Functional advancement of complex hydrides as solid-state ionic conductor by structural optimization

• Project/Area Number: 16H04513
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Kwansei Gakuin University
• Principal Investigator: Matsuo Motoaki 関西学院大学, 理工学部, 准教授 (20509038)
• Research Collaborator: Orimo Shin-ichi
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000); Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2016: ¥14,170,000 (Direct Cost: ¥10,900,000、Indirect Cost: ¥3,270,000)
• Keywords: 錯体水素化物 / イオン伝導 / 水素化物 / ナトリウムイオン伝導

Outline of Final Research Achievements

Hydro-closo-borates composed of the [B12H12]2－ closo-borate anions exhibit superionic conductivities on the order of 0.1 S/cm after the order-disorder transitions. From the application point of view, it is highly desirable to enhance the conductivities at room temperature. In this study, we have found out combining [B12H12]2－ with [NH2]- and partial dehydrogenation are effective in modifying the conductivities of hydro-closo-borates. Na2B12H12 + NaNH2 shows the highest sodium ionic conductivity of 1×10(-6) S/cm at room temperature in this system. In the case of Na2B10H10, the conductivity is also increased to 3×10(-5) S/cm when mixed with NaNH2 at molar ratio of 3:1. Moreover, the conductivity of Li2B12H12 increases to 2×10(-5) S/cm from 6×10(-7) S/cm by partial dehydrogenation.

Academic Significance and Societal Importance of the Research Achievements

クロソ系錯体水素化物の相転移温度以下でのイオン伝導率を改善するという目標を達成することができた。その中でも部分脱水素化量制御によるアプローチは、水素化物特有のものであり、国内外の他のグループに先行して本研究で初めて着眼した材料設計指針である。今後錯体水素化物での高速イオン伝導機能を飛躍的に発展させ高エネルギー密度の全固体二次電池の実現を後押するとともに、“水素化物でのイオニクス”分野の学理探求に貢献する成果と言える。

Research Products

• [Journal Article] Fast sodium ionic conduction in Na2B10H10-Na2B12H12 pseudo-binary complex hydride and application to a bulk-type all-solid-state battery (2017)
  • Author(s): K. Yoshida, T. Sato, A. Unemoto, M. Matsuo, T. Ikeshoji, T.J. Udovic, S. Orimo
  • Journal Title: Applied Physics Letters Volume: 110 Issue: 10
  • DOI: 10.1063/1.4977885
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Development of complex hydrides for fast ionic conduction (2019)
  • Author(s): M. Matsuo, N. Matsubara, N. Katayama, H. Asano, K. Sawada, S. Orimo
  • Organizer: Nonstoichiometric Compounds VII
  • Int'l Joint Research
• [Presentation] Development of complex hydrides for fast ionic conduction (2018)
  • Author(s): N. Matsubara, N. Katayama, S. Orimo, M. Matsuo
  • Organizer: The 2nd International Symposium on Fuels and Energy
  • Int'l Joint Research
• [Presentation] closo型錯イオン[BnHn]2-を有する錯体水素化物での高速イオン伝導 (2018)
  • Author(s): 麻野 隼, 澤田 健吾, 松原 徳宏, 折茂 慎一, 松尾 元彰
  • Organizer: 第163回日本金属学会講演大会
• [Presentation] クロソ型錯イオンを有する錯体水素化物での高速イオン伝導 (2018)
  • Author(s): 片山 昇, 松原 徳宏, 松尾 元彰
  • Organizer: 第 13 回水素若手研究