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锂离子蓄电池正极材料LiMn₂O₄——包覆LiCoO₂对LiMn₂O₄循环性能的影响

LiMn₂O₄ as cathode material for lithium ion batt eries——Effect of LiCoO₂ coating on cycling performance of LiMn₂O₄

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【Author】 CHEN Jing-bo1, HU Guo-rong2, YU Xiao-yuan2, PENG Zhong-dong2, CHEN Ya n-ling3(1.The Graduate School of China U niversity of Geosciences, Wuhan Hubei 43 0074, China; 2.College of Metallurgy Science and Eng ineering, Central South University, Chan gsha Hunan 410083, China; 3.College of Material Sciences and Chemi cal Engineering, China University of Geo sciences, Wuhan Hubei 430074, China)

【机构】中国地质大学研究生院；中南大学冶金学院；中国地质大学材料科学与化学工程学院湖北武汉430074；湖南长沙410083；湖北武汉430074；

【摘要】将LiMn2O4置于LiAc和CoAc2的混合溶液中,缓慢蒸干溶液,煅烧后获得了包覆LiCoO2的LiMn2O4材料。通过电化学测试研究了钴的包覆量、煅烧温度、煅烧时间对包覆LiCoO2的LiMn2O4材料循环性能的影响,并比较了包覆Li CoO2前后,LiMn2O4材料分别在常温和高温环境下循环性能的差异。实验结果表明,在LiMn2O4的表面包覆LiCoO2,可以使LiMn2O4在常温和高温环境下获得良好的循环性能。更多还原

【Abstract】 The LiCoO2-coat ed LiMn2O4 material was prepared by pu tting LiMn2O4 into the solution contai ning LiAc and CoAc2, and vaporized the solution slowly, then calcined the mixtu re. The effects of LiCoO2 coating amoun t, calcination temperature and calcinati on time on the cycling performance of Li CoO2-coated LiMn2O4 were investigated by means of electrochemical tests. The differences of the cycling performance o f pure LiMn2O4 and LiCoO2-coated LiMn 2O4 materials at normal and elevated t emperature were also compared. The exper imental results show that the cycling pe rformance of LiMn2O4 at normal and ele vated temperature can be improved by coa ting LiCoO2.更多还原