采用溶液沉积及快速退火制备了不同厚度的LiMn2O4薄膜,用X射线衍射及扫描电子显微镜检测分析薄膜的物相及形貌;采用恒电流充放电及交流阻抗技术研究了LiMn2O4薄膜的电化学性质.结果表明,制备的LiMn2O4薄膜均匀,晶粒大小相近,晶粒尺寸在20～50 nm之间.经热处理后LiMn2O4薄膜断面清晰,薄膜与基片之间扩散很轻微.随着薄膜厚度的增加,薄膜的粗糙度减小,平整度变好.不同厚度的LiMn2O4薄膜的比容量介于42～47 μAh/(cm2·μm)之间,经50次循环后,薄膜的容量损失率从0.18 μm的0.64%上升到1.04 μm的9.0%,循环性能随着薄膜厚度的增加而变差.电化学阻抗测试表明不同厚度的LiMn2O4薄膜锂离子扩散系数差别不大,数量级为10-11cm2/s.
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