文献类型：期刊文献

英文题名：The action of Y-F co-doping in LiNi0.5Mn1.5O4 positive electrode materials

作者：Lin, Fangchang Wu, Hongming Chen, Tianci Zhou, Dengfeng Yan, Wei Guo, Jianbing

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; [4] College of chemistry and materials engineering Guiyang university, Guiyang, 550005, China; [5] Guizhou Qiancai S&T Development Co., Ltd., 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：National Engineering Research Center for Compounding and Modification of Polymer Materials, Guiyang, 550014, China;Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China

年份：2022

卷号：409

外文期刊名：Powder Technology

收录：EI(收录号：20223512645249);Scopus(收录号：2-s2.0-85136596372)

语种：英文

外文关键词：Cathodes - Crystal structure - Doping (additives) - Electric discharges - Electrochemical properties - Lithium compounds - Manganese compounds - Microcracks - Nickel compounds - Structural properties - Yttrium

摘要：The addition of either yttrium or fluorine has been reported to enhance electrochemical properties of spinel layered cathode material. In this work, pristine and Y-F co-doped LiNi0.49Mn1.49Y0.02O4-xFx (x = 0.02, 0.04, 0.06) spinel powders were synthesized by a citric acid aided route. The correlation between structural, morphological and electrochemical properties of all four cathodic materials was systematically studied. Y3+ and F? co-doping led to the morphological evolution of LiNi0.5Mn1.5O4 material. The introduction of Y3+ and F? ions decreased the content of Mn3+ ions and lattice volume, which can alleviate the Jahn-Teller distortion and maintain the stability of spinel structure. The predominantly disordered of Y-F co-doped samples exhibited better rate capability. Moreover, the formation of microcracks within Y-F co-doped sample can be suppressed during cycles by Y3+ and F? co-doping, which can enhance the strength of crystal structure, resulting in better cyclic stability. The LiNi0.49Mn1.49Y0.02O0.34F0.06 LNMO sample exhibited optimal electrochemical properties, delivering a discharge capacity of 136.044 mAh g?1 after 200 cycles at 1C with superior retention of 96.8%, and the specific capacity reaching 102.030 mAh g?1 at 5C. The synergistic influence of crystalline structure and morphology on electrochemical properties shows that Y-F co-doping has a positive impact on rate capability and cycling stability of LNMO materials. ? 2022