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Electrochemical Activation of Expanded Graphite Electrode for Electrochemical Capacitor
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ka, Bok H. | - |
dc.contributor.author | Oh, Seung M. | - |
dc.date.accessioned | 2009-07-30T03:06:20Z | - |
dc.date.available | 2009-07-30T03:06:20Z | - |
dc.date.issued | 2008 | - |
dc.identifier.citation | J. Electrochem. Soc., 155, A685 (2008) | en |
dc.identifier.issn | 0013-4651 | - |
dc.identifier.uri | https://hdl.handle.net/10371/5921 | - |
dc.description.abstract | An expanded graphite (e-MCMB, mesocarbon microbeads) having a wider interlayer spacing (d002 = 0.404 nm) than that of
common graphites is prepared by heat-treatment of an oxidized MCMB. When the e-MCMB electrode, which gives a negligible capacitance due to a small surface area, is polarized over a certain onset potential [4.6–4.8 V (vs Li/Li+) for positive and 1.3–1.0 V for negative direction], it is electrochemically activated to be a high-capacitance positive and negative electrode for electrochemical capacitor. The activation process involves an ion intercalation into the interlayer space to generate ion-accessible sites. The intercalation is evidenced by the presence of a voltage plateau in the charge–discharge profiles, and by the widening of the interlayer distance (by in situ X-ray diffraction study) and concomitant electrode swelling (by electrochemical dilatometr) that occur at the same potential region. The electrochemically activated e-MCMB particles carry slitlike pores of ca. 0.45 nm in the mean interlayer distance, into which ions very likely enter either bare or with partial solvent shells with a mixed adsorption/ intercalation charge storage behavior. A full cell fabricated with two e-MCMB electrodes delivers a volume specific capacitance of 30–24 F mL−1 within 100 cycles for a dry electrode pair at a working voltage of 3.7 V. | en |
dc.description.sponsorship | This work was supported by KOSEF via the Research Center for
Energy Conversion and Storage. | en |
dc.language.iso | en | - |
dc.publisher | Electrochemical Society | en |
dc.title | Electrochemical Activation of Expanded Graphite Electrode for Electrochemical Capacitor | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 오승모 | - |
dc.identifier.doi | 10.1149/1.2953525 | - |
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