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采用恒流充放电方法测量了温度升高导致ＬｉＭｎ２Ｏ４正极容量衰减的情况．发现当环境温度上升到５０℃时，ＬｉＭｎ２Ｏ４电极出现严重的容量损失和性能衰退，充电态的电极受影响的程度最为严重．对电解液的原子发射和红外光谱分析，电极晶相结构Ｘ＿射线衍射及循环伏安实验研究表明：随着温度升高，ＬｉＭｎ２Ｏ４中阳离子混乱度增大形成无序尖晶石结构，锰离子的溶解度迅速增加，电解液出现催化氧化是导致容量不可逆衰减的原因．采用富锂尖晶石材料是抑制ＬｉＭｎ２Ｏ４高温性能下降的一种有效方法
The constant current charge and discharge method was used to measure the increase of cathode temperature caused by LiMn2O4 cathode capacity decay situation. It is found that when the ambient temperature rises to 50 ℃, LiMn2O4 electrode has serious capacity loss and performance degradation, and the charged electrode has the most serious influence. The results of X-ray diffraction and cyclic voltammetry of the crystal structure of the electrode show that the disorder of the cation in LiMn2O4 increases with the increase of temperature, and the disordered spinel structure is formed. The manganese ion The rapid increase in solubility, the catalytic oxidation of the electrolyte is the cause of irreversible attenuation of capacity. The use of lithium-rich spinel material is an effective way to suppress the drop of high temperature performance of LiMn2O4