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

机构：[1] Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China; [2] National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang, 550014, China; [3] School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China

第一机构：Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China

通信机构：Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China;Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China

年份：2021

卷号：399

外文期刊名：Electrochimica Acta

收录：EI(收录号：20214311082167);Scopus(收录号：2-s2.0-85117783290)

语种：英文

外文关键词：Lithium compounds - Binary alloys - Cathodes - Magnesium - Morphology - Yttrium

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. ? 2021