成果報告書詳細
管理番号20140000000243
タイトル*平成25年度中間年報 革新型蓄電池先端科学基礎研究事業 革新型蓄電池先端科学基礎研究開発 (12)
公開日2014/5/17
報告書年度2013 - 2013
委託先名国立大学法人北海道大学
プロジェクト番号P09012
部署名スマートコミュニティ部
和文要約
英文要約Development of Reversible Air Electrodes with Layered Perovskite Oxides, Layered Cobalt Oxide,
and Brownmillerite-type Oxide for Next-generation Metal-Air Batteries (Hokkaido University)

The rechargeable metal-air battery, which is expected to become one of the most widely used batteries in the future. Since the capacitance of a Li-ion rechargeable battery is as low as 200 Wh/kg, rechargeable batteries with higher capacitance are desirable. Although,metal-air rechargeable batteries have much higher theoretical capacitance (8228 Wh/kg(Al)) than that of Li-ion rechargeable batteries.
To improve the efficiency of the batteries, there are several challenging issues worth being studied.
These include the slow kinetics of discharging and charging reactions at the air electrode, i.e., oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) on electrode catalysts. A ruddlesden-popper-type layered (RP)perovskite LaSr3Fe3O10 (n=3), electrocatalyst for ORR and OER was proposed in this project. And, the double-perovskite manganese oxide BaYMn2O5+δ, the layered cobalt oxide, YBaCo4O7+δ and brownmillerite-type Ca2FeCoO5 were also proposed in this project.
The RP-LaSr3Fe3O10 shows the highest ORR and OER activity as compared with BaYMn2O5+δ, the layered cobalt oxide,-YBaCo4O7+δ and brownmillerite-type Ca2FeCoO5 electrocatalysts. The RP-LaSr3Fe3O10 electrocatalyst was applied to gas diffusion electrode. With passively feeding of 4.0 dm-3 KOH solution and air at room temperature, the electrode shows current density of 20mAcm-2 at 0.9V vs. RHE.
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