Capacitive Organic Anode Based on Fluorinated-Contorted Hexabenzocoronene: Applicable to Lithium-Ion and Sodium-Ion Storage Cells
발표자
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초록
내용
Herein, we introduce fluorine atoms into contorted hexabenzocoronene (cHBC) to achieve the first small-molecule-based organic capacitive energy storage cells that operate at high current rate with decent specific capacity of ~160 mA h g−1 also provide a superior cycle capability (＞ 400) without significant alteration. This high capacitive behavior in the P21/c crystal phase of fluorinated cHBC (F–cHBC) is caused mainly by the fluorine atoms at the end of each peripheral aromatic ring. The most electronegative fluorine atoms accelerate ion diffusion on the surface to promote fast Li+ ion uptake and release by applied current. Moreover, the F–cHBC has potential applications as the capacitive anode in Na-ion sodium storage cell. The fast dynamics of the electric double layer on the surface of F–cHBC enables to deliver specific capacity of 65 mA h g−1 at a high current of 4000 mA g−1.