Conductive Metal Organic Framework Intercalated Vanadium Oxide Cathode with the Dual Energy-Storage Mechanism for High Capacity and Long Lifespan Aqueous Zinc-Ions Batteries

Vanadium-based materials are promising cathode materials for aqueous rechargeable zinc-ion batteries (ZIBs), but the poor cycling stability and low Zn²⁺ migration kinetics limit their electrochemical performance and practical application.Herein, a conductive MOFs intercalated vanadium oxide cathode with a dual energy-storage mechanism is designed and prepared for high specific capacity and long lifespan ZIBs. The intercalated Ni-BTA can not only enlarge the interlayer spacing of vanadium to improve the Zn²⁺ migration kinetics, but also as the active materials to participate the storage of Zn²⁺. This cathode material exhibits an improved specific capacity of 439.3 mAh g^-1 at 0.2 A g^-1 and excellent long cycle durability over 1000 cycles at 5 A g^-1 with a capacity retention of 82.0%. This work of constructing a conductive MOF intercalated vanadium oxide cathode material with a dual energy-storage mechanism paves a novel way for high-energy secondary batteries.