成果報告書詳細
管理番号20150000000241
タイトル*平成26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 (13)
公開日2015/5/26
報告書年度2014 - 2014
委託先名国立大学法人岩手大学
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 for Next-generation Metal-Air Batteries (Iwate University)

The rechargeable metal-air battery is expected to become one of the most widely used batteries in the future. Since the energy density of a Li-ion rechargeable battery is as low as 200 Wh/kg, rechargeable batteries with higher energy density are desirable. Metal-air rechargeable batteries have much higher theoretical capacitance (1350 Wh/kg (Zn)) 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), an electrocatalyst for ORR and OER was proposed in this project. The RP-LaSr3Fe3O10 electrocatalyst was used in gas diffusion electrode.
The RP-LaSr3Fe3O10 pellet-type electrode with a gas diffusion channel network (template: hydrocarbon and carbon materials) showed higher ORR and OER activity than normal RP-LaSr3Fe3O10 pellet-type electrode. Uniformity of the PTFE as a water repellent agent in the RP-LaSr3Fe3O10 pellet-type electrode had an influence on the electrode properties. The supply method of the feeding gas was evaluated by using the improved H-type cell, and it was found that rate of feeding gas had an influence on ORR rate. On the basis of these results, the RP-LaSr3Fe3O10 electrocatalyst can be expected to be a high-performance electrocatalyst for ORR and OER at the air electrode of metal-air rechargeable batteries.
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