Cr^(3+)掺杂LiNi_(0.5)Mn_(1.5)O_4材料的制备及性能  

Synthesis and Performance Study of Cr-doped LiNi_(0.5)Mn_(1.5)O_4 Cathode Material

作　　者：李军[1] 李少芳[1] 李庆彪[1] 朱建新[1] 刘建军[1] 

机构地区：[1]广东工业大学,广东广州510006

出　　处：《稀有金属材料与工程》2017年第11期3458-3463,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(20672023);广州市科技计划项目(2011Y1-00010);广东省科技计划项目(2012B050100010)

摘　　要：采用高温固相法合成了Cr^(3+)掺杂的LiNi_(0.5)Mn_(1.5)O_4正极材料,研究了掺杂量对材料物理性能和电化学性能的影响。利用XRD、SEM对材料的结构和形貌进行了表征。结果显示,样品具有棱边清晰的尖晶石形貌。讨论了不同Cr^(3+)掺杂量对LiCrxNi_(0.5-0.5x)Mn_(1.5-0.5x)O_4(x=0,0.05,0.1,0.15,0.2)正极材料性能的影响。充放电测试、循环伏安和交流阻抗测试结果表明:当Cr^(3+)的掺杂量为x=0.1时(LiCr_(0.1)Ni_(0.45)Mn_(1.45)O_4)正极材料的性能最好,0.1、0.5、1、2及5 C的首次放电比容量依次为131.54、126.84、121.28、116.49和96.82 mAh·g^(-1),1 C倍率下循环50次,容量保持率仍为96.5%。The Cr^3＋ doped LiNi_（0.5）Mn_（1.5）O_4 cathode material were synthesized by a solid-state method. In the meantime, the effect of doping amount into cathode material on its physical and electrochemical properties was studied. The structure and morphology of cathode material were characterized by X-ray diffraction and SEM, respectively. The results show that the sample exhibits the clear edge of spinel. The effect of different Cr^3＋ doping amounts on the property of LiCrxNi_（0.5-0.5x）Mn_（1.5-1.5x（O_4（x=0, 0.05, 0.1, 0.15, 0.2） cathode materials was discussed. The galvanostatic charge-discharge, CV and EIS test results suggest that electrochemical properties of LiCr_（0.1）Ni_（0.45）Mn_（1.45）O_4 are the best when the Cr^3＋ doping amount is 0.1. At discharge rates of 0.1, 0.5, 1, 2 and 5 C, the specific capacities of the samples are 131.54, 126.84, 121.28,116.49 and 96.82 mAh·g^（-1）, respectively. At 1 C after 50 cycles, the capacity retention rate is 96.5%.

关 键 词：LI Ni0.5Mn1.5O4 Cr^3+掺杂 正极材料 倍率性能 循环性能 

分 类 号：TM912[电气工程—电力电子与电力传动]