Updated on 2025/11/30

写真a

 
ISHIGAMI, Kohei
 
Affiliation
Faculty of Science and Engineering, School of Advanced Science and Engineering
Job title
Research Associate

Research Experience

  • 2025.09
    -
    2025.10

    IMDEA Energy Institute   Unit of Electrochemical Processes   Visiting Researcher

Education Background

  • 2025.04
    -
    Now

    Waseda University   Graduate School of Advanced Science and Engineering   Department of Applied Chemistry  

    Doctoral Course

  • 2023.04
    -
    2025.03

    Waseda University   Graduate School of Advanced Science and Engineering   Department of Applied Chemistry  

    Master's course

  • 2019.04
    -
    2023.03

    Waseda University   School of Advanced Science and Engineering   Department of Applied Chemistry  

Professional Memberships

  • 2024.01
    -
    Now

    The Society of Polymer Science, Japan

  • 2022.11
    -
    Now

    The Chemical Society of Japan

Research Interests

  • Polymeric Active Materials

  • Organic Redox Flow Batteries

Awards

  • 第15回CSJ化学フェスタ2025 優秀ポスター賞

    2025.11  

  • 第73回高分子学会年次大会 優秀ポスター賞

    2024.07  

  • 7th Organic Battery Days 2024 Best Poster Award

    2024.06  

 

Papers

  • Approach to Tuning the Dispersion Stability of TEMPO‐substituted Polymer Nanoparticles for Aqueous Organic Redox Flow Batteries

    Kohei Ishigami, Shinjiro Mori, Kenichi Oyaizu

    ChemSusChem   18 ( 18 )  2025.08  [Refereed]

    Authorship:Lead author

     View Summary

    Hydrophilic redox polymer nanoparticles with zwitterionic moieties are synthesized to improve material utilization for semisolid redox flow batteries (RFBs). TEMPO is chosen as the charge storage moiety, taking advantage of its high redox‐activity in pH‐neutral aqueous electrolytes. Redox‐active polymer nanoparticles copolymerized with the zwitterionic moiety show significant changes in surface properties, indicating promising dispersion stability and electrochemical performance even at more than 1 mol% zwitterionic moiety in the copolymer in prototype semisolid RFBs. Among the compositions studied, the introduction of 10 mol% zwitterionic moiety results in the best combination of material utilization and cycle stability. This approach is an effective molecular design strategy to achieve high performance and high volumetric density semisolid RFBs.

    DOI

  • Combining low viscosity and high volumetric redox density of organic polymers for energy-efficient catholytes in redox flow batteries: a redox-active polyelectrolyte approach

    Kohei Ishigami, Kenichi Oyaizu

    Journal of Materials Chemistry A    2025  [Refereed]

    Authorship:Lead author

     View Summary

    <jats:p>Redox flow batteries, which combine polymeric active materials, nanoporous separators, and pH-neutral aqueous electrolytes, have the potential as low-cost, safe, grid-scale rechargeable batteries. Polymeric active materials that exhibit both high...</jats:p>

    DOI

Presentations

  • 有機レドックスフロー電池の活物質に適用するポリマーナノ粒子の表面特性制御

    石神航平, 森伸二郎, 小柳津研一

    第15回CSJ化学フェスタ2025 

    Presentation date: 2025.10

    Event date:
    2025.10
     
     
  • Synthesis of TEMPO-Substituted Polymers with Ammonium Pendant Group and Their Application to Aqueous Redox Flow Batteries

    Kohei Ishigami, Kenichi Oyaizu

    7th Organic Battery Days 2024 

    Presentation date: 2024.06

    Event date:
    2024.06
     
     
  • 溶解度とエネルギー密度を両立したポリマー活物質の合成とレドックスフロー電池への適用

    石神航平, 小柳津研一

    第73回高分子学会年次大会 

    Presentation date: 2024.06

    Event date:
    2024.06
     
     
  • レドックス活性高分子電解質溶液の粘性と微粒子分散性の動的制御

    小柳津研一, 石神航平, 森伸二郎

    第74回高分子討論会 

    Presentation date: 2025.09

    Event date:
    2025.09
     
     
  • Synthesis of TEMPO-substituted Polyelectrolytes and Characterization of Intrinsic Viscosity for Aqueous Organic Redox Flow Batteries

