Journal
JOURNAL OF POWER SOURCES
Volume 300, Issue -, Pages 216-222Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.09.065
Keywords
EDLC; Binder; Starch; Areal capacitance; Electrodes; Water processing
Funding
- Helmholtz Institute Ulm (Karlsruhe Institute of Technology)
- Bundesministerium fur Bildung und Forschung (BMBF) [03EK3010]
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Potatoes starch (PS), a natural polymer obtainable from non-edible sources, is for the first time evaluated as alternative water-processable binder for Electrochemical Double-Layer Capacitor (EDLC) electrodes. Morphological and electrochemical properties of activated carbon (AC)-based electrodes are investigated and compared to those achieved with the state-of-the-art aqueous binder (CMC, i.e. Na-carboxymethyl cellulose). The obtained results suggest substantial benefits of PS, in particular regarding the electrode fabrication process. As a matter of fact, owing to its amylopectin content (moderately branched polysaccharide), PS displays only minimal shrinkage upon drying, resulting on rather homogeneous electrodes not presenting the dramatic surface cracking observed with CMC. Furthermore, owing to the smaller volume of water required for the processing, much higher active material loading per area unit can be achieved. This is reflected on improvements of up to 60% in terms of areal capacitance. (C) 2015 Elsevier B.V. All rights reserved.
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