SiO2表面包覆锂离子电池阴极材料LiMn2O4及对其性能影响研究

锰酸锂（LiMn2O4）是作为目前性价比最高的商业化锂离子电池正极材料，成为近年来电池研究的热点。但该材料在高温时，由于Mn离子较易溶解于电解液中，制约其广泛应用。本研究中，采用SiO2对其表面进行包覆，减少了活性材料与电解液的直接接触。并通过x-射线衍射、扫描电镜（SEM）、充放电循环测试对合成产物的组成、结构、形貌和电化学性能进行表征，进而研究影响产品的高温性能的主要因素，并筛选出较为合适的改性条件以提高锂电池正极材料LiMn2O4的电化学性能。

Research on Surface Modification of Lithium-ion Battery Cathode Material LiMn2O4 by Coating SiO2 and Difference on Their Electrochemical Performance

Lithium manganese oxide, as a future cathode material for Li-ion batteries, has become one of most focused material in recent years. But its poor high-temperature performance hinders its further application. In this research, SiO2 was used to modify the surface of this material. And X-ray diffraction （XRD）, scanning electron microscopy （SEM） and charge-discharge test were employed to examine the composition, structure, morphology and electrochemical performance of the modified product, then main factors to affect its high-temperature performance were studied, the suitable modification conditions were determined to improve the electrochemical performance of lithium nickel-manganese oxide （LiMn2O4） in the lithium-ion battery.