高等学校化学学报2017，Vol.38Issue(8)：1458-1464,7.DOI:10.7503/cjcu20160781
Na+掺杂锂离子电池正极材料 LiNi0.6Co0.2Mn0.2O2的制备及电化学性能
Preparation and Electrochemical Performance of Na+-stabilized Layered LiNi0.6Co0.2Mn0.2O2 Cathode Material for Lithium-ion Batteries
摘要
Abstract
Na-doped Li0.98Na0.02Ni0.6Co0.2Mn0.2O2 cathode material was synthesized through a simple oxalate co-precipitation.Powder X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), energy dispersive X-ray spectroscopy(EDS), inductively coupled plasma-atomic emission spectrometry(ICP-AES), electrochemical impedance spectroscopy(EIS) and galvanostatic charge-discharge tests were employed to analyze the particle morphology, crystal structure and electrochemical properties of the as-prepared materials.Results indicate that the Na-stabilized sample has a more ordered α-NaFeO2 structure(space group R3m), reduced Li+/Ni2+ cation mixing and enlarged Li layer spacing, which facilitates the fast insertion and extraction of Li+ ions in the bulk structure.Electrochemical results confirm that the Na-stabilized sample has excellent cycling stability and high rate performance.After 100 cycles at 1C between 2.7 V and 4.3 V, the cathode delivers a discharge capacity of 146 mA·h/g with capacity retention of 95.4%.At 0.1C, 0.2C, 0.5C, 1C, 3C, 5C, 10C and 20C, the specific capacities of the material are 181, 168, 162, 155, 143, 136, 126 and 113 mA·h/g, respectively.The Na-doping method is facile and feasible, which can provide some valuable reference for synthesizing other high rate and high capacity layered anode/cathode oxides.关键词
钠掺杂正极材料/锂离子扩散通道/电化学性能/锂离子电池Key words
Na-doped cathode material/Li+ diffusion path/Electrochemical performance/Lithium-ion battery分类
化学化工引用本文复制引用
郑卓,吴振国,向伟,滑纬博,郭孝东..Na+掺杂锂离子电池正极材料 LiNi0.6Co0.2Mn0.2O2的制备及电化学性能[J].高等学校化学学报,2017,38(8):1458-1464,7.基金项目
国家自然科学基金(批准号: 21506133)资助.Supported by the National Natural Science Foundation of China(No.21506133). （批准号: 21506133）
