A discharge model for phase transformation electrodes: Formulation, experimental validation, and analysis

被引：87

作者：

Wang, Chunsheng ^{[1
]}

Kasavajjula, Uday S.

Arce, Pedro E.

机构：

[1] Tennessee Technol Univ, Dept Chem Engn, Cookeville, TN 38501 USA

[2] Tennessee Technol Univ, Ctr Mfg Res, Cookeville, TN 38501 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 44期

关键词：

D O I：

10.1021/jp074490u

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The discharge kinetics of phase transformation electrodes for Li-ion batteries were investigated by developing a mathematical model based on mixed-mode phase transformation, by assuming that the phase transformation is controlled by both Li chemical diffusion and interface mobility. The discharge model was validated by matching the model discharge curves with the experimental discharge curves of two LiFePO4 samples at different current densities. With the validated model as a tool, effects of phase transformation, chemical diffusion, and solid solution range on rate capability were determined and analyzed. The high rate performance of LiFePO4 was well explained by using this model. The model developed here is applicable for any ion insertion electrode with a phase transformation, such as Li4Ti5O12 in Li-ion battery and metal-hydride electrodes in Ni/MH batteries.

引用

页码：16656 / 16663

页数：8

共 36 条

[1]

BARD AJ, 2004, ELECTROCHEMICAL METH, P99

[2] Metastable solid-solution phases in the LiFePO4/FePO4 system [J].

Chen, Guoying ;

Song, Xiangyun ;

Richardson, Thomas J. .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2007, 154 (07) :A627-A632

[3]

CHIANG YM, 2006, ECS M CANC MEX NOV

[4]

CHRISTIAN J, 1981, THEORY PHASE TRANSFO

[5] Electronically conductive phospho-olivines as lithium storage electrodes [J].

Chung, SY ;

Bloking, JT ;

Chiang, YM .

NATURE MATERIALS, 2002, 1 (02) :123-128

[6] Effect of surface carbon structure on the electrochemical performance of LiFePO4 [J].

Doeff, MM ;

Hu, YQ ;

McLarnon, F ;

Kostecki, R .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2003, 6 (10) :A207-A209

[7] Small polaron hopping in LixFePO4 solid solutions:: Coupled lithium-ion and electron mobility [J].

Ellis, Brian ;

Perry, Laura K. ;

Ryan, Dominic H. ;

Nazar, L. F. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (35) :11416-11422

[8]

GEOFFROY D, 2004, INT SEM EXH PRIM SEC

[9] Characterization of sol-gel-synthesized LiFePO4 by multiple scattering XAFS [J].

Giorgetti, M ;

Berrettoni, M ;

Scaccia, S ;

Passerini, S .

INORGANIC CHEMISTRY, 2006, 45 (06) :2750-2757

[10] Nano-network electronic conduction in iron and nickel olivine phosphates [J].

Herle, PS ;

Ellis, B ;

Coombs, N ;

Nazar, LF .

NATURE MATERIALS, 2004, 3 (03) :147-152

← 1 2 3 4 →