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Hierarchical Porous Activated Carbon Obtained by a Novel Heating‐Rate‐Induced Method for Lithium‐Ion Capacitor
Author(s) -
Sun Jing,
Yang Shuhua,
Ai Jingui,
Yang Chao,
Jia Qi,
Cao Bingqiang
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201900366
Subject(s) - materials science , capacitance , power density , lithium (medication) , mesoporous material , cathode , supercapacitor , capacitor , energy storage , porosity , electrochemistry , activated carbon , chemical engineering , electrode , nanotechnology , composite material , voltage , power (physics) , adsorption , chemistry , electrical engineering , thermodynamics , medicine , physics , biochemistry , engineering , organic chemistry , endocrinology , catalysis
Lithium‐ion capacitor (LIC) is an advanced energy storage system due to the combination of high energy density and rapid charge–discharge capability. However, one of the challenges is to improve the specific capacitance and energy density of cathode at high power density. For activated carbon based cathode, the unique hierarchical porous structure and suitable graphitization are crucial for the improvement of the specific capacitance and energy density. Herein, a novel heating‐rate‐induced method is developed to prepare corncob‐derived activated carbons (C‐ACs) with high electrochemical performances. The as‐obtained C‐ACs possess large surface area (1154 m 2 g −1 ), optimal hierarchical porous structure, and suitable graphitization. Particularly, optimal hierarchical porous structure contains not only the high energy storage of the micropores but also the high‐rate performance of the mesopores and macropores. The optimized C‐ACs‐8 electrode exhibits a specific capacitance of 158 F g −1 at 0.5 A g −1 , exciting rate performance, and fast charge transfer capability. A lithium‐ion capacitor device based on C‐ACs‐8 cathode delivers a high energy density of 75 Wh kg −1 at power density of 562 W kg −1 and shows a long cycle life with 86.4% capacitance retention after 1000 cycles.