摘要
尖晶石LiMn2O4是很有发展前途的锂离子电池正极材料,但它在循环过程中存在着容量衰减的问题,其中Jahn-Teller效应是锂离子电池正极材料尖晶石LiMn2O4在应用中容量衰减的难点。对溶胶凝胶法制备的尖晶石LiMn2O4,及其阳离子掺杂LiMxMn2-xO4(M=Li,Ni-Co)正极材料进行了表面改性(包覆MgO),利用x射线衍射、晶格参数和｜Mn4+｜/｜Mn3+｜比值等参数研究了尖晶石LiMn2O4的Jahn-Teller效应。结果表明:表面改性后的正极材料Li1.05Mn1.9Co0.05Ni0.05O4循环性能明显增强,Jahn-Teller效应得到了有效抑制。
Spinel LiMn2O4 is one of the most promising cathode materials for lithium-ion batteries. However, there are some problems in use of this material. One of them is the capacity fading after cycling. The Jahn-Teller effect of the major factors led to the capacity fading of spinel LiMn2O4. The grains of LiMn204 and LiMxMn2-xO4（M = Li, Ni - Co） were coated with MgO by using sol-gel process. The Jahn-Teller effect of spinel LiMn204 had been researched by XRD measurement, lattice constants and rate of ｜Mn4^＋｜ /｜Mn^3＋｜ etc. The results showed that the surface treatment waseffective to improve the cycle ability of spinel Li1.05Mn1.9Co0.05Ni0.05O4 cathode materials and the Jahn-Teller effect was inhibited.
出处
《电池工业》
CAS
2006年第6期388-391,400,共5页
Chinese Battery Industry
基金
安徽省教育厅自然科学研究项目(050601D2)
