【摘要】 利用电解二氧化锰(EMD)和碳酸锂为原料,采用熔融浸渍法合成了尖晶石型锂锰氧化物LiMn2O4,并用热重分析(TGA)、粉末X射线衍射技术研究了合成条件对产物的晶体结构、电化学性能的影响。研究结果表明,在合成的后续阶段反应时间的长短对产物的晶体结构和电化学性能的影响很大,时间长,会使LiMn2O4分解为Li2MnO3和Mn2O3;LiMn2O4的初始放电比容量也随反应时间的延长而下降。在最佳条件下合成的LiMn2O4的首次放电比容量高达132.4mAh/g,50次循环后的放电比容量还保持在125.6mAh/g的水平。更多还原

【Abstract】 Spinel LiMn2O4 samples were prepared by melt-impregnation method. The effects of synthesis conditions on the electrochemical properties and crystal framework were investigated extensively. The results show that the reactive time in the second process affects the structure and electrochemical properties. The capacity decreases with prolonging reactive time. The optimum LiMn2O4 possesses an initial discharge capacity of 132.4mAh/g and good rechargeability. No remarkable loss of capacity was observed even after 50 cycles.更多还原