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.
Published Version
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