Growth of High Lithium Ion Conductive Oxide Single Crystals with Controlled Composition and Orientation

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15377
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: University of Yamanashi
• Principal Investigator: Maruyama Yuki 山梨大学, 大学院総合研究部, 助教 (10782469)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 単結晶 / 結晶成長 / チタン酸ランタンリチウム / リチウムイオン伝導体 / 全固体リチウムイオン電池

Outline of Final Research Achievements

In this study, layered titanium lanthanum lithium La2/3-xLi3xTiO3 single crystals, which have a layered structure, were grown using the traveling solvent floating zone method. We investigated the correlation between Li composition in the crystal and ion conductivity by controlling the composition. At x = 0.059, the ion conductivity reached a maximum value of 1.75×10-3 S/cm, and as the Li concentration in the crystal increased, the ion conductivity decreased. We revealed that the ion conductivity anisotropy was σ[100]/σ[001] = 2.5.

Free Research Field

結晶工学、無機材料化学

Academic Significance and Societal Importance of the Research Achievements

本研究では、溶媒移動浮遊帯域溶融法により結晶組成と結晶方位を制御したLa2/3-xLi3xTiO3の単結晶を育成することに成功し、イオン伝導度のリチウム濃度依存性およびイオン伝導異方性を調べることで層面内の高いイオン伝導特性を明らかにした。本研究成果により、固体電解質単結晶基板への応用が期待でき、全固体リチウムイオン電池の開発に繋がる。