碳酸盐共沉淀法制备LiNi_(0.5)Mn_(0.5)O_2  

Synthesizing of layered cathode material of LiNi_(0.5)Mn_(0.5)O_2 by carbonate co-precipitation method

作　　者：刘元刚 徐强[2] 李红[2] 张联齐[3] 

机构地区：[1]天津市科技工作者创新创业服务中心,天津300041 [2]天津大学化工学院,天津300072 [3]天津理工大学材料科学与工程学院,天津300384

出　　处：《电源技术》2015年第3期464-465,505,共3页Chinese Journal of Power Sources

摘　　要：采用碳酸盐共沉淀法制备了LiNi0.5Mn0.5O2正极材料。研究了原料中不同锂含量对电极性能的影响。材料分析结果表明,碳酸盐共沉淀法合成的LiNi0.5Mn0.5O2材料中Ni和Mn分布均匀,离子混排小,结构有序。充放电测试结果表明,原料中过量锂的存在极大地改善了LiNi0.5Mn0.5O2材料的循环性能和倍率性能。在2.5~4.5 V的电压范围内,原料中锂未过量的LiNi0.5Mn0.5O2电极首次和80次循环后的放电比容量分别为190.3和153 m Ah/g。当原料中锂过量10%时,LiNi0.5Mn0.5O2电极首次和80次循环后的放电比容量分别为180.2和174.6mAh/g,两种电极的容量保持率分别为80.4%和96.9%。当以4C放电时,未过量和过量10%锂的LiNi0.5Mn0.5O2电极的放电比容量分别为91和100mAh/g。The cathode material of LiNi0.5Mn0.5O2 was prepared by the carbonate coprecipitation. The effect of different feed ratio of lithium on the electrochemical performance of LiNi0.5Mn0.5O2 was also studied. The analitical results show that the LiNi0.5Mn0.5O2 has an ordered structure with a little confusion of ion position in the lattice and the distribution of Ni and Mn is uniform. The results of charge-discharge tests show that the lithium excess in the feed ratio has greatly improved both the cyclic performance and the rate capability of LiNi0.5Mn0.5O2.The discharge specific capacities of the LiNi0.5Mn0.5O2 for the first time and after 80 cycles were 190.3 and 153 m Ah/g in the range of 2.5-4.5 V,respectively. The discharge specific capacities of the LiNi0.5Mn0.5O2（lithium excess 10%） for the first time and after 80 cycles were 180.2 and 174.6 m Ah/g in the range of 2.5-4.5 V, respectively. The capacity retention ratios of LiNi0.5Mn0.5O2 and LiNi0.5Mn0.5O2（lithium excess 10%） were 80.4% and 96.9%, respectively. The discharge specific capacities of LiNi0.5Mn0.5O2 and LiNi0.5Mn0.5O2（lithium excess 10%） at a current of 4 C were 91 and 100 m Ah/g,respectively.

关 键 词：LINI0.5MN0.5O2 碳酸盐共沉淀法 锂离子电池 正极材料 

分 类 号：TM912[电气工程—电力电子与电力传动]