...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Time-Difference Impedance Spectroscopy of Growing Films Containing a Single Mobile Charge Carrier, with Application to Surface Films on Li Electrodes
【24h】

Time-Difference Impedance Spectroscopy of Growing Films Containing a Single Mobile Charge Carrier, with Application to Surface Films on Li Electrodes

机译：包含单个移动电荷载流子的生长膜的时差阻抗谱及其在锂电极表面膜上的应用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this paper we present a new approach to the analysis of electrochemical impedance spectroscopy (EIS) data for electrodes covered by passivating surface films that grow in time. The impedance of such electrodes increases in time due to the gradual growth of their thickness as well as to the change of their local characteristics. The growing part of the surface films may either be homogeneous in its structure and properties or inhomogeneous, with gradually changing properties as a function of the distance of the newly formed surface species from the metal-film interface. We show herein that the time-difference impedance spectra (DIS), i.e., the difference between two c9mplex impedance curves, Z(#omega#,t_1) - Z(#omega#,t_2),measured after different periods of storage, 11 and 12, as a function of frequency may provide a very useful tool for characteriZing the nature of the growing passivating films. These time-difference impedance curves (e.g., plotted in coordinates Zi_(mag vs) Z_(real)) can be simulated both for homogeneous growing surface films on electrodes and for situations in which local properties such as the surface film's resistivity are nonuniform across the growing film. The prospects of this approach have been demonstrated in the analysis of the surface films at lithium electrodes freshly prepared and stored in alkyl carbonate mixture (ethylene-dimethyl carbonates) with a Li salt, and measured periodically by EIS. The analysis of DIS of this system has shown that during a period of several hours after the electrode' s preparation in solution, the process of the surface film deposition is very complicated. Properties of the new portions of the film are varying in time so that the deposited film possesses a highly nonuniform structure. Moreover, the local characteristics of earlier formed portions are modified gradually inside the film. However, as the storage time is longer, the growth oftlie surface films on the lithium electrodes becomes more homogeneous, probably due to the increased selectivity of the Li-solution reactions when the surface films are thicker.
机译：在本文中，我们提出了一种新的方法，用于分析被钝化的随时间增长的表面膜覆盖的电极的电化学阻抗谱（EIS）数据。这种电极的阻抗由于其厚度的逐渐增长以及其局部特性的变化而随时间增加。表面膜的生长部分可以在结构和性质上是均匀的，也可以是不均匀的，其性质根据新形成的表面物种与金属膜界面的距离而逐渐变化。我们在这里显示时差阻抗谱（DIS），即两个c9mplex阻抗曲线之间的差Z（＃omega＃，t_1）-Z（＃omega＃，t_2），在不同的存储时间段11后测量图12和图12中，作为频率的函数可以提供非常有用的工具来表征生长的钝化膜的性质。这些时差阻抗曲线（例如，在坐标Zi_（mag vs）Z_（real）中绘制）可以模拟电极上均匀生长的表面膜，也可以模拟局部特性（例如表面膜的电阻率）在电极上不均匀的情况。电影。这种方法的前景已在新制备的锂电极表面膜的分析中得到了证明，并存储在带有Li盐的碳酸烷基酯混合物（乙烯-碳酸二甲酯）中，并通过EIS定期测量。该系统的DIS分析表明，在溶液中制备电极后的数小时内，表面膜沉积的过程非常复杂。膜的新部分的性质随时间变化，使得沉积的膜具有高度不均匀的结构。而且，较早形成的部分的局部特性在膜内部逐渐改变。然而，随着储存时间的延长，锂电极上表面膜的生长变得更加均匀，这可能是由于当表面膜较厚时Li溶液反应的选择性增加了。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号