正极材料Li_xMn_2O_4的合成及电化学性能研究  

Study on Synthesis and Electrochemical Properties of Positive Electrode Material Li_xMn_2O_4

作　　者：宋力[1] 程翠霞[2] 刘浩文[3] 张克立[3] 

机构地区：[1]信阳师范学院化学化工学院,信阳464000 [2]湖北省黄石市第五中学化学教研组,黄石435000 [3]武汉大学化学与分子科学学院,武汉430072

出　　处：《化工进展》2004年第4期389-392,共4页Chemical Industry and Engineering Progress

摘　　要：采用流变相反应法以不同配比的乙酸锂、乙酸锰及柠檬酸为原料合成正极材料LixMn2 O4。经X射线衍射表征 ,热重分析 (TG)和差热分析 (DTA)以及电化学性能测试表明 :LixMn2 O4结晶性能很好 ,为尖晶石结构 ;材料随着n(Li)∶n(Mn)摩尔比增大起始放电量增大 ,而电池的效率却逐渐减少 ,2 0次循环后富锂正极材料的放电量低于缺锂正极材料。试验表明 :在非化学计量尖晶石结构LixMn2 O4中锂的用量 ,是影响电池的初始容量及循环寿命的关键因素之一。We have synthesized the Positive Electrode Material Li 1+xMn 2O 4 by rheological phase reaction method from lithium acetate, manganese acetate and citric acid.The structural and electrochemical performance of the material was studied by XRD、TG、DTA and electrochemical measurements.The results show that the synthesized Li xMn 2O 4 have good crystal with a structure of spinel.The electrode of Li xMn 2O 4 shows that the first charge capacity increases with the increase of n(Li)∶n(Mn) mole ratios, but efficiency of battery decreases. After 20 cycles, the discharge capacity of the rich of lithium material was obviously less than the lack of lithium material.The experiments show that in the out of electrochemical parameters of Li xMn 2O 4, excess Li was one of the most important factor that affect battery's first charge capacity and cyclic lifetime.

关 键 词：锂离子电池 正极材料 LIXMN2O4 合成 电化学性能 尖晶石结构 流变相法 

分 类 号：TM912[电气工程—电力电子与电力传动]