LiMn_2O_4正极材料高温固相合成工艺的优化

用正交实验,通过XRD、SEM及电化学性能分析,优化了锂离子电池正极材料LiMn2O4的高温固相合成工艺。对产物性能影响的顺序为:锂锰物质的量比烧结温度恒温时间。在n(Li)∶n(Mn)=0.525∶1.000、烧结温度为820℃及恒温时间为14 h时,合成的LiMn2O4的综合性能最好,尖晶石结构和表面形貌良好,1C首次放电比容量为119.0 mAh/g,第50次循环的容量保持率为95.8%。

Optimization of high-temperature solid-phase synthesizing process for cathode material LiMn_2O_4

Using the orthogonal experiment,the high-temperature solid-phase synthesizing process for Li-ion battery cathode material LiMn_2O_4 was optimized by XRD,SEM and electrochemical performance analyses. The order of influencing the performance of the products was:molar ratio of lithium to manganese>sintering temperature>thermostatic time. The LiMn_2O_4 synthesized at n(Li):n(Mn)=0.525:1.000,820 ℃ of sintering temperature and 14 h of thermostatic time had the best comprehensive performance. It had fine spinel structure and surface morphology,the initial specific discharge capacity at 1 C was 119.0 mAh/g,the capacity retention rate at the 50th cycle was 95.8%.