材料工程2017，Vol.45Issue(11)：49-57,9.DOI:10.11868/j.issn.1001-4381.2015.001257
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
Fabrication and Electrochemical Performance of LiNi0.5Co0.2Mn0.3O2 Coated with Nano FePO4 as Cathode Material for Lithium-ion Batteries
摘要
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 LiNi0.5 Co0.2Mn0.3O2 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.关键词
磷酸铁/正极材料/LiNi0.5Co0.2Mn0.3O2/包覆Key words
FePO4/cathode material/LiNi0.5Co0.2Mn0.3O2/coating modification分类
化学化工引用本文复制引用
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):49-57,9.基金项目
国家自然科学基金项目(51764029) （51764029）
云南省自然科学基金项目(2014FA025) （2014FA025）
