锂离子电池正极材料LiMn_(2-x)Cr_xO_4电化学性能的研究  

Electrochemical Properties of LiMn_(2-x)Cr_xO_4 as Cathode Materials of Lithium Ionic Batteries

作　　者：傅强[1] 陈彬[1] 黄小文[1] 谢忠巍[1] 何兴权[1] 孙海珠[1] 谢德民[1] 

机构地区：[1]东北师范大学化学学院,长春130024

出　　处：《高等学校化学学报》2004年第1期128-130,共3页Chemical Journal of Chinese Universities

基　　金：吉林省科技厅 (批准号 :吉科合字第 2 0 0 0 0 13 3号 )资助

摘　　要：针对尖晶石型 Li Mn2 O4 锂离子电池正极材料的容量衰减 ,提出了相应的抑制方法 ,所合成的L i Mn2 - x Crx O4( 0 <x≤ 0 .2 )虽然首次放电容量有所减小 ,但循环性能得到改善 .To improve the specific of lithium ion batterise, main effort should be directed toward the synthesis of new positive electrode materials, i.e. various lithiated oxide that could reversibly intercalate one Li atom per 3d-metal atom at about 4 V %versus% Li. Spinel lithium manganese oxide(LiMn 2O 4) attracted interest because of its economical and environmental advantages compared to other lithiated transition metal oxide such as lithium cobalt oxide(LiCoO 2) or lithium nickel oxide(LiNiO 2). However, efforts to substitute LiMn 2O 4 for LiCoO 2, in commercial Li-ion batteries have not been successful due to the rapid capacity fade upon cycling. This capacity fading has been suggested to be due to spinel dissolution, the Jahn-Teller effect and lattice instability. In the paper, doped LiMn 2-xCr xO 4 compounds(0<x≤0.2) were synthesized. Though LiMn 2-xCr xO 4 has a lower specific discharge capacity than that of LiMn 2O 4, it show the best cycle performance, the improvement of cycle performance is attributed to the stabilization of the spinel structure.

关 键 词：锂离子电池 正极材料 LiMn2-xCrxO4 电化学性能 锂锰氧化物 容量衰减 掺杂 

分 类 号：TM912.2[电气工程—电力电子与电力传动] O646[理学—物理化学]