High Capacitance Based on Vacancy Defective Porous Carbon in Ionic Liquid

• DOI: 10.1002/adfm.202401045
• Publication Date: 2024-04-27T04:21:10Z
• Authors: Shihao Feng; Qian Zhao; Junjun Wang; Wei Zhang; Weixiao Wang; Ming Xu; Liang Zhou; Liqiang Mai; Dongyuan Zhao; Yong Liu
• Keywords: Carbon fibers

Abstract Porous carbons have been extensively studied in electrochemical capacitors (ECs). However, low capacitance remains a limitation due to the electrical double layer (EDL) storage mechanism when porous are used ionic liquids (ILs) based ECs. Herein, nitrogen‐derived vacancy defects carbon nanospheres found which can boost capacitive charge and present reversible high of 427 F g −1 pure IL electrolyte, equal normalized area (C A ) 16 µF cm −2 , surpassing theoretical EDL C (≈11 ). When as cathode, assembled Lithium hybrid capacitor express energy density 635 Wh kg on active material under much high‐power 14.5 kW . combination control experiments functional theory investigation indicate that EC's performance improvement mostly stems from strong interactions at defects, triggering extraordinary faradaic capacitance. The results shed light defect engineering for realizing extra materials, open up new opportunities improving density.