锂离子电池正极材料LiMnPO_4的制备及改性研究进展  

Progress in Li-ion batteries cathode materials LiMnPO_4

作　　者：李志军[1] 王红英[1] 汤伟杰[1] 罗大为[2] 

机构地区：[1]深圳职业技术学院工业中心,广东深圳518055 [2]深圳职业技术学院应用化学与生物技术学院,广东深圳518055

出　　处：《电源技术》2015年第3期616-619,共4页Chinese Journal of Power Sources

基　　金：广东省高等学校优秀青年教师培养计划资助项目(Yq2013191);深圳市科技计划项目(JCYJ20130331145557683)

摘　　要：从制备方法及改性研究两方面对锂离子电池正极材料LiMn PO4进行了介绍。综述了LiMn PO4的制备方法,分析了这些制备方法的优缺点。橄榄石型结构的LiMn PO4与LiFe PO4具有比较接近的理论比容量,而LiMn PO4的氧化还原电位较高,约4.10 V(vs.Li/Li+),同样条件下能够提供较高的比能量。但LiMn PO4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,限制了其实际应用。研究人员采取了表面包覆、纳米化、体相掺杂等方式进行改性,该材料的电化学性能得到了巨大的改进。The synthesis method and the modification research of lithium ion battery cathode material LiMn PO4 were introduced. The advantages and disadvantages of these detailed preparation methods were analyzed. The theoretical specific capacity of olivine-type LiMn PO4 was close to the LiFe PO4. However, the oxidation reduction potential of LiMn PO4 was about 4.10 V（vs. Li/Li＋）, which was higher than that of LiFe PO4. At the conditions, LiMn PO4 could provide higher energy. Electronic and ionic conductivity of LiMn PO4 were low, leading to a poor electrochemical performance. Great efforts were 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, cation doping, etc. The electrochemical properties of the material was greatly improved.

关 键 词：锂离子电池 磷酸锰锂 合成方法 改性 

分 类 号：TM912[电气工程—电力电子与电力传动]