Capacitive Organic Anode Based on Fluorinated‐Contorted Hexabenzocoronene: Applicable to Lithium‐Ion and Sodium‐Ion Storage Cells

• DOI: 10.1002/advs.201801365
• Publication Date: 2018-11-02T08:18:47Z
• Authors: Jaehyun Park; Cheol Woo Lee; Ju Hyun Park; Se Hun Joo; Sang Kyu Kwak; Seokhoon Ahn; Seok Ju Kang
• Keywords: Fluorine

Abstract Conducting polymer‐based organic electrochemical capacitor materials have attracted attention because of their highly conductive nature and reversible redox reactions on the surface electrodes. However, owing to poor stabilities in aprotic electrolytes, alternative capacitive electrodes are being actively sought. Here, fluorine atoms introduced into contorted hexabenzocoronene (cHBC) achieve first small‐molecule‐based energy‐storage cells that operate at high current rates with satisfactory specific capacities ≈160 mA h g −1 superior cycle capabilities (>400) without changing significantly. This behavior P2 1 /c crystal phase fluorinated cHBC (FcHBC) is caused mainly by end each peripheral aromatic ring. Combined Monte Carlo simulations density functional theory (DFT) calculations show most electronegative accelerate ion diffusion promote fast Li + uptake release an applied current. Moreover, FcHBC has potential applications as anode Na‐ion storage cells. The dynamics its allow it deliver a capacity 65 4000 .