TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 2011, Issue 246
Displaying 1-10 of 10 articles from this issue
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Preface
Special Reviews
Short Papers
  • Preparation and capacitor performance of composites based on mesoporous carbon/nanofibrous carbons
    Minato Egashira, Mizue Itoh, Masahiro Tokita, Nobuko Yoshimoto, Masayu ...
    Article type: Short Paper
    2011Volume 2011Issue 246 Pages 6-10
    Published: January 14, 2011
    Released on J-STAGE: February 18, 2011
    DOIhttps://doi.org/10.7209/tanso.2011.6
    JOURNAL FREE ACCESS
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    Composites have been prepared by the carbonization of an ordered mesoporous carbon precursor coated on nano-carbon substrates for high-rate double-layer capacitor electrodes. The reproducibility of mesopore structure at 3.8 nm depends on the carbonization conditions, the loading amount of precursor, and the substrate. The specific surface area of the composite based on vapor grown carbon fiber (VGCF) reaches 250 m2 g−1 and has unique pore characteristics. The test cell with the composite based on VGCF exhibited ca. 4 F g−1 of specific capacitance at best and maintained the capacitance under high-rate conditions. The capacitance of the test cell with the composite electrodes depends on the pore structure of the composite.
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Review Paper
  • Analysis of inner-pore structure of carbon materials using Li and Xe NMR
    Kazuma Gotoh
    Article type: Review Paper
    2011Volume 2011Issue 246 Pages 11-15
    Published: January 14, 2011
    Released on J-STAGE: February 18, 2011
    DOIhttps://doi.org/10.7209/tanso.2011.11
    JOURNAL RESTRICTED ACCESS
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    Closed pores in non-graphitazable carbon (hard carbon) are the reason for some unique properties for lithium intercalation. Our group investigated intercalated Li in hard carbon, which is used for the anode active material of lithium ion batteries for electric vehicles, using solid state 7Li NMR. The correlation between deposition of lithium clusters in the pores and the state of charge were elucidated. The growth of the porous structure of hard carbon was also investigated using 129Xe NMR porosimetry. Xe NMR could evaluate pores in hard carbon that were hard to investigate by adsorption isotherm measurement. A Li NMR study for a ternary graphite intercalation compound consisting of alkylamine and Li is also presented.
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