文献类型：会议论文

英文题名：Effect of na doping or substitution on the structural and electrochemical properties of cobalt-free li-rich mn-based cathode materials

作者：Li, Weiwei[1]; Yao, Lu[1]; Si, Jiangju[1]; Yang, Jie[1]; Lang, Wuke[1]; Blegoa, S.N.[2]

第一作者：李伟伟

通讯作者：Li, Weiwei

机构：[1] College of Chemistry and Chemical Engineering, Xinxiang University, Xinxiang, Henan, 453003, China; [2] Department of Materials Engineering, Niger Delta University, Nigeria

第一机构：新乡学院化学化工学院

会议论文集：Materials Science and Industrial Applications II

会议日期：January 11, 2020 - January 12, 2020

会议地点：Xi’an, China

语种：英文

外文关键词：Cathode materials - Cathodes - Cobalt - Electric discharges - Electrochemical properties - Lithium-ion batteries - Scanning electron microscopy - Sol-gel process - Sol-gels - Stability - X ray photoelectron spectroscopy

摘要：Cobalt-free Li-rich Mn-based cathode materials are considered to be the next generation of Li-ion batteries due to high discharge capacities and high safety feature. However, there are still several serious issues that need to be solved urgently, such as low rate capability, poor cycling performance and voltage fading. Na doping or substitution is introduced to improve the electrochemical properties of Li1.2Mn0.6Ni0.2O2, which is synthesized by sol-gel method. The effect of Na doping or substitution on the morphological, structural and electrochemical properties was systematically studied and analyzed by scanning electron microscope (SEM), X-Ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), cell test system and electrochemical workstation. These results illustrate that lattice layer spacing is enlarged by Na doping or substitution, which is beneficial for the diffusion of Li-ion, and the voltage fading is successfully suppressed. The best electrochemical properties were obtained when Na doping, which is attributed to the stronger structural stability and better reversibility of Li+ during the initial charge and discharge process. ? 2020 Trans Tech Publications Ltd, Switzerland.