2MO3 phase abundance and suppressing migration of transition metal ions to improve the overall performance of Li- and Mn-rich layered oxide cathode

作者：Zhang, Shiming[1];Tang, Tian[1];Ma, Zhihua[3];Gu, Haitao[2];Du, Wubing[1];Gao, Mingxia[1];Liu, Yongfeng[1];Jian, Dechao[2];Pan, Hongge[1]

第一作者：Zhang, Shiming

通讯作者：Gao, MX[1];Pan, HG[1]

机构：[1]Zhejiang Univ, State Key Lab Silicon Mat, Sch Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China;[2]Shanghai Inst Space Power Sources, State Key Lab Space Power Technol, Shanghai 200245, Peoples R China;[3]Xinxiang Univ, Coll Chem & Chem Engn, Xinxiang 453003, Henan, Peoples R China

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

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

年份：2018

卷号：380

起止页码：1-11

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20181004855177);Scopus(收录号：2-s2.0-85042681204);WOS:【SCI-EXPANDED(收录号:WOS:000428007400001)】；

基金：This work was supported by the National Natural Science Foundation of the PR China (No. 51571178), the Aerospace Science and Technology Innovation Fund of CASC, the National Materials Genome Project (2016YFB0700600), and the National Natural Science Foundation of PR China (No. 51371158).

语种：英文

外文关键词：Mg2+ ions substitution; Electrochemical performance; Li-and Mn-rich layered oxide cathode; Lithium-ion batteries

摘要：The poor cycling stability of Li- and Mn-rich layered oxide cathodes used in lithium-ion batteries (LIBs) has severely limited their practical application. Unfortunately, current strategies to improve their lifecycle sacrifice initial capacity. In this paper, we firstly report the synergistic improvement of the electrochemical performance of a Li1.2Ni0.13Co0.13Mn0.54O2 (LNCMO) cathode material, including gains for capacity, cycling stability, and rate capability, by the partial substitution of Li+ ions by Mg2+ ions. Electrochemical performance is evaluated by a galvanostatic charge and discharge test and electrochemical impedance spectroscopy (EIS). Structure and morphology are characterized by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Compared with the substitution of transition metal (TM) ions with Mg2+ ions reported previously, the substitution of Li+ ions by Mg2+ ions not only drastically ameliorates the capacity retention and rate performance challenges of LNCMO cathodes but also markedly suppresses their voltage fading, due to the inhibition of the migration of TM ions during cycling, while also increasing the capacity of the cathode due to an increased abundance of the Li2MO3 phase.