Improved lithium exchange at LiFePO4 cathode particles by coating with composite polypyrrole-polyethylene glycol layers

被引：15

作者：

Fedorkova, Andrea ^{[1
]}

Wiemhoefer, Hans-Dieter ^{[2
]}

Orinakova, Renata ^{[3
]}

Orinak, Andrej ^{[3
]}

Stan, Marian Cristian ^{[4
]}

Winter, Martin ^{[4
]}

Kaniansky, Dusan ^{[1
]}

Alejos, Ana Nacher ^{[5
]}

机构：

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

[2] Univ Munster, Dept Inorgan & Analyt Chem, D-48149 Munster, Germany

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

[4] Univ Munster, Dept Phys Chem, D-48149 Munster, Germany

[5] CSIC, Inst Ciencia Mat Barcelona, E-08193 Barcelona, Spain

来源：

JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 2009年 / 13卷 / 12期

关键词：

Lithium iron phosphate; Lithium cathodes; Polypyrrole; Polyethylene glycol; Lithium-ion batteries; POSITIVE-ELECTRODE MATERIALS; ELECTROCHEMICAL PERFORMANCE; BATTERIES;

D O I：

10.1007/s10008-008-0756-3

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The polypyrrole-LiFePO4 composites were synthesized by simple chemical oxidative polymerization of pyrrole (Py) monomer directly on the surface of LiFePO4 particles. Properties of resulting polypyrrole-LiFePO4 (PPy-LiFePO4) samples (especially conductivity) are strongly affected by the preparation technique, polymer additives, and conditions during synthesis. For increasing of PPy-LiFePO4 conductivity, we used polyethylene glycol (PEG) as additive during polymerization. The electrochemical behavior of the samples was examined by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that PPy/PEG composite polymer decreased the particle to particle contact resistance. Impedance measurements showed that the coating of PPy/PEG significantly decreases the charge transfer resistance of LiFePO4 electrodes.

引用

页码：1867 / 1872

页数：6

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