金属氧化物包覆LiMn_2O_4的红外光谱及光电子能谱研究  

Fourier Transition Infrared Spectroscopic and X-ray Photoelectron Spectroscopic Studies on Metal Oxide-coated LiMn_2O_4

作　　者：吴川[1] 吴锋[1] 白莹[1] 

机构地区：[1]北京理工大学化工与环境学院

出　　处：《光散射学报》2005年第4期396-401,共6页The Journal of Light Scattering

基　　金：国家"973"计划资助(项目编号2002CB211800)

摘　　要：本文采用溶液化学的方法,在锂离子电池正极材料LiMn2O4上包覆一层金属氢氧化物前驱体,再通过热处理得到稳定的金属氧化物包覆层。傅立叶红外光谱(FIIR)的研究表明,当包覆LiMn2O4中外来金属原子的实际百分比小于1.11%时,不能探测到包覆层红外信号。X射线光电子能谱(XPS)的研究表明,表面包覆层中Al或Mg的存在不仅削弱Mn-O键的作用,而且给体系引入过多的正电荷,导致Mn(2p)结合能的降低。包覆层中的Al2O3和MgO均在加热过程中向LiMn2O4体相中扩散;而包覆层中的SnO2在焙烧后并未进入LiMn2O4晶格内,而是附着于其表面。Metal hydroxides layers were coated on LiMnzO4 via a solution chemical method, and metal oxide - coated LiMnEO4 was obtained by subsequent heat- treating. Fourier Transition Infrared （FTIR） analysis shows that the coating layer can＇t be detected when the ratio of introduced metal atom is less than 1.11%. X - ray Photoelectron Spectroscopic （XPS） results indicates that Al and Mg in the coating layer weaken the interaction of Mn - O bonds, and in- troduce excessive positive electrical charge, result in the decrease of Mn （2p） binding energy. Additionally, Al2O3 and MgO in the coating layer will diffuse into LiMn2O4 body phase, while SnOz particles are all coated on LiMn2O4 surface.

关 键 词：锂离子电池 LIMN2O4 金属氧化物 傅立叶红外光谱 X射线光电于能谱 

分 类 号：O657.33[理学—分析化学]