Analysis of the FePO4 to LiFePO4 phase transition

被引：57

作者：

Allen, J. L. ^{[1
]}

Jow, T. R. ^{[1
]}

Wolfenstine, J. ^{[1
]}

机构：

[1] USA, Res Lab, Adelphi, MD 20783 USA

来源：

JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 2008年 / 12卷 / 7-8期

关键词：

lithium iron phosphate; kinetics; phase transition; Avrami equation;

D O I：

10.1007/s10008-007-0459-1

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electrochemical phase transformation of carbon coated nanophase (60-70 nm) FePO4 to LiFePO4 was investigated by use of the Avrami-Johnson-Mehl-Eroofev equation. The analysis at three temperatures showed an Avrami exponent equal to one. Based upon reinterpretation and in agreement with recent microstructural evidence, a two-dimensional growth mechanism for the phase transformation is proposed in which the new phase grows in a direction perpendicular to the direction of lithium ion transport. Furthermore, the relatively low value of the activation energy for the phase transformation of 13 kJ/mol suggests that the phase transition is controlled by lithium ion diffusion along the phase boundary.

引用

页码：1031 / 1033

页数：3

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