Tailored sonochemical synthesis of V2O5|graphene nanoplatelets composites and its enhanced Li-ion insertion properties

By Lim, Daw Gen; Zhao, Yunpu; Manikandan, Palanisamy; Adams, Ryan A.; Youngblood, Jeffrey P.; Pol, Vilas G.
Published in Materials Research Bulletin 2019

Abstract

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|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 ?2 Li+ ion insertion/ extraction. Consequently, the sonochemically tailored One-Step V2O5|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|GNPs cathode at different current 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|GNPs composite cathode yielded less specific capacity of 225 mA h g?1 (10 mA g-1) than the One-Step V2O5|GNPs nanocomposite cathode.

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