文献类型：期刊文献

英文题名：Synergistic effect of Mg and Y co-dopants on enhancement of electrochemical properties of LiNi0.5Mn1.5O4 spinel

作者：Lin, Fangchang Guo, Jianbing Wang, Liyuan Zhou, Ying Wu, Hongming Zhou, Dengfeng

第一作者：Lin, Fangchang

通信作者：Guo, JB[1];Wang, LY[1]

机构：[1]Guizhou Univ, Coll Mat & Met, Dept Polymer Mat & Engn, Guiyang 550025, Peoples R China;[2]Natl Engn Res Ctr Compounding & Modificat Polymer, Guiyang 550014, Peoples R China;[3]Guizhou Inst Technol, Sch Mat & Met Engn, Guiyang 550003, Peoples R China

第一机构：Guizhou Univ, Coll Mat & Met, Dept Polymer Mat & Engn, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Mat & Met, Dept Polymer Mat & Engn, Guiyang 550025, Peoples R China.

年份：2021

卷号：399

外文期刊名：ELECTROCHIMICA ACTA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000718154300004)】；

基金：Authors gratefully acknowledge financial support from Science and Technology Project of Guizhou (2016/5667) , Natural Science Foundation of China (52063005) , Science and Technology Support Project of Guizhou Province (2021488) .

语种：英文

外文关键词：LiNi0.5Mn1.5O4 materials; Cycling stability; Magnesium and yttrium co-doping; Synergistic effect

摘要：The LiNi0.5-xMgxMn1.48Y0.02O4 (x = 0.005, 0.01, 0.03) and LiNi0.5Mn1.5O4 (LNMO) cathode materials were synthesized successfully through a citric acid aided route. The relationship between material characteristics (structure and morphology) and electrochemical properties of LNMO cathode materials was investigated. It was found that synergistic effect of co-doped magnesium and yttrium ions resulted in marked enhancement of electrochemical properties of LNMO cathode. SEM observation showed that Mg-Y co-doped samples possessed spinel structure with truncated octahedron morphology. After co-doping Mg and Y, the XRD and TEM analyses showed that lattice parameters for LNMO samples were improved, thus improving the rate and cycling property. XPS results of Mg-Y co-doped spinel LiNi0.5Mn1.5O4 indicated the presence of Mg2+ and Y3+ in the spinel lattice. Notably, LiNi0.49Mg0.01Mn1.48Y0.02O4 exhibited both optimal cycling stability and rate performance. LiNi0.49Mg0.01Mn1.48Y0.02O4 sample retained specific capacity of 131 mAh g(-1) after 100 cycles at high current density of 1 C with superior retention of 98.49% and the specific capacity reached 118 mAh g(-1) at 5 C. While undoped sample only retained 107 mAh g(-1) after 100 cycles at 1 C with lower retention of 94.69% and its specific capacity was 84 mAh g(-1) at 5 C. (C) 2021 Elsevier Ltd. All rights reserved.