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Rechargeable aqueous zinc-ion batteries have attracted extensive interest owing to their low cost and high safety. Herein, oxygen-defective potassium vanadate/amorphous carbon nanoribbons (C-KVO|O d) is successfully synthesized through a one-step solid-state sintering process as a high performance cathode material for zinc-ion batteries. This unique 3D interconnected network structure can not only act as continuous conductive path, but also decreases aggregation and provide more adsorption sites for zinc ions. The as-prepared C-KVO|O d exhibites a high capacity of 385 mAh g-1 at 0.2 A g-1 , superior rate performance (166 mAh g-1 even at 20 A g-1) and an outstanding cycling stability with a 95% capacity retention over 1000 cycles. Density functional theory calculations elucidated that the oxygen defects in the C-KVO|O d remarkably reduced Zn 2+ ion adsorption Gibbs free energy and Zn 2+-diffusion barriers. Meanwhile, the amorphous carbon networks enable the rapid electron transfer and provide additional active sites for Zn 2+ storage. This work could facilitate the development of high-performance zinc-ion batteries for large-scale energy storage.

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