Li3V2(PO4)3@C/graphene composite with improved cycling performance as cathode material for lithium-ion batteries

A novel cathode material for lithium-ion batteries, carbon-coated Li3V2(PO4)3 particles which anchored onto graphene sheets (Li3V2(PO4)3@C/graphene) have been prepared by a modified Pechini method. It is first proposed that the graphene oxide can act as a chelating agent in the reaction process. The nanocomposite is characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and element analysis. The composite shows excellent C-rate performance, delivered capacities of 104, 91 and 85 mAh g−1 at 5, 30 and 50 C in the voltage range of 3.0–4.3 V, respectively. Moreover, the cycling performance is also improved in higher voltage range of 3.0–4.8 V. The capacity retention is 83% with the capacity of 131 mAh g−1 at 10 C after 100 cycles. The outstanding features are desirable and enable the material to be an excellent cathode for lithium-ion batteries.

A novel structured Li3V2(PO4)3@C/graphene composite was prepared via a modified Pechini method. The composite shows significantly improved C-rate and cycling performances. The graphene and the coated-carbon can form an electronic conducting network. The coated-carbon on the surface of LVP particles also can partly block the direct contacts between electrolyte and LVP particles, leading to an improved cycling performance in the wider voltage window.Figure optionsDownload as PowerPoint slideHighlights
► Li3V2(PO4)3@C/graphene composite was prepared via a modified Pechini method.
► The cathode material shows significantly improved C-rate and cycling performances.
► It is first proposed that the graphene oxide can act as a chelating agent.
► Graphene could greatly improve the electronic conductivity.
► The coated-carbon can partly block the direct contact between electrolyte and LVP.