• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study for electronic states of water in high-concentration aqueous electrolytes solutions to demonstrate potential window expansion of mechanism of aqueous electrolyte

Research Project

Project/Area Number 21K05013
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 32020:Functional solid state chemistry-related
Research InstitutionKindai University

Principal Investigator

Morisawa Yusuke  近畿大学, 理工学部, 准教授 (60510021)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords減衰全反射遠紫外分光法 / ハイドレートメルト / 水 / リチウム二次電池 / ナトリウム二次電池 / 水性電解質 / 遠紫外分光法 / 電気化学分光測定
Outline of Research at the Start

アメリカUMDのWangらによってLiTFSIの飽和水溶液における電位窓拡張が報告され、高濃度電解質水溶液がリチウムイオン二次電池用電解質として実現された。東大の山田らの2016年のハイドレートメルトの発表からさらに世界的に広がり、2020年度においても多くの論文発表がなされている。すでに多くの研究がなされている中、高濃度電解質中の水についての電子状態変化は理論的研究にとどまり、実験的研究はまだ公表されておらず、その実証を大型施設を用いないデスクトップ型のATR-FUV装置で実現することはその後の、研究室単位での分析が可能となり、分野のすそ野を広げるためのインパクトのある研究である。

Outline of Final Research Achievements

To elucidate the cause of the enhanced electrochemical stability of water in hydrate melts (HM), I used electrochemically attenuated total reflectance far-UV spectroscopy (EC-ATR-FUV) to demonstrate the changes in electronic states of water in highly concentrated salt aqueous solutions such as HM during voltage application, and elucidate the mechanism for improving physical properties such as electrochemical stability.
We found that it is effective to use far-ultraviolet spectra, and near-infrared spectra, which contain complementary information, to understand the solution structure of high-concentration solutions of Li and Na salts. When we performed measurements on the EC-ATR-FUV, which had a uniform thin aluminum film deposited on the surface of internal reflectance elements, we observed what appeared to be the electronic spectrum of the Solid Electrolyte Interphase (SEI) formed on the electrode surface.

Academic Significance and Societal Importance of the Research Achievements

ハイドレートメルトなど高濃度塩溶液に対し遠紫外スペクトル,電気化学的遠紫外スペクトルと近赤外スペクトルを用いて,非破壊で溶液構造や電極にできるSEIを分析できる可能性を見出した。これらは大型装置を用いないので各研究室レベルでの実験が可能である。分析方法を確立させることができればポストリチウムイオン電池への展開として、これまで錯体形成による電子状態変化が研究されていない他のアルカリ金属やアルカリ土類金属への研究さらには、フッ化物アニオン以外のアニオンへの展開を加速することができると考えられる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (13 results)

All 2024 2023 2022 2021

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results) Presentation (11 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Journal Article] ATR-far-ultraviolet spectroscopy: a challenge to new σ chemistry2024

    • Author(s)
      Ozaki Yukihiro、Morisawa Yusuke、Tanabe Ichiro
    • Journal Title

      Chemical Society Reviews

      Volume: 53 Issue: 4 Pages: 1730-1768

    • DOI

      10.1039/d3cs00437f

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Experimental verification of increased electronic excitation energy of water in hydrate-melt water by attenuated total reflection-far-ultraviolet spectroscopy2022

    • Author(s)
      Ueno Nami、Takegoshi Masato、Zaitceva Anna、Ozaki Yukihiro、Morisawa Yusuke
    • Journal Title

      The Journal of Chemical Physics

      Volume: 156 Issue: 7 Pages: 074705-074705

    • DOI

      10.1063/5.0071893

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 高濃度リチウムおよびナトリウム塩を用いた水系電解質における水の溶液構造と電子状態2024

    • Author(s)
      森澤 勇介、東 翔一、難波 綾乃、和氣 諒太郎
    • Organizer
      日本化学会第104春季年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Electronic states of water in “Water-in-Salts” and “Hydrate-melts” electrorytes.2023

    • Author(s)
      Yusuke Morisawa
    • Organizer
      SciX2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Investigating the Solution Structure of Hydrate Melt (HM) using NearInfrared Spectroscopy2023

    • Author(s)
      Shoichi Higashi, Yusuke Morisawa
    • Organizer
      SciX2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Attenuated total reflection far ultraviolet (ATR-FUV) spectroscopy of the ambient environment of water in highly concentrated alkali metal salt electrolytic solutions.2023

    • Author(s)
      Shoichi Higashi , Yusuke Morisawa1,
    • Organizer
      2023年度日本分光学会年次講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 減衰全反射遠紫外(ATR-FUV)分光法を用いた高濃度アルカリ金属塩電解水溶液中の水の周囲環境の解明2023

    • Author(s)
      東 翔一、森澤 勇介
    • Organizer
      日本分析化学会第72年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 遠紫外分光法で探る高濃度アルカリ金属塩電解質中の水の電子状態2023

    • Author(s)
      東 翔一,井谷 走麻,上野 那美,森澤 勇介
    • Organizer
      第17回分子科学討論会 2023大阪
    • Related Report
      2023 Annual Research Report
  • [Presentation] 倍音吸収からみたナトリウム高濃度電解塩水溶液の周囲環境2023

    • Author(s)
      東 翔一、森澤 勇介
    • Organizer
      第83回分析化学討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 高濃度リチウムおよびナトリウム塩水溶液における水の電子状態および水素結合状態2022

    • Author(s)
      森澤 勇介、上野 那美、山﨑 渓太、山口 礼央
    • Organizer
      第82回分析化学討論会
    • Related Report
      2022 Research-status Report
  • [Presentation] Investigation of the electronic states of water in hydrate-melt using attenuated total reflectance far-ultraviolet spectroscopy2021

    • Author(s)
      Yusuke Morisawa, Nami Ueno
    • Organizer
      SPIE Nanoscience + Engineering
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Study for electronic states of water in high-concentrated aqueous solutions of lithium salts2021

    • Author(s)
      Yusuke Morisawa, Nami Ueno
    • Organizer
      SciX2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Investigation for hydrogen bonding via electronic states using ATR-FUV2021

    • Author(s)
      Yusuke Morisawa
    • Organizer
      Pacifichem 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi