A novel method to fabricate nonstoichiometric LiFePO4/C core-shell composites

被引：12

作者：

Fan, Qi ^{[1
]}

Tang, YueFeng ^{[1
]}

Chen, YanFeng ^{[1
]}

机构：

[1] Nanjing Univ, Dept Mat Sci & Engn, Coll Engn & Appl Sci, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2012年 / 205卷

基金：

中国国家自然科学基金;

关键词：

Lithium ion battery; Core-shell; Nonstoichiometric; Electrochemical properties; High tap density; LITHIUM-ION BATTERIES; CARBON-COATED LIFEPO4; CATHODE MATERIALS; NANOCOMPOSITE;

D O I：

10.1016/j.jpowsour.2011.12.035

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 nonstoichiometric LiFePO4/C core-shell composites (as microscale LiFePO4 cores coated with 3-5 nm thin carbon shells) are synthesized by a novel solid-state reaction method. All samples show outstanding coulombic efficiency (about 100%) and good battery cyclability, along with high tap density (>1.70 g cm(-3)). On this basis, the electrochemical properties of two different core-shell composites as Li1.02Fe0.99PO4/C and Li0.98Fe1.01PO4/C are compared. The results show that the rate performance of Li1.02Fe0.99PO4/C is obviously better than the rate performance of Li0.98Fe1.01PO4/C. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：463 / 466

页数：4

共 21 条

[1] Nonstoichiometric LiFePO4: Defects and Related Properties [J].

Axmann, P. ;

Stinner, C. ;

Wohlfahrt-Mehrens, M. ;

Mauger, A. ;

Gendron, F. ;

Julien, C. M. .

CHEMISTRY OF MATERIALS, 2009, 21 (08) :1636-1644

[2] Synthesis and electrochemical analysis of vapor-deposited carbon-coated LiFePO4 [J].

Belharouak, I ;

Johnson, C ;

Amine, K .

ELECTROCHEMISTRY COMMUNICATIONS, 2005, 7 (10) :983-988

[3] Synthesis and electrochemical characterization of carbon-coated nanocrystalline LiFePO4 prepared by polyacrylates-pyrolysis route [J].

Cao, Y. L. ;

Yu, L. H. ;

Li, T. ;

Ai, X. P. ;

Yang, H. X. .

JOURNAL OF POWER SOURCES, 2007, 172 (02) :913-918

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

Chung, SY ;

Bloking, JT ;

Chiang, YM .

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

[5] Moisture driven aging mechanism of LiFePO4 subjected to air exposure [J].

Cuisinier, Marine ;

Martin, Jean-Frederic ;

Dupre, Nicolas ;

Yamada, Atsuo ;

Kanno, Ryoji ;

Guyomard, Dominique .

ELECTROCHEMISTRY COMMUNICATIONS, 2010, 12 (02) :238-241

[6] 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

[7] Lithium deintercalation in LiFePO4 nanoparticles via a domino-cascade model [J].

Delmas, C. ;

Maccario, M. ;

Croguennec, L. ;

Le Cras, F. ;

Weill, F. .

NATURE MATERIALS, 2008, 7 (08) :665-671

[8] LiFePO4 cathode power with high energy density synthesized by water quenching treatment [J].

Gao, Xu-guang ;

Hu, Guo-rong ;

Peng, Zhong-dong ;

Du, Ke .

ELECTROCHIMICA ACTA, 2009, 54 (21) :4777-4782

[9] Future power sources for mobile communications [J].

Green, K ;

Wilson, JC .

ELECTRONICS & COMMUNICATION ENGINEERING JOURNAL, 2001, 13 (01) :43-47

[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

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