文献类型：期刊文献

英文题名：Effects of reheating temperature on the structure, morphology and electrochemical performance of Ni-rich cathode materials

作者：Ge, Wujie Bai, Lang Li, Xiang

第一作者：葛武杰

通信作者：Li, X[1]

机构：[1]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China;[2]Henan Univ Sci & Technol, Chem Engn & Pharmaceut Sch, Luoyang 471023, Peoples R China

第一机构：贵州理工学院化学工程学院

通信机构：corresponding author), Henan Univ Sci & Technol, Chem Engn & Pharmaceut Sch, Luoyang 471023, Peoples R China.

年份：2021

卷号：876

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20211910319309);Scopus(收录号：2-s2.0-85105336336);WOS:【SCI-EXPANDED(收录号:WOS:000660306800002)】；

基金：This work was supported by the National Natural Science Foundation of China, China (No. 21805053) , the Science and Technology Planning Project of Guizhou Province, China (No. [2019] 1132) ; Key Scientific Research Projects of Colleges and Universities of Henan Provincial Department of Education, China (No. 21A150018) ; Academic Xin Miao and Innovation Exploration Project, China (No. [2017] 5789-07) ; High Level Scientific Research Funding Project of Guizhou Institute of Technology, China (XJGC20190901) .

语种：英文

外文关键词：Reheating; Ni-rich; Cathode; Lithium-ion batteries

摘要：The effects of reheating temperature on Ni-rich LiNi0.865Co0.095Al0.04O2 (NCA) are investigated since reheating process is required during surface modification and removal of adhered water molecules. It is shown that reheating temperature can exert observable influences on the structure, morphology, and electrochemical performance of the as-prepared Ni-rich cathode materials. In this work, commercial precursors were calcinated and reheated at 300, 450, 600, and 750 degrees C. After that, they were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and electrochemical tests. XRD results confirmed that the occupancy of Ni2+ in the Li layer first decreases and then increases with increasing reheating temperature, and variation of Li layer spacing follows the same trend. Increasing reheating temperature accelerates the aggregation of lithium-related compounds such as Li2CO3 and LiOH. Interestingly, as the reheating temperature increases to 750 degrees C, the sample reverted to a smooth-like morphology, with an increase in the amount of Ni3+ at the surface. A higher capacity with better cyclic performance can be attained for NCA when reheated at 750 degrees C. Hence, reheating Ni-rich cathodes at suitable temperature can result in promising electrodes with advanced electrochemical performance. (C) 2021 Elsevier B.V. All rights reserved.