Core-shell Li3V2(PO4)3@C composites as cathode materials for lithium-ion batteries

Core-shell Li3V2(PO4)(3)@C nanostructured composites were prepared via a sol-gel route followed by hydrothermal treatment. XRD patterns showed that Li3V2(PO4)(3) has a monoclinic structure with space group P2(1)/n. TEM images exhibited that Li3V2(PO4)(3) Particles are encapsulated with a carbon shell similar to 10 nm in thickness. Compared with pure Li3V2(PO4)(3), core-shell Li3V2(PO4)(3)@C composites presented enhanced electrochemical Li ion intercalation performances. Cyclic voltammetry and electrochemical impedance spectroscopy disclosed that carbon shells improved Li ion diffusion and electrical conductance significantly and also retarded formation of solid electrolyte interphase film of Li3V2(PO4)(3) cathode materials.