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Stacking‐Controlled Assembly of Cabbage‐Like Graphene Microsphere for Charge Storage Applications
Author(s) -
Kim Sun Kyung,
Lee Byeongyong,
Ha Taehyeong,
Park SuRyeon,
Chang Hankwon,
Lee Seung Woo,
Jang Hee Dong
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201801948
Subject(s) - graphene , materials science , supercapacitor , gravimetric analysis , capacitance , oxide , microstructure , graphene foam , stacking , nanotechnology , energy storage , graphene oxide paper , chemical engineering , electrode , composite material , chemistry , metallurgy , power (physics) , physics , organic chemistry , quantum mechanics , engineering
Nanostructured graphene electrodes generally have a low density, which can limit the volumetric performance for energy storage devices. The liquid‐phase mild reduction process of graphene oxide sheets is combined with the continuous aerosol densification process to produce high‐density graphene agglomerates in the form of microspheres. The produced graphene assembly shows the cabbage‐like morphology with a high density of 0.75 g cm −3 . In spite of such high density, the cabbage‐like graphene microspheres have narrow‐ranged mesopores and a high surface area. The cabbage‐like graphene microsphere exhibits both high gravimetric and volumetric energy densities due to the optimized microstructure, which shows a high gravimetric capacitance of 177 F g −1 and volumetric capacitance of 117 F cm −3 in supercapacitors. As a cathode for lithium‐ion capacitors, the cabbage‐like graphene delivers a reversible capacity of ≈176 mAh g −1 . The stacking‐control approach provides a new pathway to control the microstructure of the graphene assembly and corresponding charge storage characteristics for energy storage applications.