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.
作者
周春仙
廖达前
郭忻
习小明
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)
出处
《电池》
CAS
CSCD
北大核心
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)
