| 金属氧化物包覆LiMn_2O_4的红外光谱及光电子能谱研究 |
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| 引用本文： | 吴川,吴锋,白莹.金属氧化物包覆LiMn_2O_4的红外光谱及光电子能谱研究[J].光散射学报,2005,17(4):396-401. |
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| 作者姓名： | 吴川 吴锋 白莹 |
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| 作者单位： | 北京理工大学化工与环境学院,北京,100081;国家高技术绿色材料发展中心,北京,100081 |
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| 基金项目： | 国家“973”计划资助（项目编号2002CB211800） |
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| 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。
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| 关 键 词： | 锂离子电池 LiMn2O4 金属氧化物 傅立叶红外光谱 X射线光电子能谱 |
| 文章编号： | 1004-5929（2005）04-0396-06 |
| 收稿时间： | 2005-01-19 |
| 修稿时间： | 2005-08-22 |
Fourier Transition Infrared Spectroscopic and X- ray Photoelectron Spectroscopic Studies on Metal Oxide- coated LiMn2O4 |
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| WU Chu-an,WU Feng,BAI Ying.Fourier Transition Infrared Spectroscopic and X- ray Photoelectron Spectroscopic Studies on Metal Oxide- coated LiMn2O4[J].Chinese Journal of Light Scattering,2005,17(4):396-401. |
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| Authors: | WU Chu-an WU Feng BAI Ying |
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| Institution: | 1. School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081; 2. National Development Center for High Technology Green Materials, Beijing 100081 |
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| Abstract: | Metal hydroxides layers were coated on LiMn_2O_4 via a solution chemical method,and metal oxide-coated LiMn_2O_4 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 introduce excessive positive electrical charge,result in the decrease of Mn(2p) binding energy.Additionally,Al_2O_3 and MgO in the coating layer will diffuse into LiMn_2O_4 body phase,while SnO_2 particles are all coated on LiMn_2O_4 surface. |
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| Keywords: | Lithium ion battery LiMn_2O_4 Metal oxide FITR XPS |
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