Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 22, Issue 22, Pages 4677-4685Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201201342
Keywords
gel electrolytes; electric double layer capacitors; carbon electrodes
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Funding
- National Science Council of Taiwan [98-2221-E-006-110-MY3, 101-3113-E-006-010, 101-3113-E-006-011]
- Industrial Technology Research Institute South [B327HK3310]
- Bureau of Energy, Ministry of Economic Affairs, Taiwan [101-D0204-2]
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The synthesis of a gelled polymer electrolyte (GPE) using poly(ethylene glycol) blending poly(acrylonitrile) (i.e., PAN-b-PEG-b-PAN) as a host, dimethyl formamide (DMF) as a plasticizer and LiClO4 as an electrolytic salt for electric double layer capacitors (EDLCs) is reported. The PAN-b-PEG-b-PAN copolymer in the GPE has a linear configuration for high ionic conductivity and excellent compatibility with carbon electrodes. When assembling the GPE in a carbon-based symmetric EDLC, the copolymer network facilitates ion motion by reducing the equivalent series resistance and Warburg resistance of the capacitor. This symmetric cell has a capacitance value of 101 F g-1 at 0.125 A g-1 and can deliver an energy level of 11.5 Wh kg-1 at a high power of 10 000 W kg-1 over a voltage window of 2.1 V. This cell shows superior stability, with little decay of specific capacitance after 30 000 galvanostatic charge-discharge cycles. The distinctive merit of the GPE film is its adjustable mechanical integrity, which makes the roll-to-roll assembly of GPE-based EDLCs readily scalable to industrial levels.
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