Electrochemical kinetics of nanosized Ag and Ag2O thin films prepared by radio frequency magnetron sputtering
Electrochemical kinetics of nanosized Ag and Ag2O thin films prepared by radio frequency magnetron sputtering
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DOI：
10.1007/s10008-010-1228-0
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发表时间：
2011-09
影响因子：
2.5
通讯作者：
Jian Xie;N. Imanishi;A. Hirano;Y. Takeda;O. Yamamoto;Xinbing Zhao;G. Cao
中科院分区：
文献类型：
--
作者：
Jian Xie;N. Imanishi;A. Hirano;Y. Takeda;O. Yamamoto;Xinbing Zhao;G. Cao
采用射频磁控溅射技术在Cu衬底上制备了Ag和Ag2O薄膜，并用x射线衍射、扫描电镜和原子力显微镜对其进行了表征。用恒流循环法和循环伏安法研究了薄膜的电化学性能。用恒流间歇滴定法和电化学阻抗谱法测定了薄膜中锂离子化学扩散系数的电位依赖性。结果表明，银膜的li离子化学扩散系数在10−16 ~ 3 × 10−14cm2s−1之间。在第一次循环后由Ag2O形成的Ag/Li2O复合材料表现出比Ag膜更高的数值，特别是在低锂嵌入含量时。两相区的相变导致化学扩散系数显著降低。
Ag and Ag2O thin films have been prepared by radio frequency magnetron sputtering on Cu substrates and have been characterized by X-ray diffraction, scanning electron microscope and atomic force microscope. The electrochemical performance of the thin films has been studied by galvanostatic cycling and cyclic voltammetry. The potential dependence of Li-ion chemical diffusion coefficients,, of the films has been determined by galvanostatic intermittent titration technique and electrochemical impedance spectroscopy. It is found that Li-ion chemical diffusion coefficients of the Ag film range from 10−16to 3 × 10−14cm2s−1. The Ag/Li2O composite that is formed from Ag2O after the first cycle exhibits highervalues than the Ag film, especially at a low Li-intercalation content. The phase transitions in the two-phase region cause a significant decrease of chemical diffusion coefficients.