2022 Fiscal Year Final Research Report

Development of high-performance, safe and low-cost solid energy-storage capacitors

Research Project

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Project/Area Number	20K20439
Project/Area Number (Other)	19H05515 (2019)
Research Category	Grant-in-Aid for Challenging Research (Pioneering)
Allocation Type	Multi-year Fund (2020) Single-year Grants (2019)
Review Section	Medium-sized Section 26:Materials engineering and related fields
Research Institution	Tokyo Institute of Technology
Principal Investigator	Tsurumi Takaaki 東京工業大学, 物質理工学院, 教授 (70188647)
Co-Investigator(Kenkyū-buntansha)	保科拓也東京工業大学, 物質理工学院, 准教授 (80509399) 安原颯東京工業大学, 物質理工学院, 助教 (20880032)
Project Period (FY)	2019-06-28 – 2023-03-31
Keywords	固体イオンキャパシタ / 蓄電 / 固体電解質 / エネルギー密度
Outline of Final Research Achievements	This research was carried out with the aim of creating a new energy storage capacitors that are safe without degradation. The developed capacitor is an electric double layer capacitor that uses a solid electrolyte. By introducing a special nanostructure into the electrolyte, it is possible to apply a high voltage and improve the energy density. In order to experimentally verify the principle of this HV Solid Ionic Capacitor, Li-type and Na-type samples were prepared and their charge-discharge characteristics were measured. As a result, it was confirmed that the energy density was improved by high-voltage driving by introducing nanostructures. Furthermore, when the energy density was calculated with respect to the size of the nanostructures, the introduction of nanostructures of about 300 nm resulted in performance exceeding that of lithium batteries.
Free Research Field	エネルギー材料
Academic Significance and Societal Importance of the Research Achievements	地球温暖化の抑制には優れた蓄電装置の開発が必須である。キャパシタは電気エネルギーを変換せず蓄えるので、劣化・発火の問題がない理想的な蓄電素子であるが、現状の電気二重層キャパシタは、液体電解質の電気分解のためエネルギー密度に上限がある。本研究で開発したHV固体イオンキャパシタは、特殊なナノ構造を導入した固体電解質を用いた電気二重層キャパシタである。ナノ構造により高電圧駆動が可能になりエネルギー密度が向上することが実験的に検証されている。エネルギー密度はナノ構造の微細化でさらに向上が可能である。このキャパシタは日本の素材産業でしか作れないので、実用化に成功すれば日本経済の復活に大きく貢献する。