Structural and electrochemical studies of PPy/PEG-LiFePO4 cathode material for Li-ion batteries

被引：78

作者：

Fedorkova, Andrea ^{[1
]}

Nacher-Alejos, Ana ^{[2
]}

Gomez-Romero, Pedro ^{[2
]}

Orinakova, Renata ^{[3
]}

Kaniansky, Dusan ^{[1
]}

机构：

[1] Comenius Univ, Fac Sci, Dept Analyt Chem, SK-84215 Bratislava 4, Slovakia

[2] CSIC, ICN, CIN2, Ctr Invest Nanociencia & Nanotecnol, E-08193 Barcelona, Spain

[3] Safarik Univ, Fac Sci, Inst Chem, SK-04154 Kosice, Slovakia

来源：

ELECTROCHIMICA ACTA | 2010年 / 55卷 / 03期

关键词：

Li-ion batteries; LiFePO4; Polypyrrole; Cathode material; PPy/PEG composite; LIFEPO4; PERFORMANCE; COMPOSITE; POLYPYRROLE; CARBON;

D O I：

10.1016/j.electacta.2009.09.060

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A simple chemical oxidative polymerization of pyrrole (Py) directly onto the surface of LiFePO4 particles was applied to the synthesis of polypyrrole-LiFePO4 (PPy-LiFePO4) powder. The LiFePO4 sample without carbon coating was synthesized by a solvothermal method. The polyethylene glycol (PEG) was used as additive during Py polymerization for increasing the PPy-LiFePO4 conductivity. Properties of resulting LiFePO4, PPy-LiFePO4 and PPy/PEG-LiFePO4 samples were characterized by XRD, SEM , TGA and galvanostatic charge-discharge measurements. These methods confirmed the presence of polypyrrole on LiFePO4 particles and its homogeneous distribution in the resulting powder material. The PPy/PEG-LiFePO4 composites show higher discharge capacity than pure LiFePO4, as PPy/PEG network improves the electron conductivity. It presents specific discharge capacity of 153 mAh/g at C/5 rate. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：943 / 947

页数：5

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