2022 Fiscal Year Final Research Report
Development of Anion GICs Using Highly Concentrated Aqueous Solutions and Their Application to Energy Storage Devices
| Project/Area Number |
20H02842
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 36020:Energy-related chemistry
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
若林 裕助 東北大学, 理学研究科, 教授 (40334205)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 蓄電池 / グラファイト層間化合物 / アニオン |
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| Outline of Final Research Achievements |
From an elemental strategic point of view, there is a need to construct cathodes for rechargeable batteries that do not contain cobalt or nickel. In addition, to enhance the safety of batteries, it is desirable to use an aqueous solution as the electrolyte. As an approach to solve these problems, this study aimed to construct a battery cathode using an anionic GIC, a graphite intercalation compound in which anions are inserted into graphite material. The insertion species of fluorine-containing anions, which have particularly high oxidation resistance, were investigated, and it is found that anions with long chain lengths tend to remain in the graphite interlayer after insertion, impairing the reversibility of intercalation/deintercalation. These results provide useful insight into the proper selection of anion species when using anionic GICs as battery materials.
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| Free Research Field |
電気化学
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| Academic Significance and Societal Importance of the Research Achievements |
アニオンGICを利用した正極活物質は、元素戦略的に有利であるだけでなく、有機溶媒に起因する環境負荷や製造コストを低減することが期待されている。しかし、挿入種であるアニオンに幅広い選択肢があり、どのような観点で選択すれば良いか、というクライテリアが確立されていない。本研究で得られた知見は、アニオンの鎖長が充放電反応において、可逆性に大きな影響を与える因子であることを明らかにするものであり、新たな蓄電池反応として期待されているアニオンGICの性能向上につながる成果である。
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