Li含量对Li_(1+x)[Ni_(0.35)Mn_(0.65)]O_2性能的影响  

Effects of lithium content on the performance of Li_(1+x)[Ni_(0.35)Mn_(0.65)]O_2

作　　者：周春仙[1] 廖达前[1] 郭忻[1] 习小明[1] ZHOU Chun-xian LIAO Da-qian GUO Xin XI Xiao-ming(Changsha Research Institute of Mining and Metallurgy Co. , Ltd. , Changsha, Hunan 41 O012, China)

机构地区：[1]长沙矿冶研究院有限责任公司,湖南长沙410012

出　　处：《电池》2016年第5期263-266,共4页Battery Bimonthly

基　　金：国家科技部转制科研院所创新能力专项经费(2014EG113173)

摘　　要：采用高温固相法合成Li1＋x[Ni0.35Mn0.65]O2（x=0.35、0.40、0.45和0.50）富锂锰基正极材料,进行XRD、SEM、电化学阻抗谱（EIS）分析和电化学性能测试。所得材料具有α-NaFeO2层状结构,一次颗粒为类球形,平均粒径约为500 nm,最佳x值为0.45。x=0.45的材料于25℃时在2.04.8 V充放电,0.05 C首次放电比容量和首次循环的库仑效率分别为227.7 m Ah/g和71.7%,1.00 C最高放电比容量为182.6 m Ah/g。EIS测试表明：材料组装的电池的电荷转移阻抗较低。Lithium riched manganese based cathode materials Li1＋x[Ni0.35Mn0.65]O2 （ x = 0. 35,0. 40,0. 45 and 0. 50 ） were synthesized by high temperature solid state method. XRD, SEM, electrochemical impedance spectroscopy （EIS）analyses and electrochemical performance test were taken. The structure of obtained material was α-NaFeO2. The morphology of the primary particle with a average size about 500 nm was spherical, the optimal x value was 0. 45. When material of optimal x value with 0. 45 was assembled into coin cells and tested with 0.05 C in 2.0 - 4. 8V, the initial specific discharge capacity was 227.7 mAh/g and the coulombic efficiency in initial cycle was 71.7%. When discharged at 1.00 C,the highest specific discharge capacity was 182.6 mAh/g. Low charge transfer resistance of the cell assembled with optimal material was obtained when EIS was tested.

关 键 词：锂离子电池 正极材料 Li1+x[Ni0.35Mn0.65]O2 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]