Solvothermal Synthesis of Organic-Inorganic Cathode Vanadyl Acetate Nanobelts for Aqueous Zinc-Ion Batteries

Organic (acetate)-inorganic (vanadyl) material VO(CH3COO)2 (VA) nanoribbons are synthesized by a simple solvothermal method. As a cathode material for zinc-ion aqueous batteries, the hybrid material exhibits a highly stable reversible specific capacity (239.0 mA h g-1 at 500 mA g-1 and keeps relatively stable after 200 cycles) and recovery rate ability and an excellent long-term circulation ability (131.9 mA h g-1 at 5 A g-1, similar to 0.027 parts per thousand capacity fading per cycle after 1000 cycles). In addition, the capacity variation and electrochemical kinetics of a VA electrode during cycling were studied in detail by Raman measurements and rate cyclic voltammetry measurements. The zinc storage mechanism and crystal structure change information in the charge/discharge process are evaluated by in situ X-ray diffraction (XRD). This work provides enlightening insights for the future research of organo-vanadium hybrids as cathode materials for aqueous batteries.