3D Oxygen-Defective Potassium Vanadate/Carbon Nanoribbon Networks as High-Performance Cathodes for Aqueous Zinc-Ion Batteries
- Publication Type:
- Journal Article
- Small Methods, 2020, 4 (1)
- Issue Date:
|3D Oxygen-Defective Potassium Vanadate Carbon Nanoribbon Networks as High-Performance Cathodes for Aqueous Zinc-Ion Batteries.pdf||Published Version||4.04 MB|
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© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Rechargeable aqueous zinc-ion batteries (ZIBs) have attracted extensive interest owing to their low cost and high safety. Herein, oxygen-defective potassium vanadate/amorphous carbon nanoribbons (C-KVO|Od) are successfully synthesized through a one-step solid-state sintering process as a high-performance cathode material for ZIBs. This unique 3D interconnected network structure can not only act as a continuous conductive path but also decrease aggregation and provide more adsorption sites for zinc ions. The as-prepared C-KVO|Od exhibits 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 elucidate that the oxygen defects in the C-KVO|Od remarkably reduce the Zn2+ ion's adsorption Gibbs free energy and Zn2+-diffusion barriers. Meanwhile, the amorphous carbon networks enable the rapid electron transfer and provide additional active sites for Zn2+ storage. This work can facilitate the development of high-performance ZIBs for large-scale energy storage.
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