Voltage-driven redistribution of lithium ions at solid electrolyte and electrode interfaces

• Project/Area Number: 16K14088
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic industrial materials
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Hitosugi Taro 東京工業大学, 物質理工学院, 教授 (90372416)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 固体電解質 / 電極 / 電気化学 / リチウム / 電圧印加 / 全固体電池 / 空間電荷層 / 界面抵抗 / リチウムイオン電池 / 無機工業化学 / 先端機能デバイス / セラミックス

Outline of Final Research Achievements

All-solid-state lithium batteries are expected as next-generation batteries due to the safety, high energy density, and high power. However, the high interface resistance at the solid electrolyte and positive electrode interfaces hinder the application of all-solid-state lithium battery in the market. Therefore, it is necessary to clarify the origin of the high interface resistance and the distribution of lithium ions near the interface.
Therefore, in this study, we investigated the lithium concentration distribution near the interface using Rutherford backscattering, nuclear reaction analysis, and neutron reflectivity measurement. We succeeded in the quantitative observation of the voltage-driven redistribution of lithium ions in solid electrolytes.

Research Products

• [Journal Article] A Nonvolatile Memory Device with Very Low Power Consumption Based on the Switching of a Standard Electrode Potential (2017)
  • Author(s): Issei Sugiyama, Ryota Shimizu, Tohru Suzuki, Kuniko Yamamoto, Hideyuki Kawasoko, Susumu Shiraki, and Taro Hitosugi
  • Journal Title: APL Materials Volume: 5 Issue: 4 Pages: 046105-046105
  • DOI: 10.1063/1.4980031
  • Peer Reviewed / Open Access
• [Presentation] 中性子反射率法を用いたLiCoO2正極/固体電解質界面におけるLi分布の解析 (2017)
  • Author(s): 小林 成, 杉山 一生, 清水 亮太, 花島 隆泰, 宮田 登, 武田 全康, 一杉 太郎
  • Organizer: 小林 成, 杉山 一生, 清水 亮太, 花島 隆泰, 宮田 登, 武田 全康, 一杉 太郎
  • Place of Presentation: 東京
  • Year and Date: 2017-03-25
• [Presentation] 小林 成, 杉山 一生, 清水 亮太, 花島 隆泰, 宮田 登, 武田 全康, 一杉 太郎 (2017)
  • Author(s): 中性子反射率測定によるLiCoO2正極/固体電解質界面のLi分布の解析
  • Organizer: 日本表面科学会第２回関東支部講演大会
• [Presentation] Neutron reflectometry studies of Li-ion distribution in LiCoO2 cathode/solid-electrolyte interfaces (2017)
  • Author(s): Shigeru Kobayashi, Issei Sugiyama, Ryota Shimizu, Takayasu Hanashima, Noboru Miyata, Masayasu Takeda, and Taro Hitosugi
  • Organizer: The 8th International Symposium on Surface Science
• [Presentation] 中性子反射率及び核応分析法による固体電解質中 Li 濃度分布の決定 (2016)
  • Author(s): 杉山 一生, 齋藤 正裕, 宮田 登, 花島 隆泰, 阿久津 和宏, 青木 靖仁, 大塚 祐二, 武田 全康, 清水 亮太, 一杉 太郎
  • Organizer: 第77回応用物理学会秋季学術講演会
  • Place of Presentation: 新潟
  • Year and Date: 2016-09-13
• [Remarks] 東京工業大学 一杉研究室ホームページ
  • URL: http://www.apc.titech.ac.jp/~thitosugi/index.html