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

通信作者：Guo, JB[1];Wu, HM[2];Guo, JB[2]

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;[4]Guiyang Univ, Coll Chem & Mat Engn, Guiyang 550005, Peoples R China;[5]Guizhou Qiancai S&T Dev Co Ltd, 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;corresponding author), Natl Engn Res Ctr Compounding & Modificat Polymer, Guiyang 550014, Peoples R China.

年份：2022

卷号：409

外文期刊名：POWDER TECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000843005800001)】；

基金：Acknowledgements Authors gratefully acknowledge financial support from Natural Sci-ence Foundation of China (52063005) , Science and Technology Project of Guizhou (2016/5667) and (2021488) , Science and Technology Foundation of Guizhou Province (2019/5635) .

语种：英文

外文关键词：Yttrium and fluorine co-doping; LiNi0.5Mn1.5O4 materials; Electrochemical property; Microcrack

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. Y(3+ )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 Y(3+ )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 elec-trochemical properties shows that Y-F co-doping has a positive impact on rate capability and cycling stability of LNMO materials.