聚阴离子型锂离子电池正极材料LiMnPO_4的研究进展  

Progress in Polyanion-type Li-ion Batteries Cathode Materials LiMnPO_4

作　　者：王连建[1] 葛春华[2] 郭林[1] 

机构地区：[1]北京航空航天大学化学与环境学院,北京100191 [2]辽宁大学化学院,辽宁沈阳110036

出　　处：《辽宁大学学报（自然科学版）》2013年第2期145-156,共12页Journal of Liaoning University：Natural Sciences Edition

基　　金：国家自然科学基金(11079002)

摘　　要：从LiMnPO4的结构与电化学反应机理、制备方法及稳定性方面对锂离子电池正极材料LiMnPO4进行了介绍.针对LiMnPO4的制备方法进行了详细的概述,并分析了这些制备方法的优缺点.橄榄石型结构的LiMnPO4与LiFePO4具有比较接近的理论比容量,而LiMnPO4的氧化还原电位较高,约4.1 V(vs Li/Li+),同样条件下能够提供较高的比能量.但LiMnPO4的电子和离子电导率较低,直接导致了材料的电化学性能较差,这就限制了其实际应用.人们付出了很大的努力致力于提高该材料的电化学性能,如通过不同的合成方法减小材料的尺寸至纳米级,包碳,球磨,阳离子掺杂等.掺杂和包覆导电碳被认为是获得性能优良的LiMnPO4的有效方法.The structure and electrochemistry reaction mechanism,synthesis method and the stability of lithium ion battery cathode material LiMnPO4 were introduced.The advantages and disadvantages of these detailed preparation methods were analyzed.The theoretical specific capacity of olivine-type LiMnPO4 is close to that LiFePO4,however,the oxidation reduction potential of LiMnPO4 is about 4.1 V(vs Li/Li+),which is higher than that of LiFePO4.At the same conditions,LiMnPO4 can provide higher energy.Electronic and ionic conductivity of LiMnPO4 is low,leading to a poor electrochemical performance.Great efforts have been made to improve the electrochemical performance of materials,such as reducing the size of the material to the nanometer level via different synthetic methods,carbon coating,ball milling,cation doping,etc.Doping and coating conductive material are reported effective method to improve performance of LiMnPO4.

关 键 词：磷酸锰锂 锂离子电池 橄榄石结构 电化学性能 合成方法 

分 类 号：O646[理学—物理化学]