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Synthesis and electrochemical performance of LiFePO4/C composite based on xylitol-polyvinyl alcohol complex carbon sources

Synthesis and electrochemical performance of LiFePO4/C composite based on xylitol-polyvinyl... Lithium iron phosphate composite (LiFePO4/C) with uniform carbon coating was synthesized by wet ball-milling, microwave drying, and carbothermal reduction using xylitol-polyvinyl alcohol (PVA) as complex carbon sources. The fused xylitol with the certain viscosity is readily coated on the surface of ferric phosphate (FePO4) during ball-milling. The PVA hydrogel can maintain the precursors stable during the drying process, and the hydrogel also can be transformed into carbon coating around the LiFePO4 during calcination as the additional carbon source. The unique properties of the complex carbon sources result in uniform carbon coating all over the fine spherical particles with an average primary particle size of 350 nm. The particles are connected by a network of filamentous conductive carbon, which provides a channel for Li+ conduction. As a result of this unique structure, the synthesized LiFePO4/C exhibits high electronic and ionic conductivities, which contributes to excellent electrochemical performance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ionics Springer Journals

Synthesis and electrochemical performance of LiFePO4/C composite based on xylitol-polyvinyl alcohol complex carbon sources

Ionics , Volume 25 (4) – Dec 11, 2018

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References (59)

Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Chemistry; Electrochemistry; Renewable and Green Energy; Optical and Electronic Materials; Condensed Matter Physics; Energy Storage
ISSN
0947-7047
eISSN
1862-0760
DOI
10.1007/s11581-018-2779-9
Publisher site
See Article on Publisher Site

Abstract

Lithium iron phosphate composite (LiFePO4/C) with uniform carbon coating was synthesized by wet ball-milling, microwave drying, and carbothermal reduction using xylitol-polyvinyl alcohol (PVA) as complex carbon sources. The fused xylitol with the certain viscosity is readily coated on the surface of ferric phosphate (FePO4) during ball-milling. The PVA hydrogel can maintain the precursors stable during the drying process, and the hydrogel also can be transformed into carbon coating around the LiFePO4 during calcination as the additional carbon source. The unique properties of the complex carbon sources result in uniform carbon coating all over the fine spherical particles with an average primary particle size of 350 nm. The particles are connected by a network of filamentous conductive carbon, which provides a channel for Li+ conduction. As a result of this unique structure, the synthesized LiFePO4/C exhibits high electronic and ionic conductivities, which contributes to excellent electrochemical performance.

Journal

IonicsSpringer Journals

Published: Dec 11, 2018

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