锆掺杂对正极材料LiMn_2O_4性能的影响

Effects of Doping Element Zirconum on Performance of LiMn_2O_4 Cathode Material

采用溶胶-凝胶法在合成尖晶石型锰酸锂的过程当中掺入不同比例的锆元素,采用SEM观察其晶体结构均完整,通过XRD谱图可以看出均具有尖晶石结构。通过对样品进行充放电测试,结果表明:当掺杂剂的量(X=0.1),即化学式LiZr0.1Mn1.9O4具有良好的高温(55℃)循环性能,在高温(55℃)和1 C倍率充放电下,循环50次后容量保持率为90%。

In the process of preparing LiMn2O4 with spinel structure by gel-method,different proportions of Zirconum element were mixed.The crystal structure observed by SEM was complete and spinel structure by XRD.By the charge-discharge test of samples,the result showed when the amount of dopant was x=0.1,LiZr0.1Mn1.9O4 had well cycle performance at high temperature（55 ℃）.At high temperature（55 ℃） and 1C rate,the capacity retaining was 90% after 50 cycles.