N-Methylpyrrolidone assisted tetrachlorobenzoquinone intercalating V2O5 as cathode for aqueous zinc-ion battery

Abstract

Vanadium oxide (V₂O₅) is intercalated by tetrachlorobenzoquinone (TCB) through a one-step solvothermal method in an N-methylpyrrolidone (NMP)/water solvent mixture. The insertion and synergy of TCB and NMP widen the lattice and expand crystal particles, promoting Zn²⁺ ion transfer and coordination, which endow s-NMP–TCB–V₂O₅ with an improved capacity of 452 mA h g⁻¹ as well as outstanding capacity retention of 85.6% after 1500 cycles.