期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 654, 期 -, 页码 363-370出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.09.095
关键词
Ag based anodes; Lithium ion batteries; Magnetron sputtering
In the present work we proposed a new strategy to produce Si electrodes with high capacity retention. Si film with 20% at. Ag content is deposited by magnetron sputtering. The galvanostatic test result shows that the electrode delivers 1825 mAh g(-1) initially with 95% Coulombic efficiency and retains 96% of its initial discharge capacity after 60 cycles when cycled between 0.2-1.2 V. The same SiAg electrode performs 2500 mAh g(-1) as the first discharge capacity and quickly fails after 20 cycles when cycled between 0.005-1.2 V. Cyclic voltammetry and electrochemical impedance spectroscopy show that by proper selection of lower cut-off voltage (0.2 V), Ag particles remain inactive versus Li in cycling, which induces the distribution of finely dispersed active (Si) element with an inactive component (Ag) in the electrode. The results of the galvanostatic test at different lower cut-off potentials exhibit outstanding properties. The SiAg electrodes are highly dependent on the potential range since high reversibility and good capacity retention are mostly related to the presence of Ag, which decreases the polarization of anode when its reaction with lithium is restricted. (C) 2015 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据