LiMnPO4/C复合正极材料的固相合成及性能

摘要

采用不同锰源合成LiMnPO4/C复合正极材料,对材料的结构、形貌及电化学性能进行了表征.研究结果表明:以MnC2O4·2H2O为锰源合成的LiMnPO4/C样品颗粒细小均匀,且表现出最好的电化学性能.采用分步活化煅烧法进行了工艺改进,实验结果表明,分步活化煅烧工艺制备的材料颗粒分散,粒径为100 nm左右.材料表现出了良好的放电电压平台,0.05 C放电比容量达到105.3 mA·h/g,说明分步煅烧工艺具有明显的改进效果.%Phase-pure LiMnPO4/C cathode material is synthesized from different manganese source,the structure,morphology and electrochemical properties of the materials have been characterized.Highly crystalline LiMnPO4/C with fine and uniform particle size distribution and present a better reversible discharge capacity is synthesized from MnC2O4 · 2H2O successfully.A stepwise treatment process is used to make modification of the synthesis method.～ 100 nm fine crystalline,uniform particle size distribution and homogeneous carbon coated LiMnPO4/C sample with better electrochemical performance is gotten.It shows a comparable discharge capacity of 105.3 mA · h · g-1at 0.05 C.