Statistical kinetics of phase-transforming nanoparticles in LiFePO4 porous electrodes

被引：48

作者：

Bai, Peng ^{[1
]}

Tian, Guangyu ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Automot Engn, State Key Lab Automot Safety & Energy, Beijing 100084, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2013年 / 89卷

关键词：

Li-ion battery; Porous electrode; Phase transformation; Phase-field method; Statistical kinetics; MULTIPLE NUCLEATION; ION-INSERTION; ACTIVE-SITES; THERMODYNAMICS; SEPARATION; DIFFUSION; DISCHARGE; SYSTEM; ENERGY; MODEL;

D O I：

10.1016/j.electacta.2012.11.070

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Using a simple mathematical model, we demonstrate that statistical kinetics of phase-transforming nanoparticles in porous electrodes results in macroscopic non-monotonic transient currents, which could be misinterpreted as the nucleation and growth mechanism by the Kolmogorov-Johnson-Mehl-Avrami (KJMA) theory. Our model decouples the roles of nucleation and surface reaction in the electrochemically driven phase-transformation process by a special activation rate and the mean particle-filling speed of active nanoparticles, which can be extracted from the responses of porous electrodes to identify the dynamics in single composing nanoparticles. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：644 / 651

页数：8

共 47 条

[1] Kinetic study of the electrochemical FePO4 to LiFePO4 phase transition [J].