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High Performance, Flexible, Solid‐State Supercapacitors Based on a Renewable and Biodegradable Mesoporous Cellulose Membrane
Author(s) -
Zhao Dawei,
Chen Chaoji,
Zhang Qi,
Chen Wenshuai,
Liu Shouxin,
Wang Qingwen,
Liu Yixing,
Li Jian,
Yu Haipeng
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201700739
Subject(s) - supercapacitor , materials science , electrolyte , capacitance , mesoporous material , bacterial cellulose , chemical engineering , cellulose , membrane , electrode , separator (oil production) , quasi solid , phase inversion , nanotechnology , dye sensitized solar cell , organic chemistry , chemistry , biochemistry , physics , engineering , thermodynamics , catalysis
A flexible, transparent, and renewable mesoporous cellulose membrane (mCel‐membrane) featuring uniform mesopores of ≈24.7 nm and high porosity of 71.78% is prepared via a facile and scalable solution‐phase inversion process. KOH‐saturated mCel‐membrane as a polymer electrolyte demonstrates a high electrolyte retention of 451.2 wt%, a high ionic conductivity of 0.325 S cm −1 , and excellent mechanical flexibility and robustness. A solid‐state electric double layer capacitor (EDLC) using activated carbon as electrodes, the KOH‐saturated mCel‐membrane as a polymer electrolyte exhibits a high capacitance of 110 F g −1 at 1.0 A g −1 , and long cycling life of 10 000 cycles with 84.7% capacitance retention. Moreover, a highly integrated planar‐type micro‐supercapacitor (MSC) can be facilely fabricated by directly depositing the electrode materials on the mCel‐membrane‐based polymer electrolyte without using complicated devices. The resulting MSC exhibits a high areal capacitance of 153.34 mF cm −2 and volumetric capacitance of 191.66 F cm −3 at 10 mV s −1 , representing one of the highest values among all carbon‐based MSC devices. These findings suggest that the developed renewable, flexible, mesoporous cellulose membrane holds great promise in the practical applications of flexible, solid‐state, portable energy storage devices that are not limited to supercapacitors.