以尖晶石LiMn2O4,Li2CO3和Co3O4为原料,采用固相烧结法合成了尖晶石锰酸锂的改性产物.X射线粉末衍射分析表明,改性产物保持了LiMn2O4的立方尖晶石结构.采用Rietveld方法进行结构精修表明,掺杂元素进入了晶胞中的16d位置,改性产物结构分子式可写成[Li]8a[Mn2-xLix/4Co3x/4]16d[O4]32e.随着钴和锂掺杂量的增加,产物16d位置中更多的锰被取代,锰离子平均价态逐渐升高,锰和氧的结合键能增加,键长下降,晶格参数减小.电性能测试表明,锰酸锂掺杂钴、锂后,循环稳定性提高,比容量稍有降低.当锂、钴掺杂量为锰酸锂的0.025倍时,综合性能最佳.
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