Acetylene black coated V2O5 nanocomposite with stable cyclability for lithium-ion batteries cathode

Abstract

Owing to the excellent power density, energy storage capability, and rechargeable nature, lithium-ion batteries are being used in laptops, vehicles, home electronics and large-scale industrial instruments, and thus governing the market of portable electronics. Here, we present the electrochemical performance of the V2O5/acetylene black (V2O5/C) nanocomposite, used as a cathode material in lithium-ion batteries, prepared by a facile chemical synthesis route. The nanocomposite shows an outstanding electrochemical performance with a discharge capacity of 361 mAh g−1 during 1st cycle and retains a capacity of 254 mAh g−1 after 100 cycles, at a step rate of 0.1 C. Further, electrochemical impedance spectroscopy was employed to examine the reaction kinetics before and after cycling and the Li+-diffusion coefficient was calculated to be 1.67 × 10−12 and 6.13 × 10−15 cm2 s−1, respectively. The enhanced electrochemical performance of V2O5/C nanocomposite can be ascribed to the synergistic effect of nanosized V2O5 and conductive acetylene black, which could shorten diffusion pathway, play a role of efficient charge carrier and make the electrode have better electronic/ionic conductivity and lower resistance. Hence, V2O5/C nanocomposite could be utilised as promising cathode material for lithium-ion batteries because of its stable electrochemical performance.