Development of Mix Conduction Organic Materials with Fast Ion Conductivity and Elucidation of The Conduction Mechanism

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K15396
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 28030:Nanomaterials-related
• Research Institution: Nagano Prefectural Institute of Technology (2023); Tsuruoka National College of Technology (2019-2022)
• Principal Investigator: Shomura Ryo 長野県工科短期大学校, 情報エレクトロニクス学科, 准教授 (50757599)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: 電子伝導 / イオン伝導 / 混合伝導 / ナノカーボン / イオン液体 / 二次電池

Outline of Final Research Achievements

In this study, we combined electron conductive materials such as nanocarbon materials with ion conductive materials such as ionic liquids to create a "new mixed-conducting organic material" that simultaneously exhibits electronic and ionic conductivity. And we then investigated its application to Li anode secondary battery materials. That material was applied to a Li anode as a coating material, and repeated Li dissolution/precipitation reactions were tested using a Li-Li cell. As a result, compared to the control, the increase in overpotential associated with an increase in Li dissolution/precipitation cycles was suppressed, suggesting long-term stability. It is speculated that this is the result of the coating inhibiting the decomposition of the electrolyte at the electrode interface and suppressing the adsorption of an insulated film.

Free Research Field

材料化学

Academic Significance and Societal Importance of the Research Achievements

現行のリチウムイオン電池の性能を凌駕する次世代二次電池に対する期待は大きく、2030年カーボンニュートラルに向けた取り組みにおいても、安全かつ大量に電気を貯めることができる高性能な二次電池の開発が期待されている。このような背景の元、本研究で得られた成果は、次世代二次電池の一つとして期待されているLi負極二次電池における「安全性向上」と「高寿命化」に資するものであり、産業的な観点から見ても波及効果が大きい。