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成果報告書詳細
管理番号20170000000239
タイトル*平成28年度中間年報 革新型蓄電池実用化促進基盤技術開発(国立大学法人九州大学)
公開日2017/11/14
報告書年度2016 - 2016
委託先名国立大学法人九州大学
プロジェクト番号P16001
部署名スマートコミュニティ部
和文要約
英文要約Title: Research and Development Initiative for Scientific Innovation of New Generation Batteries 2 (RISING 2) (FY2016-FY2018) FY2016 Annual Report,

For achieving the energy density of 500 Wh/kg, two different types of large capacity battery were studied, i.e., environmental-friendly high capacity Li-ion battery using conversion reaction and rechargeable Zn-air battery.

In this fiscal year, to realize the environmental-friendly high capacity Li-ion battery, 2 kinds of composite cathodes were mainly investigated and the following results were obtained; 
FeF3 and Fe2O3 composite cathode: Although FeOF has the highest energy density among the iron-based cathodes, it is difficult to synthesize FeOF by conventional sintering method. To dissolve this problem, FeF3 and Fe2O3 composite cathode was tried as the substitutional cathode of FeOF. FeF3 and Fe2O3 composite cathode obtained by the mechanical milling method at room temperature shows the high initial capacity of 950 mAh/g and it was equivalent to that of FeOF prepared by the melt quenching method.
FeF3 and vanadate glass composite cathode: Although FeF3 has the promising as low cost and high capacity cathode, the charge/discharge over potential is large due to the ionic character. To improve the conductivity, we tried to add the vanadate glass to FeF3 cathode and we succeeded in reducing the charge/discharge overpotential of FeF3. In addition, the cyclability of FeF3 cathode was also improved by the addition of vanadate glass. Even after 10 cycles, reversible capacity more than 400 mAh/g was observed.

For Zn-air battery, reversible air electrode which based on nano structure control carbon based catalyst will be developed. MnO2 shows the high activity to oxygen reduction reaction (ORR), however, low activity to oxygen evolution reaction (OER). Mesoporous MnO2 was prepared by hard templating method and MnO2 single phase with surface area of ca. 80 m2/g and ca. 2 nm meso-pore was prepared. It was found that mesoporous MnO2 consisted of mesoporous nanosheet. Stability of MnO2 air electrode was much increased by introduction of mesoporous structure and Zn-air battery shows stable charge and discharge cycle property over 100 cycles. Mixing mesoporous La0.6Ca0.4CoO3 and MnO2 is effective for decreasing charge potential and stable discharge capacity was sustained over 100 cycles. Mn3O4 with nano-cube structure was also prepared in this study and after calcination in O2 at 423 K, nano-cube Mn3O4 shows stable charge and discharge cycles and 160 cycles with 700 mAh/g-Zn was achieved. Air electrode activity of metal nitrate was also studied and it was found that Ni3FeN sandwiched with N doped reduced graphene oxide (NRGO) shows high activity to ORR and OER reaction. By using Ni3FeN/NRGO for air electrode, stable discharge and charge performance was observed over 180 cycles.
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