扩散
化学
固态
电化学
热力学
分析化学(期刊)
材料科学
电极
环境化学
物理化学
物理
作者
Jeffrey S. Horner,Grace Whang,David S. Ashby,Igor V. Kolesnichenko,Timothy N. Lambert,Bruce Dunn,A. Alec Talin,Scott Alan Roberts
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-10-12
卷期号:4 (10): 11460-11469
被引量:46
标识
DOI:10.1021/acsaem.1c02218
摘要
The galvanostatic intermittent titration technique (GITT) is widely used to evaluate solid-state diffusion coefficients in electrochemical systems. However, the existing analysis methods for GITT data require numerous assumptions, and the derived diffusion coefficients typically are not independently validated. To investigate the validity of the assumptions and derived diffusion coefficients, we employ a direct-pulse fitting method for interpreting the GITT data that involves numerically fitting an electrochemical pulse and subsequent relaxation to a one-dimensional, single-particle, electrochemical model coupled with non-ideal transport to directly evaluate diffusion coefficients. Our non-ideal diffusion coefficients, which are extracted from GITT measurements of the intercalation regime of FeS2 and independently verified through discharge predictions, prove to be 2 orders of magnitude more accurate than ideal diffusion coefficients extracted using conventional methods. We further extend our model to a polydisperse set of particles to show the validity of a single-particle approach when the modeled radius is proportional to the total volume-to-surface-area ratio of the system.
科研通智能强力驱动
Strongly Powered by AbleSci AI