Journal
ADVANCED ENERGY MATERIALS
Volume 2, Issue 5, Pages 553-559Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201100534
Keywords
LiFe1-yMnyPO4; nanofibers; electrospinning; lithium-ion batteries; cathodes
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Funding
- University of Cologne
- Fraunhofer ISC
- Federal Ministry of Education and Research (BMBF) [KoLiWIn 55102006]
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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.
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