Dependence of inhomogeneous cathode reaction on charge/discharge conditions

• Project/Area Number: 18K05305
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Ritsumeikan University
• Principal Investigator: Katayama Misaki 立命館大学, 総合科学技術研究機構, 准教授 (90469198)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: イメージングXAFS / 放射光 / リチウムイオン電池 / 反応分布 / 温度 / 充放電レート / 電解液濃度 / 温度依存性 / レート依存性 / 積層型リチウムイオン電池 / 充放電環境

Outline of Final Research Achievements

In this study, we clarified how the reaction distribution is affected by conditions during charging and discharging. The chemical state maps demonstrated that higher discharge rate and higher temperature promoted the inhomogeneous reaction. Further, it was clarified the limited ionic diffusion affected the in-plane inhomogeneous reaction at room temperature and lower electrolyte concentrations.

Academic Significance and Societal Importance of the Research Achievements

リチウムイオン電池は広く利用されているが、有機電解液を含むため発熱・発火などの問題があり、安全性を向上させるためには様々なアプローチでの研究が必要がある。本研究では不均一な電極反応に注目し、環境・条件により不均一な反応分布がどのように変化するかを詳細に解析した。電池の性能低下や事故の要因の一つと考えられる不均一な電極反応について、理解を一歩進めることができた。

Research Products

• [Journal Article] Discharge condition dependence of in-plane inhomogeneous cathode reaction analyzed by X-ray absorption near edge structure imaging (2021)
  • Author(s): Katayama Misaki、Nishikawa Takuto、Yamagishi Hirona、Yasuda Shogo、Sano Tomoya、Kameyama Takashi、Orikasa Yuki、Inada Yasuhiro
  • Journal Title: Journal of Power Sources Volume: 506 Pages: 230256-230256
  • DOI: 10.1016/j.jpowsour.2021.230256
  • Peer Reviewed
• [Presentation] 二次電池正極の不均一な反応分布に関するイメージング XAFS 法による定量化 (2021)
  • Author(s): 西川琢斗, 片山真祥, 折笠有基, 稲田康宏
  • Organizer: 第81回分析化学討論会
• [Presentation] リチウムイオン電池正極反応分布の充放電条件依存性 (2021)
  • Author(s): 片山真祥, 西川琢斗, 折笠有基, 稲田康宏
  • Organizer: 2020年度量子ビームサイエンスフェスタ
• [Presentation] Analysis of Rate and Temperature Dependence of Inhomogeneous Cathode Reaction By Means of In-Situ XAFS Imaging (2020)
  • Author(s): Misaki Katayama, Hirona Yamagishi, Yuki Orikasa, and Yasuhiro Inada
  • Organizer: PRiME 2020
  • Int'l Joint Research
• [Presentation] Analysis of Irreversible Charge-Discharge Reaction in LiFePO4/Li4Ti5O12 Full-Cell Using Two-Phase Reaction Active Material (2020)
  • Author(s): Yuki Omote, Misaki Katayama, and Yuki Orikasa
  • Organizer: PRiME 2020
  • Int'l Joint Research
• [Presentation] Imaging XAFS Study on Reaction Distribution of Composite Electrode Used As Commercial Lithium-Ion Battery (2020)
  • Author(s): Mayu Morimoto , Misaki Katayama, and Yuki Orikasa
  • Organizer: PRiME 2020
  • Int'l Joint Research
• [Presentation] イメージングXAFSによる積層型リチウムイオン電池の反応分布解析 (2019)
  • Author(s): 片山真祥, 山岸弘奈, 折笠有基, 稲田康宏
  • Organizer: 第22回XAFS討論会
• [Presentation] Li4Ti5O12/LiFePO4フルセルにおける充放電反応不可逆性の解析 (2019)
  • Author(s): 表勇毅, 片山真祥, 稲田康宏, 折笠有基
  • Organizer: 第60回 電池討論会
• [Presentation] XAFS Imaging Study on Inhomogeneous Reaction of LiFePO4 Cathode (2018)
  • Author(s): Misaki Katayama, Tomoya Sano, Takashi Kameyama, Hirona Yamagishi, Yuki Orikasa, and Yasuhiro Inada
  • Organizer: The 19th International Meeting on Lithium Batteries
  • Int'l Joint Research
• [Presentation] Surface Modification Conditions of LiFePO4 Particle by Carbon Nanotube Using Ni Catalyst for Performance Improvement of Lithium Ion Battery (2018)
  • Author(s): Tomohiro Ohsaki, Hirona Yamagishi, Yusaku Yamamoto, Shohei Yamashita, Misaki Katayama, and Yasuhiro Inada
  • Organizer: 17th International Conference on X-Ray Absorption Fine Structure
  • Int'l Joint Research
• [Presentation] 二次電池正極における不均一な反応の観察 (2018)
  • Author(s): 片山真祥
  • Organizer: X線顕微鏡による機能の可視化と多次元情報の活用
  • Invited
• [Presentation] イメージングXAFSによるリン酸鉄リチウム正極不均一反応の解析 (2018)
  • Author(s): 片山真祥, 大﨑友裕, 木村謙吾, 山岸弘奈, 折笠有基, 稲田康宏
  • Organizer: 第21回XAFS討論会
• [Remarks] 研究の紹介
  • URL: http://www.ritsumei.ac.jp/~katayama/