Fabrication and Electrochemical Performance of LiNi0.5Co0.2Mn0.3O2 Coated with Nano FePO4 as Cathode Material for Lithium-ion Batteries
DONG Peng1,2, ZHANG Ying-jie1,2, LIU Jia-ming1,2, LI Xue1,2
1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Yunnan Province Engineering Laboratory for Advanced Batteries and Materials, Kunming 650093, China
Abstract：Layered LiNi0.5Co0.2Mn0.3O2 coated with homogeneous nano FePO4 suspension was prepared by using co-precipitation method. XRD, TG-DTA and TEM were adopted to characterize the structure, morphology and liquid state of FePO4 prepared. The structure, morphology and electrochemical performance of the coated materials prepared were characterized by the means such as XRD, SEM, EDS, TEM, ICP, galvanostatic charge-discharge cycling, cyclic voltammetry (CV) and electrochemical impedance spectroscopy(EIS) tests. The effect of heat treatment temperature and coating quantity on the structure and electrochemical performance of coated LiNi0.5Co0.2Mn0.3O2 by co-precipitation method was explored. The results show that 400℃ and 2%(mass fraction,the same below) FePO4 coating can significantly improve cycle performance and rate capability of LiNi0.5Co0.2Mn0.3O2, CV and EIS testing results reveal that FePO4 coating can improve the reversibility and dynamic performance for LiNi0.5Co0.2Mn0.3O2. ICP results show that FePO4 coating layer can effectively reduce the electrolyte to dissolute and erode cathode materials, stabilize its layered structure, then improve the electrochemical performance of cathode materials.
董鹏, 张英杰, 刘嘉铭, 李雪. 纳米磷酸铁包覆锂离子电池正极材料LiNi0.5Co0.2Mn0.3O2的制备及其电化学性能[J]. 材料工程, 2017, 45(11): 49-57.
DONG Peng, ZHANG Ying-jie, LIU Jia-ming, LI Xue. Fabrication and Electrochemical Performance of LiNi0.5Co0.2Mn0.3O2 Coated with Nano FePO4 as Cathode Material for Lithium-ion Batteries. Journal of Materials Engineering, 2017, 45(11): 49-57.
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