Simulated impedance of diffusion in porous media
Simulated impedance of diffusion in porous media
复制标题
DOI：
10.1016/j.electacta.2017.07.152
复制
发表时间：
2017-10-10
影响因子：
6.6
通讯作者：
Brandon, Nigel P.
中科院分区：
文献类型：
--
作者：
Cooper, Samuel J.;Bertei, Antonio;Brandon, Nigel P.
本文介绍了使用频域，有限差分格式来模拟多孔微结构中扩散的阻抗谱。开放和封闭的系统进行了调查的范围内的理想的几何形状，以及一些随机生成的合成卷和断层摄影衍生的微观结构数据。在许多情况下，光谱偏离传统的沃伯格型元素通常用于代表扩散在等效电路分析显着。一个关键的发现是，某些微结构在复平面中显示多个峰，这可能被误解为真实的阻抗数据中的单独的电化学过程。随着纳米级制造技术变得更加普遍，这与电池电极设计相关。该模拟工具作为开源MatLab应用程序提供，并作为TauFactor平台的一部分在线免费提供。(C)2017作者由爱思唯尔有限公司发布
This paper describes the use of a frequency domain, finite-difference scheme to simulate the impedance spectra of diffusion in porous microstructures. Both open and closed systems are investigated for a range of ideal geometries, as well as some randomly generated synthetic volumes and tomographically derived microstructural data. In many cases, the spectra deviate significantly from the conventional Warburg-type elements typically used to represent diffusion in equivalent circuit analysis. A key finding is that certain microstructures show multiple peaks in the complex plane, which may be misinterpreted as separate electrochemical processes in real impedance data. This is relevant to battery electrode design as the techniques for nano-scale fabrication become more widespread. This simulation tool is provided as an open-source MatLab application and is freely available online as part of the TauFactor platform. (C) 2017 The Authors. Published by Elsevier Ltd.