Mixing transition-metal phosphates Li3V2 xFex(PO4)(3) (0 <= x <= 2) were first designed to be a type of intercalated and deintercalated cathodes to obtain high specific capacity for safe Li-ion batteries. Since the residual oxygen in the quartz tube furnace and pellet would oxidize the V3+ to V4+ in the Ar ambience during the sintering process, trace amounts of acetylene black inside and outside the pellet could play a role of deoxidizer to protect V3+ meanwhile ensure Fe3+ not reducing to Fe2+. With the concerted effort of inside and outside acetylene black, monoclinic structure Li3V2 xFex(PO4)(3) (0 < x < 2) solid solutions had been successfully fabricated via a two-step synthesis method. X-ray diffractions with Rietveld refinement revealed that V1-sites were the preferred position when Fe3+ ions doped into Li3V2(PO4)(3), which means, every V1-site was occupied with the same probability by V3+ and Fe3+ when 0

Keywords:Mixing transition-metal phosphates;Li3V2-xFex(PO4)(3);Two-step synthesis method;Deoxidizer;Stabilized lithium metal powder technology