GUO Pingchun, HAN Xing, JIANG Hedong, LI Jiake, FAN Xueyun, HUANG Liqun, SUN Jian, WANG Yanxiang
(Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China)
Abstract: Metal-organic frameworks (MOFs) have received much attention in the field of electrochemistry owing to their high specific surface area, adjustable aperture and tunable structure. A typical V-MOF was synthesized by using hydrothermal methods, where the effects of hydrothermal time on crystalline phase composition and microstructure of V-MOF and its performance for aqueous zinc-ion batteries (AZIBs) were explored. The resulting V-MOF material, a hollow nanorod with a valence of +4 for V after hydrothermal reaction for 36 h, has the highest electrochemical performance as an anode for AZIBs, with a specific capacity of 144.5 mAh·g−1 at a current density of 100 mA·g−1. At a current density of 1000 mA·g−1, the Coulomb efficiency remained at 100% after 4000 charge/discharge cycles.
Key words: aqueous zinc-ion batteries; vanadium based metal-organic framework; cathode; hydrothermal synthesis; electrochemical performance