Electrospun LiFe1-yMnyPO4/C Nanofiber Composites as Self-Supporting Cathodes in Li-Ion Batteries

被引：97

作者：

von Hagen, Robin ^{[1
]}

Lorrmann, Henning ^{[2
]}

Moeller, Kai-Christian ^{[2
]}

Mathur, Sanjay ^{[1
]}

机构：

[1] Univ Cologne, Inst Inorgan Chem, D-50939 Cologne, Germany

[2] Fraunhofer Inst Silicate Res ISC, D-97082 Wurzburg, Germany

来源：

ADVANCED ENERGY MATERIALS | 2012年 / 2卷 / 05期

关键词：

LiFe1-yMnyPO4; nanofibers; electrospinning; lithium-ion batteries; cathodes; CHEMICAL-VAPOR GROWTH; ELECTROCHEMICAL PERFORMANCE; LITHIUM; LIFEPO4; NANOWIRES; LIMNPO4;

D O I：

10.1002/aenm.201100534

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：

LiFe1-yMnyPO4/C nanofiber composites are applied as cathode materials in Li-ion batteries and their electrochemical properties are explored. Nanofiber meshes are synthesized via electrospinning of commercially available precursors (LiOH.H2O, FeSO4.7H2O, MnSO4.H2O, H3PO4, and polyvinylpyrrolidone). Nanofibers calcined at 850 degrees C under Ar/H2 (95/5 vol%) atmosphere are directly used as self-supporting electrodes in Swagelok half cells without the need for any conductive additive or polymer binder. The morphology, phase, and chemical composition of as-prepared and heat-treated samples are analyzed by means of X-ray powder diffraction, thermogravimetric analysis, and electron and scanning microscopy techniques. BrunauerEmmettTeller gas adsorptiondesorption measurements show a high specific surface area (111m2 g-1) for LiFe0.5Mn0.5PO4. The influence of different Fe/Mn ratios on the morphology, electrical, and electrochemical performances are analyzed.

引用

页码：553 / 559

页数：7

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