LiMn2O4的Al2O3室温固相包覆及其电化学性能研究

首次采用一种室温固相法对LiMn2O4进行Al2O3表面包覆。采用X射线衍射（XRD），扫描电镜（SEM）技术对产物的结构和形貌进行了表征，同时对其电化学性能进行了检测。结果表明，通过表面包覆，LiMn204材料的循环性能，特别是高温循环性能，得到了有效的改善。在3．25～4．35V的充放电电压区间内，表面包覆AlE0，质量分数为1％所制备的LiMn2O4材料显示出优良的电化学性能，在25℃和55℃，分别可达到0．5C 120．2mAh／g和117．9mAh／g，经过50次循环后容量保持率分别为96．59％和94．23％。

Electrochemical Performance of Al_2O_3-coated LiMn_2O_4 Cathode Materials by Solid-state Reaction at Room Temperature

Preparation of Al2O3-coated LiMn2O4 cathode materials by solid-state reaction at room temperature was described.The crystal structure,morphology and the electrochemical performance of the LiMn2O4 cathode materials were investigated by x-ray diffraction,scanning electron microscopy and electrochemical measurements.It is found that LiMn2O4 cathode materials have excellent cycleability by Al2O3 coating,specially at high temperature.The initial discharge capacity of the materials with 1.0wt% Al2O3-coated were 1...