| Project/Area Number |
21K18835
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 26:Materials engineering and related fields
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| Research Institution | Shibaura Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2021-07-09 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | i空気電池 / カーボン系材料 / 触媒 / 深共晶溶媒 / 酸素の酸化還元反応 / Li空気電池 |
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| Outline of Research at the Start |
本課題では、長寿命で高性能なLi空気電池を実現させるために、酸素の酸化還元反応を促進
できるカーボン複合体・酸化物からなる複合触媒材料（正極触媒材料）の合成技術の開発と酸素の酸化反応を促進可能な液体触媒となる深共晶溶媒(Deep Eutectic Solvents; DES)の触媒能発現メカニズムの解明を行う。触媒能を示すDESのイオン伝導性や粘性等の諸特性を計測し、機能発現に寄与する因子を明らかにし、新しいDES触媒を設計する。正極触媒、DES触媒、Redox mediator(RM)触媒を利用し、マルチ触媒のシナジー効果を発現させる最適解を解明し、高性能Li空気電池を創製する。
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| Outline of Final Research Achievements |
In this study, synthesis of heteroatom-doped carbon composite materials (HCC), metal oxide nanoparticles (MON), and composite materials composed of HCC and MON, were performed. In addition, deep eutectic solvents (DESs) having catalytic property for oxygen redox reaction were explored and the physicochemical properties of the DESs were investigated. Battery performance of Li-oxygen batteries (LOB) using the composite materials as cathode, lithium as anode, and the DESs as electrolyte was also investigated. DESs were prepared by mixing N-methylacetamide (NMA) and LiNO3 at constant rates. The battery performance of LOB using the DESs as electrolytes was evaluated. In this case, the overpotentials for discharge and charge was lower than the LOB using conventional electrolyte. The charge and discharge potentials were found to be 3.6 and 2.7 V, respectively, revealing that the DESs could lead to reduction in charge overpotentials.
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| Academic Significance and Societal Importance of the Research Achievements |
異種元素ドープカーボン材料と酸化物ナノ粒子の複合材を合成したことにより、酸素の酸化還元反応の両面に対して触媒機能を発現できるようになった。これは、Li空気電池の実用化に向けて前進させる結果である。また、深共晶溶媒をLi空気電池の電解液として使用可能であること、また、深共晶溶媒が充電過電圧を低減できることを明らかにできたことは、Li空気電池の性能を向上させる上で、有意義な知見であると考えられる。
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