3D Oxygen‐Defective Potassium Vanadate/Carbon Nanoribbon Networks as High‐Performance Cathodes for Aqueous Zinc‐Ion Batteries

• DOI: 10.1002/smtd.201900670
• Publication Date: 2019-10-16T20:58:33Z
• Authors: Wang Yang; Liubing Dong; Wu Yang; Chengjun Xu; Guangjie Shao; Guoxiu Wang
• Keywords: Carbon fibers; Vanadate

Abstract 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|O d ) are successfully synthesized through a one‐step solid‐state sintering process as high‐performance cathode material for ZIBs. This unique 3D interconnected network structure can not only act continuous conductive path but also decrease aggregation provide more adsorption sites zinc ions. The as‐prepared C‐KVO|O exhibits capacity of 385 mAh g −1 at 0.2 A , superior rate performance (166 even 20 ), an outstanding cycling stability with 95% retention over 1000 cycles. Density functional theory calculations elucidate that the oxygen defects in remarkably reduce Zn 2+ ion's Gibbs free energy ‐diffusion barriers. Meanwhile, amorphous networks enable rapid electron transfer additional active storage. work facilitate development ZIBs large‐scale