Development of electrolyte for high-voltage potassium secondary battery

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K15686
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Yoshii Kazuki 国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 主任研究員 (80735960)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 電解液 / カリウム電池 / イオン液体

Outline of Final Research Achievements

In the present study, the electrolyte for potassium secondary batteries with high voltage was investigated. Various electrolytes were investigated using a potassium-containing composite oxide as a cathode that exhibits an average voltage of 4 V. It was found that an ionic liquid consisting of pyrrolidinium cations could be a promising candidate for the electrolyte. It is also confirmed that the organic electrolyte with high salt concentration was favorable as the electrolyte. We also tried to find additives and develop ionic liquid-based electrolytes with high ionic conductivity.

Free Research Field

電気化学

Academic Significance and Societal Importance of the Research Achievements

カリウム二次電池は資源的な優位性などの点から次世代蓄電池として注目され、世界中で研究例が急増している。電池の構成要素である、正極材料、負極材料、電解液の中で、電解液に関する研究はそれほど多くない。本研究で得られた成果は、カリウム二次電池用電解液として有望な候補を示すことができたと考えており、学術的および社会的に意義のあるものであると考えられる。