Abstract
Composites of monoclinic Li 3− x M′ x V 2− y M″ 2 y (PO 4) 3 (M′ = K, M″ = Sc, Mg + Ti) with carbon were synthesized by solid-state reaction using oxalic acid or 6% H 2/Ar gas mixture as reducing agents at sintering temperature of 850 °C. The samples were characterized by X-ray diffraction (XRD), voltammetry and electrochemical galvanostatic cycling. The capacity of Li 3V 2(PO 4) 3 synthesized using hydrogen as the reducing agent was 127 mA h g −1 and decreased to 120 mA h g −1 after 20 charge–discharge cycles. The substitution of lithium and vanadium for other ions did not result in the improvement of the electrochemical characteristics of the samples.
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