Analysis of lithium deinsertion/insertion in LiyFePO4 with a simple mathematical model

被引：59

作者：

Delacourt, C. ^{[1
]}

Safari, M. ^{[1
]}

机构：

[1] Univ Picardie Jules Verne, CNRS UMR 6007, Lab Reactivite & Chim Solides, Amiens, France

来源：

ELECTROCHIMICA ACTA | 2011年 / 56卷 / 14期

关键词：

LiFePO4; Mathematical model; INTERMITTENT TITRATION TECHNIQUE; DIFFUSION-COEFFICIENT; DISCHARGE MODEL; LI-INSERTION/EXTRACTION; STRAIN ACCOMMODATION; MISCIBILITY GAP; PARTICLE-SIZE; LIFEPO4; ELECTRODE; DEINTERCALATION;

D O I：

10.1016/j.electacta.2011.03.030

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

070208 [无线电物理];

摘要：

The onset of experimental galvanostatic charge/discharge data of LiyFePO4 at low current density and at room temperature is analyzed using a single-particle mathematical model. The model contains only two adjustable parameters, namely one related to solid-state diffusion in the active particle and another one related to the surface resistance of the particle. The analysis reveals that these two parameters depend on the current density in a similar manner, meaning that there exists a correlation between them. An immediate consequence is that the onset of the experimental charge/discharge curves is properly modeled with the particle radius as a unique parameter depending on the current density. Hypotheses are made to shed light on this unusual dependence. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：5222 / 5229

页数：8

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