Preparation and electrochemical performance of 7LiFePO4•3Li3V2(PO4)3/C

LiFePO4 center dot 3Li(3)V(2)(PO4)(3)/C is prepared by a solid state method with sucrose as carbon source. A sucrose liquefying process at 180 degrees C is applied to make liquid sucrose spread on the surface of solid particles. HRTEM shows carbon film with high crystallinity are formed among 7LiFePO(4)center dot 3Li(3)V(2)(PO4)(3) material. This material shows excellent rate performance, at the current density of 17 mA g(-1), its specific capacity is 152 mAh g(-1), which can be 92 mAh g(-1) when the current density is increased to 1700 mA g(-1). If no heattreatment step at 180 degrees C, the 7LiFePO(4)center dot 3Li(3)V(2)(PO4)(3) material only has the discharge capacity of 69 mAh g(-1) at 1700 mA g(-1). (C) 2015 Elsevier B.V. All rights reserved.