LiMn_2O_4的制备及其电化学性能研究

Preparation and electrochemical property of LiMn_2O_4

通过一种全新的固相法合成尖晶石LiMn_2O_4,先制得Mn_3O_4,再由制得的Mn_3O_4和LiCO_3合成LiMn_2O_4正极材料。对由此方法得到的尖晶石LiMn_2O_4的结构和电化学性能进行了研究。通过X射线衍射仪（XRD）和电子扫描电镜（SEM）分析表明,所制材料为纯相尖晶石LiMn_2O_4,颗粒均匀,无杂质相;通过电化学性能测试表明,该尖晶石LiMn_2O_4具有良好的电化学性能：首次充放电比容量为120.7mAh/g（0.5C,3.5~4.3V）,经过100次充放电循环后,放电比容量为118mAh/g,容量保持率为97.8%。

A new solid phase synthesis of LiMn_2O_4 was intruduced.First made the Mn_3O_4,then Li_2CO_3 and precursor Mn_3O_4 were mixed together and incinerated to prepare spine1LiMn_2O_4.Structure and electrochemical properties of the spinel LiMn_2O_4 were studied.The LiMn_2O_4 were characterized by XRD,and SEM.Test results showed that the material system had stable spinel structure,uniform particles and without impurities.Electrochemical property tests showed that the spinel LiM n204 had excellent eletroehemical properties.The first discharge specific capacities of LiMn_2O_4 was 120.7mAh/g（0.5C,3.5~4.3V）,The discharge specific capacities could still retain about 118mAh/g after 100 cycles,capacity retention rate was 97.8%.