Sn-Co alloy thin films with high IR reflectivity were prepared by electroplating on a copper substrate and served as anodes of lithium ion battery The interfacial properties of the Sn-Co alloy anode in an electrolyte of 1 M LiPF6/EC + DMC (1 1 vol %) during discharge/charge (or lithiation/delithiation) processes were investigated by using in situ microscope Fourier transform Infrared reflection spectroscopy (in situ MFTIRS) The results demonstrated that the solvation/desolvation reactions of lithium ions with solvent molecules in discharge/charge processes vary with the concentration of both solvated and free solvent molecules leading to the shift of C=O C-O and C-H IR bands The effect of solvation/desolvation which provides a possibility to probe the lithiation/delithiation processes by in situ MFTIRS is observed and analyzed clearly The solid electrolyte interphase (SEI) layer on a cycled Sn-Co alloy anode has also been investigated by ex situ MFTIRS which determined that the main chemical composition of the SEI layer is ROCO2Li The current studies are of significance in understanding the interfacial reactions involving in lithium ion battery at molecular level (C) 2010 Elsevier B V All rights reserved
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机译:通过在铜基板上电镀制备具有高IR反射率的Sn-Co合金薄膜,并用作锂离子电池的负极.Sn-Co合金负极在1 M LiPF6 / EC + DMC电解质中的界面性质(1 1使用原位显微镜傅里叶变换红外反射光谱法(原位MFTIRS)研究了放电/充电(或锂化/脱锂)过程中的体积百分比)结果表明,锂离子与放电/充电中的溶剂分子的溶剂化/去溶剂化反应过程随溶剂化和游离溶剂分子浓度的变化而变化,导致C = O CO和CH IR谱带移动。观察和分析了溶剂化/去溶剂化的效果,这为通过原位MFTIRS探测锂化/去锂化过程提供了可能性显然,还通过非原位MFTIRS研究了循环Sn-Co合金阳极上的固体电解质中间相(SEI)层,该方法确定了SEI层的分子组成为ROCO2Li。当前的研究对于理解锂离子电池在分子水平上的界面反应具有重要意义(C)2010 Elsevier B V保留所有权利
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