采用溶胶-凝胶技术在富锂锰基固溶体Li1.2Mn0.54Co0.13Ni0.13O2表面包覆V2O5,制备了Li1.2Mn0.54Co0A3Ni0.13O2@V2O5核壳复合材料.通过扫描电镜(SEM)和透射电镜(TEM)观察其形貌,X射线衍射(XRD)分析确定其结构.结果显示,结晶态的V2O5均匀包覆在类球形Li1.2Mn0.54Co0.13Ni0.13O2颗粒表面,Li1.2Mn0.54Co0.13Ni0.13O2材料的晶体结构在包覆前后保持不变.X射线光电子能谱(XPS)分析结果表明,该核壳复合材料首次充电时,锂离子嵌入V2O5包覆层.电化学测试结果表明,表面包覆15％V2O5的核壳复合材料具有最佳的电化学性能:0.1C倍率下放电比容量为276 mAh/g,首次充放电库仑效率达到94％,50次循环后容量保持率达89％.
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