Li 3 V 2 (PO 4 ) 3 /C samples were synthesized by two different synthesis methods. Their influence on electrochemical performances of Li 3 V 2 (PO 4 ) 3 /C as cathode materials for lithium-ion batteries was investigated. The structure and morphology of Li 3 V 2 (PO 4 ) 3 /C samples were characterized by X-ray diffraction and scanning electron microscopy. Electrochemical performance was characterized by charge/discharge, cyclic voltammetry, and alternating current (AC) impedance measurements. Li 3 V 2 (PO 4 ) 3 /C with smaller grain size showed better performances in terms of the discharge capacity and cycle stability. The improved electrochemical properties of the Li 3 V 2 (PO 4 ) 3 /C were attributed to the decreasing grain size and enhanced electrical conductivity produced via low temperature route. AC impedance measurements also showed that the Li 3 V 2 (PO 4 ) 3 /C synthesized by low temperature route significantly decreased the chargetransfer resistance and shortened the migration distance of lithium ion.
LiVPO4F/C cathode material was synthesized by a novel one-step solid-state reaction method using humic acid as both reduction agent and carbon sources. The SEM image showed that the particles merged with each other to form a porous structure. Electrochemical test showed that the initial discharge capacity of LiVPO4F/C powder was 139 mA h g−1 and the capacity was 132 mA h g−1 after 30 cycles.
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