Sheet-like Li3V2(PO4)3 nanocomposite coated by SiO2 + C with better electrochemical properties for lithium-ion batteries

Sheet-like Li3V2(PO4)(3) nanocomposite coated by SiO2 + C layer was synthesized with one-step solid-state method. Dihydroxydiphenylsilane (DPSD) was used as the source of SiO2 and C. The sheet-like Li3V2(PO4)(3) nanocomposite has a thickness in the range of 20-30 nm. Because of the SiO2 + C-coated layer and the sheet-like morphology, the Li3V2(PO4)(3)/(SiO2 + C) composites show better stability and higher capacity than pure Li3V2(PO4)(3) material and granular Li3V2(PO4)(3)/(SiO2 + C) composites. The best sample, Li3V2(PO4)(3)/(SiO2 + C)(2:8), shows a discharge capacity of 193.7 mAh g(-1) at 1C within the voltage range of 3.0-4.8 V and retains almost 90 % of the capacity after 50 cycles.