成果報告書詳細
管理番号100013723
タイトル*平成20年度中間年報 固体高分子形燃料電池実用化戦略的技術開発 実用化技術開発 長寿命・超軽量なセパレータの研究開発
公開日2009/4/24
報告書年度2008 - 2008
委託先名日立電線株式会社 株式会社日立製作所
プロジェクト番号P05011
部署名燃料電池・水素技術開発部
和文要約以下本編抜粋:1.研究開発の内容及び成果本事業において、日立電線株式会社と株式会社日立製作所は共同で、固体高分子形燃料電池の小型軽量化に寄与できる軽量かつ長寿命な金属セパレータの開発を推進する。ここで日立電線は主にアルミニウムを主体とした軽金属薄肉セパレータ材料、セパレータの開発を行う。一方、株式会社日立製作所はその開発したセパレータ材料の燃料電池化技術を担当する。
英文要約Title: Strategic Development of PEFC Technologies for Practical Application Development of Basic Production Technology Development of Long Life and Lightweight Bipolar Plate (FY2008-FY2009) FY2009 Annual Report : Hitachi Cable, Ltd. and Hitachi, Ltd. have been jointly developing a lightweight metal bipolar plate that can contribute to the long life and reduced size and weight of PEFC stacks. The lightweight metal in this project is a kind of clad metal consisting of an aluminum substrate and titanium cover layers. Hitachi Cable, Ltd. has been developing lightweight metals for use as thin bipolar plate materials based on aluminum as the core metal. On the other hand, Hitachi, Ltd., has developed a fuel cell made of bipolar plate materials for which the same technology is shared. There are four development issues for achieving a longer life bipolar plate and lighter material: (1) utilization of the material, (2) manufacturing technology, (3) simplified evaluation of the thinness of a light metal, and (4) mass production technology. The low cost aims for reducing the quantity of the noble metal to use for conductivity surface coat by contact part of the bipolar plate and the neighboring partial coats and thinning to original a half. A filmy M-coat layer was stable, and the possibility that it could process was shown by the review of the product made in film condition in the M- coat process. Even if about 1/5 of the thickness so far at the time of having been examining it until 2007 fiscal year was thinned, it was clarified to be able to coat below the target resistance of the bipolar plate material. The Ti/Al-alloy/Ti clad (TAT) bipolar plates of a practicable size were designed and produced. The TAT bipolar plates were evaluated characteristic of a single cell. The characteristic test condition of a single cell is shown as follows. Temperature of single cell, anode (An) humidifying water and cathode (Ca) humidifying water were 70℃. Utilization of Hydrogen was 80%, and Oxygen was 40% at each current density. The polarization characteristics of single cell were 0.75V at 0.2A/cm2 and 0.53V at 1.0A/cm2. These cell voltages exceeded our target. Therefore, we were convinced that the stack was able to be produce. TAT bipolar plate stacks will try to produce next year. On the other hand, the long term degradation of small size TAT single cells were evaluated. The endurance test condition of a single cell is shown as follows. The current density was 0.25A/cm2. Temperature of single cell and Ca humidifying water were 70℃. Temperature of An humidifying water was 60℃. The small size TAT single cell was able to operate more than 5,000 hour. The cell voltage was stable until operating time 1,500 hour. After 1,500 hour, the cell voltage was decreased almost constant rate until 5,000 hour. The over potential between An and bipolar plate, Ca and bipolar plate did not have been changed.
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