Determination of lithium diffusion coefficient in LiFePO4 electrode by galvanostatic and potentiostatic intermittent titration techniques

被引：167
作者：
Churikov, A. V. [1 ]
Ivanishchev, A. V. [1 ]
Ivanishcheva, I. A. [1 ]
Sycheva, V. O. [1 ]
Khasanova, N. R. [2 ]
Antipov, E. V. [2 ]
机构：
[1] Saratov NG Chernyshevskii State Univ, Inst Chem, Saratov 410012, Russia
[2] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 199992, Russia
来源：
ELECTROCHIMICA ACTA | 2010年 / 55卷 / 08期
关键词：
Diffusion processes; Insertion host materials; Phase transition; Galvanostatic and potentiostatic intermittent titration technique; Li-ion battery; LOGISTIC DIFFERENTIAL-EQUATION; ELECTROCHEMICAL IMPEDANCE; KINETIC CHARACTERISTICS; GRAPHITE-ELECTRODES; NUMERICAL-ANALYSIS; MANGANESE-DIOXIDE; GENERAL EQUATION; SOLID-SOLUTION; HOST MATERIALS; ION;
D O I：
10.1016/j.electacta.2009.12.079
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
A new model of lithium-ion transport processes in the LiFePO4 electrode is proposed. This model takes into account the phase transition LiFePO4 <-> FePO4 accompanying reversible lithium intercalation into the electrode during potential or current steps. The diffusion coefficient of Li+ ion and its dependence on the LiFePO4/FePO4 phase ratio have been determined by means of processing of experimental potential and current transients in accordance with the model's equations. The results of galvanostatic and potentiostatic intermittent titration techniques are in good agreement. The value of diffusion coefficient varies within 10(-10)-10(-16) cm(2) s(-1) depending on the lithium content in solid solution LixFePO4 and Li1-xFePO4 (X<0.02) or the LiFePO4/FePO4 phase ratio. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2939 / 2950
页数：12
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