高电压电池储存性能及其容量衰减研究  

Study on storage performance and capacity loss of high voltage battery

作　　者：朱广燕[1] 刘三兵[1] 裴峰 陈效华[1] 

机构地区：[1]奇瑞汽车股份有限公司,安徽芜湖241009 [2]江西省电力科学院,江西南昌330096

出　　处：《电源技术》2015年第4期680-681,735,共3页Chinese Journal of Power Sources

基　　金：国家电网公司<电动汽车动力电池梯次利用技术研究与示范>课题资助

摘　　要：以Li Ni0.5Mn1.5O4为正极、石墨为负极,制作Li Ni0.5Mn1.5O4/C全电池。并且利用X射线衍射光谱法(XRD)、循环伏安(CV)、能谱仪(EDS)等分析检测手段研究了储存前后的电极活性物质结构和表面状态的变化,测试Li Ni0.5Mn1.5O4电池储存前后电化学性能,并研究了不同荷电态储存后电池容量衰减情况及其相关机理。研究表明,满电态储存后容量衰减最大,达到14.1%,25%荷电态储存后容量衰减最小,为5.9%。X射线衍射光谱法(XRD)结果表明,储存后Li Ni0.5Mn1.5O4尖晶石结构发生一定程度的塌陷;Ni2+和Mn4+发生溶解,并在负极析出;循环伏安测试结果表明,储存后电极极化增大。The LiNi0.5Mn1.5O4/C batteries were fabricated with LiNi0.5Mn1.5O4 as cathode and graphite as anode. The structure and surface morphology change of the electrode materials before and after storage were characterized by X-ray diffraction （XRD）, cyclic voltammograms （CV） and energy dispersive spectrometer（EDS）. The electrochemical performances of LiNi0.5Mn1.5O4 battery before and after storage were tested. The capacity loss and mechanism after storage with different charged state were studied. The results show that the capacity loss ratio at ful charged state is the highest of 14.1%, while the ratio at 25%charged state is the lowest of 5.9%. XRD results show that the spinel structure of LiNi0.5Mn1.5O4 is destroyed after storage. The Ni^2＋and Mn^4＋are dissoluted and deposited on the anode. The CV results show that the polarization of LiNi0.5Mn1.5O4 electrode increases after storage.

关 键 词：LINI0.5MN1.5O4 储存性能 容量衰减 

分 类 号：TM912.9[电气工程—电力电子与电力传动]