Study on dynamics of structural transformation during charge/discharge of LiFePO4 cathode

被引：58

作者：

Chang, Hao-Hsun ^{[1
]}

Chang, Chun-Chih ^{[1
]}

Wu, Hung-Chun ^{[2
]}

Yang, Mo-Hua ^{[2
]}

Sheu, Hwo-Shuenn ^{[3
]}

Wu, Nae-Lih ^{[1
]}

机构：

[1] Natl Taiwan Univ, Dept Chem Engn, Taipei 106, Taiwan

[2] Ind Technol Res Inst, Mat Res Labs, Hsinchu 310, Taiwan

[3] Natl Synchrotron Radiat Res Ctr, Hsinchu 30077, Taiwan

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2008年 / 10卷 / 02期

关键词：

LiFePO4; structural transformation; synchrotron X-ray diffraction; Li-ion secondary battery; cathode;

D O I：

10.1016/j.elecom.2007.12.024

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Structural transformation taking place during charge/discharge of the LiFePO4 electrode in an organic Li-ion electrolyte has been studied by in situ synchrotron X-ray diffraction (XRD) concurrently with electrochemical analysis. The data reveal complex structural transformation patterns which result from significantly delayed structural transformation, even at low to moderate current rates (C/10 similar to 1 C). The extent of the deviation is affected by charge/discharge conditions as well as history, and strong deviation appears detrimental to electrode cycle life. Furthermore, the two-phase characteristic of the Li+ insertion/extraction reactions is found to persist even within one metastable crystal structure. The result suggests the presence of domain structures that are probably caused by the strong electron/ion site coulombic interaction as previously suggested. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：335 / 339

页数：5

共 17 条

[1] The source of first-cycle capacity loss in LiFePO4 [J].

Andersson, AS ;

Thomas, JO .

JOURNAL OF POWER SOURCES, 2001, 97-8 :498-502

[2] Kinetic study on low-temperature synthesis of LiFePO4 via solid-state reaction [J].

Chang, Hao-Hsun ;

Chang, Chun-Chih ;

Wu, Hung-Chun ;

Guo, Zheng-Zhao ;

Yang, Mo-Hua ;

Chiang, Yung-Ping ;

Sheu, Hwo-Shuenn ;

Wu, Nae-Lih .

JOURNAL OF POWER SOURCES, 2006, 158 (01) :550-556

[3] Electron microscopy study of the LiFePO4 to FePO4 phase transition [J].

Chen, GY ;

Song, XY ;

Richardson, TJ .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2006, 9 (06) :A295-A298

[4] Hydrothermal synthesis of lithium iron phosphate [J].

Chen, Jiajun ;

Whittingham, M. Stanley .

ELECTROCHEMISTRY COMMUNICATIONS, 2006, 8 (05) :855-858

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

Chung, SY ;

Bloking, JT ;

Chiang, YM .

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

[6] Crystal chemistry of the olivine-type LixFePO4 system (0 ≤ x ≤ 1) between 25 and 370°C [J].

Delacourt, C ;

Rodríguez-Carvajal, J ;

Schmitt, B ;

Tarascon, JM ;

Masquelier, C .

SOLID STATE SCIENCES, 2005, 7 (12) :1506-1516

[7] The existence of a temperature-driven solid solution in LixFePO4 for 0 ≤ x ≤ 1 [J].

Delacourt, C ;

Poizot, P ;

Tarascon, JM ;

Masquelier, C .

NATURE MATERIALS, 2005, 4 (03) :254-260

[8]

GOZDZ AS, 2005, Patent No. 20050233219

[9] Approaching theoretical capacity of LiFePO4 at room temperature at high rates [J].

Huang, H ;

Yin, SC ;

Nazar, LF .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2001, 4 (10) :A170-A172

[10]

KANG B, INT M LITH BATT BIAR

← 1 2 →