Development of crystal-oriented ceramics with high ionic conductivity by reactive diffusion and ion exchange at the heterophase interface

2019 Fiscal Year Final Research Report

• Project/Area Number: 16H02396
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Inorganic materials/Physical properties
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: Koichiro Fukuda 名古屋工業大学, 工学(系)研究科(研究院), 教授 (90189944)
• Co-Investigator(Kenkyū-buntansha): 浅香 透 名古屋工業大学, 工学(系)研究科(研究院), 准教授 (80525973)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Keywords: イオン伝導体 / セラミックス / 構造・機能材料 / 環境材料

Outline of Final Research Achievements

Ceramics (polycrystalline materials made from inorganic materials) exhibit electrical properties such as ionic conductivity at high temperatures, in addition to superior physical properties. In ordinary ceramics, the crystalline particles are assembled in random orientations, and the physical and electrical properties of the individual crystalline particles are averaged throughout. When we fabricate polycrystals in which each particle is aligned in one direction, we can expect a remarkable improvement in performance by maximizing the properties of each particle. The researchers prepared crystal-oriented ceramics with high ionic conductivity from two different compounds by heating diffusion couples in air (reactive diffusion method). In addition, a novel crystal-oriented polycrystalline material with lithium-ion conductivity was successfully prepared by combining it with a cation exchange method.

Free Research Field

無機結晶化学

Academic Significance and Societal Importance of the Research Achievements

本研究では、特殊な装置や複雑なプロセスが不要であり、拡散対を加熱するだけの極めて簡便な「反応拡散法」を気相―固相系や液相―固相系へ拡張して汎用性を高め、さらに周知技術の「イオン交換法」と組み合わせることで、従来の結晶配向セラミックスの作製方法では実現不可能であったこのイオン伝導性の高配向セラミックスの作製に成功した。この研究成果は新しい固体酸化物形燃料電池や全固体二次電池の電解質の開発に繋がるものであり、緊々の課題であるエネルギー・環境問題の解決への貢献が期待される。