Synthesis and performances of 2LiFePO4•Li3V2(PO4)3/C cathode materials via spray drying method with double carbon sources

The 2LiFePO(4)center dot Li3V2(PO4)(3)/C samples are synthesized through spray drying method. Glucose and oxalic acid are used as collaborative carbon sources to improve the electrochemical performance of 2LiFePO(4)center dot Li3V2(PO4)(3)/C composites. XRD results reveal the LiFePO4 center dot Li3V2(PO4)(3)/C samples are composed of orthorhombic LiFePO4 and monoclinic Li3V2(PO4)(3) phases. SEM results reveal that the nano-spherical Fe-4(VO4)(4)center dot 5H(2)O are about 80 nm and the 2LiFePO(4)center dot Li3V2(PO4)(3)/C composites possess a micro-nano spherical morphology with carbon coating layer. The samples show the best electrochemical performance when the mass ration of glucose and oxalic is 6:4, it can deliver a capacity of 147.6 mAh 145.0 mAh g(-1), 134.1 mAh g(-1) and 123.0 mAh g(-1) at the rates of 0.1C, 1C, 5C and 10C, respectively. (C) 2014 Elsevier B.V. All rights reserved.