Abstract
Li2MnSiO4/C composite nanofibers were synthesized directly from homogeneous precursor solution via electrospinning followed by pre-oxidation and heat treatment using polyvinylpyrrolidone as electrospinning template and carbon source. Effect of two different manganese sources, manganese nitrate hexahydrate and manganese acetate, was studied, and post treatment parameters were optimized in order to obtain the desired material. In present synthesis conditions, orthorhombic Li2MnSiO4 with Pmn21 space group containing some monoclinic (Pn) and MnO impurity phases could be obtained in a short heat treatment time from manganese nitrate as Mn source. The sample prepared via pre-oxidation at 280 ºC followed by heat treatment at 675 ºC with heating rate of 2 ºC min-1 for 1 h exhibited the best physical properties in terms of phase purity, higher crystallinity and carbon content. Electrochemical properties of this sample was further investigated by galvanostatic charge/discharge test. The cell delivered an initial discharge capacity of 91 mAh g-1 at 0.1 C.
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