Elucidation of ionic correlation in superionic conductors using single crystals

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04636
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Nagoya University (2023); The University of Tokyo (2021-2022)
• Principal Investigator: YAJIMA Takeshi 名古屋大学, 工学研究科, 准教授 (10597800)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 超イオン伝導体 / 単結晶

Outline of Final Research Achievements

To better understand the relationship between ion correlation and ion conduction in superionic conductors, we tried to grow single crystals of Li10GeP2S12 (LGPS) with elemental substitution and measured the ionic conductivity of Li1+xAlxTi2-x(PO4)3 (LATP) single crystals. The results indicated that the impact of ionic correlation in LATP is the opposite of that in LGPS, implying that the effect of ionic correlation on ion conduction may differ with the density of Li atoms in the crystal structure.

Free Research Field

固体化学

Academic Significance and Societal Importance of the Research Achievements

本研究により、近年着目されているイオン同士の相関がイオン伝導に与える影響が物質によって異なり、結晶構造中のLiイオン濃度が重要である可能性が示された。超イオン伝導体は全固体電池の固体電解質として用いられ、そのイオン伝導率向上が必要不可欠である。本研究の成果は、そのイオン伝導率向上に向けた新たな物質設計指針の確立につながるものである。