Zn掺杂对LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2结构与电化学性能的影响  

Effect of Zn Doping on the Structure and Electrochemical Performance of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2

作　　者：毛新钰[1] 梁小平[1] 刘建[1] 李冬梅[1] 左蕊[1] 刘铠[1] 罗大军[1] 王瑞雪[1] 

机构地区：[1]天津工业大学中空纤维膜材料与膜过程省部共建国家重点实验室培育基地,天津300387

出　　处：《稀有金属材料与工程》2015年第3期743-747,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51102174)

摘　　要：用溶胶凝胶法制备了Li Ni1/3Co1/3-x Mn1/3Znx O2(x=0,1/24,2/24,4/24)锂离子电池正极材料。由X射线衍射和扫描电镜对其分析结果表明,Zn掺杂不改变Li Ni1/3Co1/3Mn1/3O2的α-Na Fe O2层状结构,当掺杂量达到4/24时,杂相产生。电化学研究表明,当Zn掺杂量为2/24时,Li Ni1/3Co1/3Mn1/3O2首次放电容量由未掺杂的169.2 m Ah·g-1降低为160.1m Ah·g-1,但循环性能明显提高,30次循环后的容量保持率由未掺杂的89.2%升至97%。并且在20、40、60和80 m A·g-1不同的电流密度下继续循环20次后,当再次恢复到20 m A·g-1的电流密度时,放电容量可恢复到150.3 m Ah·g-1。Li Ni1/3Co1/3-x Mn1/3Znx O2（x=0, 1/24, 2/24 and 4/24） cathode material for lithium-ion battery was synthesized by a sol-gel method.The results of XRD and SEM show that Zn doping does not change the α-Na Fe O2 layer structure of Li Ni1/3Co1/3Mn1/3O2, and impurity phases occur when the doped amount reaches 4/24. Electrochemical studies indicate that when the doped Zn content is 2/24, the initial discharge capacity of Li Ni1/3Co1/3Mn1/3O2 decreases from 169.2 m Ah·g-1 of the undoped material to 160.1 m Ah·g^-1. The cycling performance, however, is significantly improved. Compared with undoped material, the capacity retention rate of the sample of Li Nil/3Col/3-x Mnl/3Znx O2 with x=2/24 increases from 89.2% to 97% after 30 cycles. The same sample was charged and discharged again at20 m A·g-1 and the corresponding discharge specific capacity was restored to 150.3 m Ah·g-1 after 20 cycles in different current densities of20, 40, 60 and 80 m A·g^-1.

关 键 词：锂离子电池 LiNi1/3Co1/3Mn1/3O2正极材料 溶胶凝胶法 Zn掺杂 

分 类 号：TM912[电气工程—电力电子与电力传动]