    Kohei Ishigami, Kenichi Oyaizu

    19th Pacific Polymer Conference 

    Presentation date: 2025.07

    Event date:
    2025.07
     
     
  • レドックスフロー電池に適用する水溶性高分子活物質の分子構造と電気化学特性

    石神航平, 小柳津研一

    第74回高分子学会年次大会 

    Presentation date: 2025.05

    Event date:
    2025.05
     
     
  • Viscosity Response to Redox Reaction in Water-Soluble TEMPO-Substituted Polyacrylamide for Aqueous Redox Flow Batteries

    Kohei Ishigami, Kenichi Oyaizu

    8th Organic Battery Days 2025 

    Presentation date: 2025.04

    Event date:
    2025.04
     
     
  • 水溶性TEMPO置換ポリマーの粘度挙動解析とレドックスフロー電池への適用

    石神航平, 小柳津研一

    日本化学会 第105春季年会 

    Presentation date: 2025.03

    Event date:
    2025.03
     
     
  • 膨潤性および分散安定性の向上を志向したレドックスフロー電池用ポリマーナノ粒子の合成と充放電特性

    森伸二郎, 石神航平, 小柳津研一

    日本化学会 第105春季年会 

    Presentation date: 2025.03

    Event date:
    2025.03
     
     
  • 高水溶性レドックス活性高分子電解質の有機レドックスフロー電池への適用

    石神航平, 小柳津研一

    関東高分子若手研究会 学生発表会・交流会2025 

    Presentation date: 2025.03

    Event date:
    2025.03
     
     
  • 粘度挙動を制御可能なレドックス活性ポリ電解質のレドックスフロ ー電池への適用

    石神航平, 小柳津研一  [Invited]

    第33回ポリマー材料フォーラム 

    Presentation date: 2024.11

    Event date:
    2024.11
     
     
  • Highly Water-Soluble TEMPO-Substituted Polymers for Operation of Aqueous Redox Flow Batteries with Nanoporous Membrane Separator

    The 4th International Symposium on Design & Engineering by Joint Inverse Innovation for Materials Arichitecutere 

    Presentation date: 2024.10

    Event date:
    2024.10
     
     
  • High Energy Density TEMPO-Substituted Polymers with Strongly Hydrophilic Structures for Aqueous Redox Flow Batteries

    Kohei Ishigami, Kenichi Oyaizu

    13th Jilin-Korea-Waseda Alliance Annual Symposium 

    Presentation date: 2024.08

    Event date:
    2024.08
     
     
  • 高いレドックス容量と溶解度を両立したTEMPO置換ポリマーの合成と水系レドックスフロー電池への適用

    石神航平, 五十嵐優翔, 小柳津研一

    関東高分子若手研究会 学生発表会・交流会2024 

    Presentation date: 2024.03

    Event date:
    2024.03
     
     
  • 有機レドックスフロー電池用ポリマー活物質における溶解性とエネルギー密度の両立した分子設計

    石神航平, 五十嵐優翔, 小柳津研一

    第16回超分子若手懇談会 

    Presentation date: 2024.01

    Event date:
    2024.01
     
     
  • TEMPO置換ポリエーテルの酸化状態の制御と対アニオンの伝導特性

    石神航平, 五十嵐優翔, 小柳津研一

    第13回CSJ化学フェスタ2023 

    Presentation date: 2023.10

    Event date:
    2023.10
     
     
  • Oxidation State Dependent Ionic Conductivity Profile in TEMPO-Substituted Polyethers as Solid Polymer Electrolytes

    Kohei Ishigami, Yuto Igarashi, Kenichi Oyaizu

    12th Jilin-Korea-Waseda Alliance Annual Symposium 

    Presentation date: 2023.08

    Event date:
    2023.08
     
     
  • 酸化状態を制御したTEMPO置換ポリエーテルの合成と固体電解質としての特性

    石神航平, 五十嵐優翔, 畠山歓, 小柳津研一

    日本化学会 第103春季年会 

    Presentation date: 2023.03

    Event date:
    2023.03
     
     

▼display all

 

Teaching Experience

  • 有機化学基礎実験

    2025.10
    -
    2026.01
     

  • 理工学基礎実験2B

    2025.10
    -
    2026.01
     

  • 理工学基礎実験1A

    2025.04
    -
    2025.07