储锂硅材料的ESR谱研究  

An ESR Study of Lithium-stored Silicon

作　　者：周晓荣[1] 刘小波[1] 庄林[2] 陆君涛[2] 

机构地区：[1]武汉工业学院化学与环境工程系,湖北武汉430023 [2]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《波谱学杂志》2009年第2期223-229,共7页Chinese Journal of Magnetic Resonance

基　　金：武汉工业学院校立青年基金资助项目(07Q11);湖北省教育厅资助项目(B20081804)

摘　　要：采用了电化学方法制备储锂硅材料,并用电子自旋共振(ESR)方法进行研究.实验结果表明,储锂前的硅ESR行为符合居里自旋的ESR特征,ESR信号主要来源于硅材料中的晶格缺陷、表面悬空键等局域化自旋中心.储锂后硅材料中产生了泡利自旋,居里自旋的强度比储锂前增大2～3倍.此外,对硅和储锂硅ESR谱线的g因子和ΔHpp随温度的变化情况也进行了分析.硅材料电化学储锂时,与锂离子中和的电子主要参与形成Li-Si共价键,对ESR信号贡献很小.In this paper, lithium stored silicon were prepared with the electrochemical reaction method. The electron spin resonance （ESR） signals of silicon and lithium-stored silicon were measured. The ESR intensity of silicon showed a linear change with the reciprocal of the temperature, indicative of the presence of Curie spins, which may come from localized spin centers, such as crystal defects and hanging bonds on the surface. In lithium-stored silicon, however, both Pauli spins and Curie spins were shown to be present. The amplitude of integrated ESR signals owing to Curie spins in lithium stored silicon was 2-3 times higher than that in silicon. The effects of temperature on the g factor and line width （△Hpp） of the ESR signals were also investigated. It could be concluded that when lithium ion reacts with silicon in the electrochemical reaction, eompensating electrons from the external circuit mostly took part in forming the covalent bonds between Li and Si, and contributed little to the ESR intensity.

关 键 词：电子自旋共振(ESR) 电化学 硅 储锂硅 

分 类 号：O646[理学—物理化学] O657.61[理学—化学]