【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 .更多还原

【Abstract】 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.更多还原