2021 Fiscal Year Final Research Report
Development of electric double-layer capacitors with high capacitance and high operating voltage using single-graphene porous electrodes
| Project/Area Number |
19H00913
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
西原 洋知 東北大学, 材料科学高等研究所, 教授 (80400430)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | グラフェン / エッジサイト / キャパシタ / 劣化 |
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| Outline of Final Research Achievements |
This research project investigated the development of electric double-layer capacitors with high capacitance and high operating voltage using single-graphene porous electrodes. Such porous electrodes achieve high operation voltage up to 4.4 V at room temperature even using conventional organic electrolytes because there are few amount of edge sites which cause degradation of electrodes. Moreover, single-graphene property is crucial to achieve a high surface area. However, their areal capacitance was relatively small. This work has resolved this problem by nitrogen doping to the basal plane of graphene walls. Also, this work has revealed the relationship between carbon nanostructures and the electrochemical stability, and the obtained results allow the application to other types of batteries. Furthermore, this work has developed an inexpensive mass-production method of the single-graphene porous materials towards practical applications.
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| Free Research Field |
無機化学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、電気二重層キャパシタの心臓部となる新規カーボン材料の開発を行い、従来よりエネルギー密度と寿命を向上させることに成功した。また、新規カーボン材料を従来のカーボン材料と比較することで、電極材料としてカーボン材料に求められる構造的要素の解明が進んだ。得られた知見は、電気二重層キャパシタ以外の電池にも適用可能であり、本研究で検討した新規カーボン材料の固体高分子形燃料電池のPt担体や、全固体リチウム硫黄電池の正極硫黄担体としての有用性を実証することができた。さらに、社会実装に向け、新規カーボン材料を安価に大量生産する技術も開発できた。
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