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

共 19 条

[11] Phospho-olivines as positive-electrode materials for rechargeable lithium batteries
Padhi, AK
Nanjundaswamy, KS
Goodenough, JB
[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1997, 144 (04) : 1188 - 1194
[12] PORTER DA, 1981, PHASE TRANSFORMATION, P287
[13] THE 3 ACTIVATION-ENERGIES WITH ISOTHERMAL TRANSFORMATIONS - APPLICATIONS TO METALLIC GLASSES
RANGANATHAN, S
VONHEIMENDAHL, M
[J]. JOURNAL OF MATERIALS SCIENCE, 1981, 16 (09) : 2401 - 2404
[14] Determination of the isothermal nucleation and growth parameters for the crystallization of thin Ge2Sb2Te5 films
Ruitenberg, G
Petford-Long, AK
Doole, RC
[J]. JOURNAL OF APPLIED PHYSICS, 2002, 92 (06) : 3116 - 3123
[15] Softening of nanocrystalline metals at very small grain sizes
Schiotz, J
Di Tolla, FD
Jacobsen, KW
[J]. NATURE, 1998, 391 (6667) : 561 - 563
[16] Discharge model for the lithium iron-phosphate electrode
Srinivasan, V
Newman, J
[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2004, 151 (10) : A1517 - A1529
[17] Reaction behavior of LiFePO4 as a cathode material for rechargeable lithium batteries
Takahashi, M
Tobishima, S
Takei, K
Sakurai, Y
[J]. SOLID STATE IONICS, 2002, 148 (3-4) : 283 - 289
[18] Isothermal kinetic of phase transformation and mixed electrical conductivity in Bi3NbO7
Wang, X. P.
Corbel, G.
Kodjikian, S.
Fang, Q. F.
Lacorre, P.
[J]. JOURNAL OF SOLID STATE CHEMISTRY, 2006, 179 (11) : 3338 - 3346
[19] West A. R., 1984, SOLID STATE CHEM ITS, P439

← 1 2 →