成果報告書詳細
管理番号20110000000487
タイトル*平成22年度中間年報 次世代自動車用高性能蓄電システム技術開発 次世代技術開発 エネルギー密度の革新を目指した金属ー空気電池の二次電池化
公開日2012/6/27
報告書年度2010 - 2010
委託先名国立大学法人京都大学 独立行政法人産業技術総合研究所
プロジェクト番号P07001
部署名スマートコミュニティ部
和文要約1. 研究開発の内容及び成果等
(1)「空気二次電池のための亜鉛負極の反応制御」(京都大学工学研究科)
添加剤によるデンドライト析出抑制の検討
亜鉛金属を金属?空気二次電池の負極として用いるためには、亜鉛金属の充放電反応である析出溶解を効率よく進行させる必要がある。しかし、亜鉛金属は充電時のデンドライト成長により短絡の危険があることや、形態変化による放電容量の減少などの問題点を有しており、二次電池化のためにはこれらの問題点を解決しなければならない。そこで、形態を制御しながら亜鉛金属を可逆的に析出・溶解させるための電極構成が必要不可欠である。本研究では、アニオン交換性を有するポリマーと共に、酸化亜鉛と炭素導電助剤を用いて亜鉛負極を構築し、アニオン交換液
の導入効果の検討を行った。
英文要約Reversibility in the charge-discharge of zinc electrodes is a crucial issue to construct an advanced metal-air secondary battery. While zinc electrodes have some attracted features as a metal negative electrode such as large discharge capacity, large overpotential for hydrogen evolution, etc, the dendritic growth and the shape change of zinc metal are serious problems to prohibit zinc electrodes from being used in a secondary battery. In order to overcome these problems, we aimed to improve the reversibility of secondary zinc electrodes by introducing anion-exchange ionomers into zinc electrodes. When we constructed zinc electrodes with zinc oxide and carbon without anion-exchange ionomers, only 1st charge-discharge was clearly seen, but consequent charge-discharge processes did not occur. In contrast, we obtained reversible charge-discharge profiles on the zinc electrodes with anion-exchange ionomers. These results indicate that anion-exchange ionomers improve the reversibility of zinc electrodes by depressing the morphology change of zinc electrodes.
Bi-functional catalysts, which are active for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), are desired for air electrodes in metal-air secondary batteries. Perovskite oxides (ABO3) are promising non-noble bi-functional catalysts for metal-air secondary batteries. In this study, perovskite oxides with various compositions were prepared by amorphous citrate method and their catalytic activities for ORR and OER were evaluated in alkaline electrolyte. The behavior of La1-xCaxCoO3 (where x = 0?0.8) was investigated, showing that Ca0.8La0.2CoO3 exhibited better catalytic activities for OER than La0.8Ca0.2CoO3, whereas the ORR performance was similar to each other. It suggests that the alkaline-earth metal, Ca was available as main component of A-site alternative to rare earth such as La. The partial replacement of Co in B-site with transition metals such as Mn, Fe, Ni, and Cu reveals that the addition of Fe (Ca0.8La0.2Co0.5Fe0.4Mn0.1O3) increased the OER performance. The durability of air electrodes in highly-concentrated alkaline solution is now under investigation.

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