▎ 摘　　要

Ultrasound-assisted surface modification of graphene nanoplatelets (GNPs) has made possible for in situ growth of V2O5 nanoparticles; homogeneously decorating inter-connected two-dimensional GNPs. The as-fabricated One-Step V2O5 vertical bar GNPs nanocomposite exhibited enhanced electronic conductivity and facilitates higher Li+ ion insertion/ extraction kinetics, attained the high capacity of 297 mA h g(-1) (10 mA g(-1)) corresponding to similar to 2 Li+ ion insertion/ extraction. Consequently, the sonochemically tailored One-Step V2O5 vertical bar GNPs nanocomposite delivered the specific capacity of 248 mA h g(-1) at 50 mA g(-1) with 83% capacity retention and 98.4% coulombic efficiency for the cycling studies. In addition, the rate capability studies were extended to One-Step V2O5 vertical bar GNPs cathode at different cm-rent density from 10 to 200 mA g(-1). On the other hand, the Two-Step (sonochemical synthesis of 200 nm V2O5 particles followed by its deposition on GNPs) V2O5 vertical bar GNPs composite cathode yielded less specific capacity of 225 mA h g(-1) (10 mA g(-1)) than the One-Step V2O5 vertical bar GNPs nanocomposite cathode.