为进一步提高动力电池正极材料锰酸锂(LiMn2O4)的循环稳定性,通过溶胶-凝胶法用快离子导体La08Sr02MnO3作为包覆材料对LiMn2O4进行表面修饰,探讨了不同包覆量对复合材料电化学性能的影响.采用X射线衍射仪(XRD)、场发射扫描电镜(FESEM)和透射电子显微镜(TEM)对样品的微观结构以及形貌进行表征.结果表明:La0.s Sr0.2 MnO3的包覆并没有改变LiMn2O4晶体结构及空间构型;相比纯的LiMn2O4样品,La0.8 Sr0.2 MnO3包覆后的样品颗粒表面较为粗糙;涂层为薄膜状结构,均匀且完全包覆在LiMn2O4颗粒的表面.利用电化学测试方法测试其电化学性能,测试结果表明,当La0.8 Sr0.2 MnO3包覆量为5％时,具有较好的电化学性能,首次放电比容量为127.4 mA·h/g(0.1 C),25℃循环400次后容量保持率为91.2％,55℃循环100次后容量保持率为91.1％;与未经表面修饰的样品相比,其首次放电比容量为119.1 mA.h/g(0.1 C),400次的容量保持率为61.9％,100次容量保持率为77.9％,La08Sr0.2 MnO3包覆后的样品的电化学性能尤其是循环性能得到明显的提高.
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