Co掺杂对富锂锰基正极材料Li1.2Ni0.2Mn0.6O2电化学性能的影响  

Effect of Co Doping on the Electrochemical Properties of Li_(1.2)Ni_(0.2)Mn_(0.6)O_2 Rich Lithium Manganese Based Cathode Materials

作　　者：杨陈 向延鸿[1,2] 章顺坤 龙博 陈经玲 唐淑敏 唐欢 廖启军 田林 YANG Chen;XIANG Yan-hong;ZHANG Shun-kun;LONG Bo;CHEN Jin-lin;TANG Shu-min;TANG Huan;LIAO Qi-jun;TIAN Lin(School of Physics and Mechanical Engineering, Jishou 416000, China;The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Thechnology( the 2011 Plan of Hunan Province) , Jishou 416000, China)

机构地区：[1]吉首大学物理与机电工程学院,吉首416000 [2]锰锌钒产业技术湖南省2011协同中心,吉首416000

出　　处：《人工晶体学报》2018年第3期629-634,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51662010,51364009,51262008,51472107,51672104);湖南省自然科学基金(2016116121);湖南省教育厅优秀青年项目(16B209,15B190);吉首大学大学生研究性学习与创新实验计划;吉首大学校级理工科研究项目(Jdxl6008,Jdxl6009)

摘　　要：本文以醋酸盐为原料,采用溶胶凝胶法制备富锂锰基固溶体正极材料Li_(1.2)Ni_(0.2)Mn_(0.6)O_2。研究Co掺杂后对Li1.2Ni0.2-x/2Mn0.6-x/2CoxO2(x=0,0.01,0.02,0.05)材料结构以及电化学性能的影响。XRD和SEM测试表明:Co掺杂后样品结构未发生改变,均属于富锂锰基正极材料。电化学测试表明:Co掺杂能改善材料的倍率性能,提高材料的放电比容量。其中,x=0.02的材料Li1.2Ni0.19Mn0.59Co0.02O2具有最优异的电化学性能,0.05 C下的首次放电比容量由未掺杂的的217 m Ah·g-1提升至332.6 m Ah·g-1;0.1 C下经40次循环后放电比容量为171.6 m Ah·g-1,保持率为85.5%。The paper highlights the method of synthesizing cathode Li1.2Ni0.2Mn0.6O2 materials by sol-gel method with acetates as raw material,and discuss the effect of doping Co on the structure and electrochemical of Li1.2Ni0.2-x/2Mn0.6-x/2CoxO2(x=0,0.01,0.02,0.05)materials.The results of XRD and SEM test show that the structure samples didnt change after Co-doping,and it belong to the lithiumrich manganese based cathode material.The results of electrochemical test shows that Co-doping can improve the rate performance of materials and discharge capacity.It turns that the material with x=0.02 shows the best electrochemical performance,and the first discharge specific capacity increases 115.6 mAh·g-1(from 217 mAh·g-1 to 332.6 mAh·g-1)at the rate of 0.05 C.The discharge capacity is 171.6 mAh·g-1 under 40 cycles and the capacity retention rate of 85.5%at the rate of 0.1 C.

关 键 词：锂离子电池 富锂锰基 正极材料 改性 

分 类 号：TM912[电气工程—电力电子与电力传动]