成果報告書詳細
管理番号20110000001583
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 4d遷移金属コンバージョン系による高容量正極材料の研究開発
公開日2014/3/11
報告書年度2010 - 2010
委託先名国立大学法人東京大学
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
英文要約Lithium-ion batteries offer highest energy density among the existing rechargeable batteries. The upper limit of the reversible capacity is determined by the crystallographic sites that can accommodate lithium ions. Thereby, one possible option toward higher capacity is in a reversible conversion reaction, where the crystal is destroyed during reduction and recovered upon oxidation. With this reaction, multi-valence states can be accessed to produce huge capacity. Most of the previous research has focused on using conversion reaction for the anode side. In this project, we try to apply this large-capacity reaction to the cathode side. We have picked up 4d transition metal oxides with respect to their high electronic conductivity as well as its ability to access multi-valence state within relatively narrow voltage window. The target systems of last year were RuO2.nH2O and (MoxRu1-x)O2.nH2O. In order to improve the charge-discharge cyclic property, we have studied the effects of the characteristics of the electrode constituent materials, morphology and some new additives. We have also studied the effect of compounding the oxide materials to expand the width of the material option for the conversion reaction electrode. Uniform decentralization of the electrode constituent materials by a small unit and the addition of an appropriate resin improved the charge-discharge cycle characteristic. Ruthenium-molybdenum composite oxide powder particle was successfully synthesized. The conversion electrode of the compound oxide showed theoretical charge-discharge capacity. That is, compounding the oxide opened the possibility for the great improvement of the width of the material option for the conversion reaction electrode.
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