Electrochemical modeling of intercalation processes with phase field models

被引：197

作者：

Han, BC ^{[1
]}

Van der Ven, A ^{[1
]}

Morgan, D ^{[1
]}

Ceder, G ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

ELECTROCHIMICA ACTA | 2004年 / 49卷 / 26期

基金：

美国国家科学基金会;

关键词：

phase field models; PITT; GITT; Li-ion batteries; intercalation; diffusion; Fick's equation; Chebyshev-spectral methods; Cahn-Hilliard equation; Allen-Cahn equation; gradient energy coefficient; computer simulations;

D O I：

10.1016/j.electacta.2004.05.024

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In this paper, we apply phase field models to move beyond Fick's law in describing Li diffusion in secondary battery electrodes. Phase field models are potentially more accurate and allow simpler tracking of phase boundaries than Fick's equation. The phase field models are implemented using the highly accurate but fast Chebyshev-spectral method. Using the phase field we investigate to what extent non-Fickian behavior can affect results from experimental techniques for measuring diffusion coefficients, such as Galvanostatic Intermittent Titration Technique (GITT) and Potentiostatic Intermittent Titration Technique (PITT). We show that GITT and PITT can still accurately measure the diffusion coefficient in systems described by phase field models even when significant gradient energy terms are present. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：4691 / 4699

页数：9

共 33 条

[31] THERMODYNAMIC AND MASS-TRANSPORT PROPERTIES OF LIAL [J].