Determining water content in activated carbon for double-layer capacitor electrodes

Karl–Fisher titration is used to estimate water contents in activated carbon and the distribution of impurity-level water in an activated carbon–solvent system. Normalization of the water content of activated carbon is attempted using vacuum drying after immersion in water was controlled. Although v...

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Bibliographic Details
Published in:Journal of power sources 2016-09, Vol.326, p.635-640
Main Authors: Egashira, Minato, Izumi, Takuma, Yoshimoto, Nobuko, Morita, Masayuki
Format: Article
Language:English
Subjects:
Activated carbon
Double-layer capacitor
Water content
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Summary:Karl–Fisher titration is used to estimate water contents in activated carbon and the distribution of impurity-level water in an activated carbon–solvent system. Normalization of the water content of activated carbon is attempted using vacuum drying after immersion in water was controlled. Although vacuum drying at 473 K and 24 h can remove large amounts of water, a substantial amount of water remains in the activated carbon. The water release to propylene carbonate is less than that to acetonitrile. The degradation of capacitor cell capacitance for activated carbon with some amount of water differs according to the electrolyte solvent type: acetonitrile promotes greater degradation than propylene carbonate does. •Water content in activated carbon was estimated.•Karl–Fisher titration was applied for the contacted solvent.•Water release from activated carbon differs by the kind of solvent.•Capacitance degradation is related to the water content in activated carbon.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2016.03.110