成果報告書詳細
管理番号20130000000486
タイトル*平成24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 (11)
公開日2013/12/25
報告書年度2012 - 2012
委託先名国立大学法人横浜国立大学
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In this project, we are attempting to realize a novel lithium-air secondary battery by using solvate ionic liquid electrolytes. Because of a diversity of design for their chemical structures as well as remarkable properties, the ionic liquids have been used in many applications including special conditions (e.g., in vacuum system), and allowed task-specific design of the liquid materials suitable for the situation. We can exploit these advantages in the ionic liquids for designing battery electrolytes applicable to the novel lithium-air secondary batteries. Since the solvate ionic liquids are inherently non-flammable, less-volatile, highly lithium-conductive, and highly stable against oxidative reaction, they are expected to be more suitable for the electrolytes of the lithium-air batteries operated in open-air condition, compared to common organic electrolytes. Moreover, a diversity of the design enables us to introduce more hydrophobic property into the solvate ionic liquids. In this project, we also attempt to fabricate lithium-air battery systems composed of not only lithium metal but also graphite as the negative electrode. Final goal of this project is to evaluate the possibility of the battery operation with humidified oxygen or real air using the solvate ionic liquid electrolytes, and realize the lithium-air battery that allows the energy density of 500 Wh/kg over 50 cycles of reversible charge-discharge.
We confirmed reversible redox reaction of oxygen in the solvate ionic liquid electrolyte using electrochemical methods. This oxygen reduction reaction will be further studied using gas chromatography-mass spectroscopy coupled with the electrochemical measurement, which was installed successfully in this year. We also succeeded preparation of more hydrophobic ionic liquids with different ligands. It was found that both lithium metal and graphite anodes showed highly reversible charge-discharge reactions in the solvate ionic liquids with higher Coulombic efficiency than that for organic electrolytes. Reversible charge-discharge cycle was successfully performed under pure oxygen flow using lithium metal as the negative electrode, the solvate ionic liquid as the electrolyte, and porous carbon (Ketjen Black)-polytetrafluoroethylene (PTFE) composite electrode as the positive air electrode.
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