4.6 Article

Resolving a Discrepancy in Diffusion Potentials, with a Case Study for Li-Ion Batteries

期刊

JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 163, 期 8, 页码 E223-E229

出版社

ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0451608jes

关键词

-

资金

  1. U.S. Department of Energy Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office and Advanced Battery Material Research Program [DE-EE-00006821]
  2. Samsung Electronics Co. Ltd.
  3. Samsung Advanced Institute of Technology

向作者/读者索取更多资源

Overpotentials induced by liquid-phase composition variation can be important when electrochemical devices are operated at high current. The dominant models that describe such 'diffusion potentials' are Nernst-Planck (dilute-solution) theory and Onsager-Stefan-Maxwell (concentrated-solution) theory. Nernst-Planck flux laws emerge from Onsager-Stefan-Maxwell laws in the limit of high electrolyte dilution, and the material properties involved come into agreement. The two models yield different expressions for diffusion potentials in the dilute limit, however, because of a disparity in how electric potential is defined. As applied to lithium-ion batteries, concentrated-solution theory employs a voltage measured by a reference electrode reversible to lithium cations; this provides an unambiguous connection to a measurement process, albeit hypothetical on a local scale. After the Nernst-Planck voltage is related to such a properly referenced voltage, the discrepancy in diffusion potentials vanishes. The impact of using Nernst-Planck voltages instead of measurable voltages is illustrated by simulations of a lithium-ion battery. Terminal-to-terminal voltage is relatively unaffected, but the thermal response and internal states change significantly. (C) The Author(s) 2016. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. 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。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据