Journal
ADVANCED ENERGY MATERIALS
Volume 7, Issue 18, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201700739
Keywords
cellulose; flexible electronics; membranes; polymer electrolytes; solid-state supercapacitors
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Funding
- National Natural Science Foundation of China [31622016, 31670583]
- Natural Science Foundation of Heilongjiang Province of China [JC2016002]
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A flexible, transparent, and renewable mesoporous cellulose membrane (mCel-membrane) featuring uniform mesopores of approximate to 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.
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