Improvement of lithium-ion conduction based on evolution of grain-boundary conduction upon ceramics fabrication

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K05020
• 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: National Institute for Materials Science
• Principal Investigator: MIYOSHI Shogo 国立研究開発法人物質・材料研究機構, エネルギー・環境材料研究拠点, 主任研究員 (30398094)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: リチウムイオン伝導 / 固体電解質 / 粒界抵抗 / NASICON型酸化物 / ペロブスカイト型酸化物 / ガーネット型酸化物

Outline of Final Research Achievements

Lithium-ion conducting oxides, which are expected as electrolyte materials for all-solid lithium ion batteries, typically suffers from severe electric resistance caused by grain boundaries. In this study, in order to understand the origin of grain-boundary resistance, we have investigated transition of grain-boudnary resistance upon sintering and densification. In addition, the mechanism of sinterability enhancement has been revealed, which enables us to suggest suitable agents for lowering sitnering temperature and obtaining ceramics with sufficient conductivity.

Free Research Field

固体化学

Academic Significance and Societal Importance of the Research Achievements

リチウムイオン伝導性酸化物セラミックスにおける粒子間の伝導性が熱処理により変化する様子を観測した結果から、清浄な粒子界面は伝導において不利である可能性が示唆された。また、共存する化合物の融解に起因する焼結促進現象のメカニズムを解明するとともに、これに基づいて焼結助剤を提案出来ることを示した。