橄榄石结构正极材料Li_(1+x)Fe_(0.4)Mn_(0.6)PO_4F_x电化学性能  

Electrochemical properties of olivine-type Li_(1+x)Fe_(0.4)Mn_(0.6)PO_4F_x cathode material

作　　者：耿海龙 吴军[2] 胡博 王振伟 徐艳辉[1,2] 

机构地区：[1]山东齐星新材料科技有限公司,山东邹平256200 [2]苏州大学物理与光电能源学部,江苏苏州215006 [3]湖州创亚动力电池材料有限公司,浙江湖州313000

出　　处：《电源技术》2016年第3期525-526,535,共3页Chinese Journal of Power Sources

基　　金：江苏省自然科学基金项目(BK2009110)

摘　　要：采用高温固相反应方法一步合成了Li1+xFe0.4Mn0.6PO4Fx,考察了烧结时间、F含量对产物电化学性能的影响。初步试验表明,SEM证实样品的颗粒度较大,XRD分析表明无杂质相,相同的加热时间下,x=0.01时的微取代量有利于材料的电化学性能。充放电曲线呈现非对称现象,说明颗粒内部存在过渡金属之间的化学反应。此外还发现,F取代虽然能够提高电化学活性,但是对于循环性能有一定的害处。Li1＋xFe0.4Mn0.6PO4 Fxwas synthesized via high-temperature solid-state reaction method. The influence of the sintering time, F-content on the electrochemistry was investigated. The primarily experiment shows that the particle size is about 0.5（m from SEM measurement. From XRD analysis, no impurity was detected. Small amount of F-doping was effective to improve electrochemistry. An asymmetric phenomenon was found in the chargingdischarging curves, due to the pure chemical reaction between transition metal ions. Although small amount of F-doping was good at the discharge capacity, it was harmful to the cycle stability.

关 键 词：脱嵌锂 锂离子电池 橄榄石结构 非对称现象 

分 类 号：TM912[电气工程—电力电子与电力传动]