Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Volume 77 , Issue 9
Showing 1-15 articles out of 15 articles from the selected issue
  • Yasuo TAKEDA, Nobuyuki IMANISHI, Osamu YAMAMOTO
    2009 Volume 77 Issue 9 Pages 784-797
    Published: September 05, 2009
    Released: March 22, 2012
    In this review, our results of over ten years of research on the all-solid-state polymer electrolyte lithium secondary cell are introduced. The conductivity of polyethylene oxide (PEO)-based polymer electrolytes, which is the best candidate for polymer electrolyte lithium cells, and the interface resistance between PEO and the electrodes have been improved by the addition of BaTiO3. New composite anodes of Li2.6Co0.4N and metal oxides have been proposed for the polymer electrolyte cells. The composite anode has a high reversible capacity and a low irreversible capacity at the first cycle. A carbon anode for the polymer electrolyte lithium cell has also been developed and mesocarbon micro beads exhibit high electrochemical performance. 4-volt class all-solid-state polymer electrolyte cells with the PEO-Li(CF3SO2)2N-LiPF6-BaTiO3 electrolyte have been proposed that have good reversible charge-discharge performance.
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  • Koichi UI, Hirokazu SAKAI, Ken TAKEUCHI, Guo-ping LING, Nobuyuki KOURA
    2009 Volume 77 Issue 9 Pages 798-800
    Published: September 05, 2009
    Released: March 22, 2012
    The electrodeposition of the Nb3Sn alloy film from the Lewis basic NbCl5-SnCl2-EMIC melt (50 mol%<EMIC) was investigated. The relationship between melting point or glass transition point and molar fraction of NbCl5 was constructed for the NbCl5-EMIC system, which showed a melting point less than room temperature in the range of 10.0 mol%≤molar fraction of NbCl5≤33.3 mol%. From the results of the cyclic voltammograms, the possibility of electrodeposition of the Nb3Sn alloy film was suggested from the Lewis basic melt. The Nb3Sn alloy film was reproducibly obtained from the 19.2 mol% NbCl5–10.0 mol% SnCl2–70.8 mol% EMIC bath using a constant current pulse electrodeposition method at 0.1 A cm−2 with a pulse period of 10 ms, duty ratio of 0.20, and electricity of 50°C cm−2 at 130°C, although the existence of the metallic Sn simple substance and the Cu-Sn alloy in the film was confirmed by an XRD analysis.
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Technological Rports
  • Junpei YAMANAKA, Takayuki KOIZUMI, Akiyasu OKUNO, Masaharu KAJITA
    2009 Volume 77 Issue 9 Pages 808-811
    Published: September 05, 2009
    Released: March 22, 2012
    Breakage of beta alumina, that was used as solid electrolyte of sodium-sulfur (NAS) battery, by calcium impurities was evaluated. The Breakage generated from the inner surface of beta alumina tube. A hetero-phase of calcium oxide was observed at the beginning point and the oxide was compound of calcium, sodium and aluminum. The inner surface made oxygen defect part by contacting with sodium and calcium reached this oxygen defect and form the hetero-phase on charging. This caused a deterioration of strength by develop inside the beta alumina and breakage.
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  • Yoichiro KURITA, Norikazu MOTOHASHI, Satoshi MATSUI, Koji SOEJIMA, Shu ...
    2009 Volume 77 Issue 9 Pages 812-817
    Published: September 05, 2009
    Released: March 22, 2012
    We have developed a new Die-to-Wafer (D2W) bonding process for a 3-D packaging technology called SMAFTI (SMArt chip connection with FeedThrough Interposer), which enables over a thousand parallel interconnects between memory and logic dies. The bonding process achieved metal/adhesive simultaneous bonding between die and wafer. We also characterized the interlaminar horizontal wiring of FTI (Feed Through Interposer) by Sparameter measurement and confirmed its potential for high frequency transmission at over 10 GHz.
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