Improving the rate performance of LiFePO4 by Fe-site doping

被引：387

作者：

Wang, DY ^{[1
]}

Li, H ^{[1
]}

Shi, SQ ^{[1
]}

Huang, XJ ^{[1
]}

Chen, LQ ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Lab Solid State Ion, Beijing 100080, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2005年 / 50卷 / 14期

关键词：

Fe-site doping; rate performance; cyclic stability; LiFePO4;

D O I：

10.1016/j.electacta.2004.11.045

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

LiFePO4 doped by bivalent cation in Fe-sites show improved rate performance and cyclic stability. Under 10 C rate at room temperature, the capacities of LiFe0.9M0.1PO4 (M = Ni, Co, Mg) maintain at 81.7, 90.4 and 88.7 mAh/g, respectively, in comparison with 53.7 mAh/g for undoped LiFePO4 and 54.8 mAh/g for carbon-coated LiFePO4 (LiFePO4/C). The capacity retention is 95% after 100 cycles for doped samples while this value is only 70% for LiFePO4 and LiFePO4/C. Such a significant improvement in electrochemical performance should be partially related to the enhanced electronic conductivities (from 2.2 x 10(-9) to < 2.5 x 10(-7) S cm(-1)) and probably the mobility of Li+ ions in the doped samples. (c) 2004 Elsevier Ltd. All rights reserved.

引用

页码：2955 / 2958

页数：4

共 20 条

[1] Fine-particle lithium iron phosphate LiFePO4 synthesized by a new low-cost aqueous precipitation technique [J].

Arnold, G ;

Garche, J ;

Hemmer, R ;

Ströbele, S ;

Vogler, C ;

Wohlfahrt-Mehrens, A .

JOURNAL OF POWER SOURCES, 2003, 119 :247-251

[2] Lithium iron(II) phospho-olivines prepared by a novel carbothermal reduction method [J].

Barker, J ;

Saidi, MY ;

Swoyer, JL .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2003, 6 (03) :A53-A55

[3] Reducing carbon in LiFePO4/C composite electrodes to maximize specific energy, volumetric energy, and tap density [J].

Chen, ZH ;

Dahn, JR .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2002, 149 (09) :A1184-A1189

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

Chung, SY ;

Bloking, JT ;

Chiang, YM .

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

[5] A novel concept for the synthesis of an improved LiFePO4 lithium battery cathode [J].

Croce, F ;

D'Epifanio, A ;

Hassoun, J ;

Deptula, A ;

Olczac, T ;

Scrosati, B .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2002, 5 (03) :A47-A50

[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] LiFePO4 synthesis routes for enhanced electrochemical performance [J].

Franger, S ;

Le Cras, F ;

Bourbon, C ;

Rouault, H .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2002, 5 (10) :A231-A233

[8] 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

[9] Surface chemistry of carbon-treated LiFePO4 particles for Li-ion battery cathodes studied by PES [J].

Herstedt, M ;

Stjerndahl, M ;

Nytén, A ;

Gustafsson, T ;

Rensmo, H ;

Siegbahn, H ;

Ravet, N ;

Armand, M ;

Thomas, JO ;

Edström, K .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2003, 6 (09) :A202-A206

[10] 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

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