Porous V2O3/C composite electrodes derived from V-MOF with advanced performance for Zn-ion battery

Abstract

Vanadium oxides are promising cathode materials for Zn-ion batteries. However, they are always suffered from inferior performance because of intrinsic sluggish kinetics, poor conductivity and surface elements dissolution. In this work, porous composite of V2O3 nanoparticles embedded in carbon framework is fabricated by pyrolysis of a Vanadium-base MOF. Attributing to the abundant pores, high specific area and conductive carbon framework, the obtained hierarchical composite delivers a high specific capacity of 240 mAh g−1 at 0.5 A g−1 although the content of carbon is up to 50%, and exhibits a good rate performance with 86.6% retention when the current densities increased from 0.5 to 4 A g−1. Moreover, the cycling performance of the composite is much better than that of commercial V2O3.