Room-temperature magnesium ion diffusion using ordered structure in molecular crystals and its application to solid electrolytes

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K21079
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: Shizuoka University
• Principal Investigator: Moriya Makoto 静岡大学, 理学部, 准教授 (70452208)
• Project Period (FY): 2020-07-30 – 2023-03-31
• Keywords: 固体電解質 / 分子結晶 / マグネシウム / イオン伝導 / 結晶構造

Outline of Final Research Achievements

We investigated the synthesis of novel molecular crystalline electrolytes with Mg-ion conduction paths to develop Mg ion-conductive solid electrolytes. In this study, we employed Mg{N(SO2CF3)2}2 as a starting material, and the novel molecular crystalline electrolytes were obtained from the reactions with various organic molecules and ionic liquid analogs. The structure of the obtained molecular crystals was elucidated by a single-crystal X-ray diffraction study. The ionic conductivity and Mg ion transference numbers of the molecular crystals in the solid state were evaluated by electrochemical measurements. The relationship between the crystal structures of the obtained molecular crystalline electrolytes and the Mg ionic conductivity properties was carefully investigated, and the fundamental information for the material design guideline toward the high Mg ionic conductive molecular crystals was obtained.

Free Research Field

材料科学

Academic Significance and Societal Importance of the Research Achievements

Mgイオン伝導性固体電解質が大きな注目を集めているが、二価カチオンであるMgイオンはアニオン部位と強固な相互作用を形成するため、固体中での高速拡散は容易ではなかった。一方、本研究では、室温下でMgイオン伝導性を示す新規分子結晶電解質を複数得るとともに、それらの詳細な結晶構造を明らかにすることに成功した。これは、Mgイオン伝導性固体電解質の新たな探索領域として、分子結晶に大きな可能性があることを示すとともに、全固体Mg電池の開発に新たな方向性を示す結果として、学術的にも産業的にも意義の大きな研究成果といえる。