the structure and ionic conduction mechanism of self-organized layered double hydroxide gel

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05242
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: Noriyuki Sonoyama 名古屋工業大学, 工学(系)研究科(研究院), 准教授 (50272696)
• Co-Investigator(Kenkyū-buntansha): 山本 勝宏 名古屋工業大学, 工学(系)研究科(研究院), 准教授 (30314082)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: イオン導電体 / 層状複水酸化物 / ゲル

Outline of Final Research Achievements

The layered double hydroxide (LDH) gel can be easily prepared in a self-forming manner at room temperature and under air. X-ray diffraction and Raman measurements showed that the LDH gel is composed of LDH particles with the same crystal structure as LDH powder. Extended X-ray absorption fine structure measurements revealed that the gel is formed by interactions between LDH particles that involve the surrounding water. LDH gel also showed high ionic conductivity of up to 1.37×10-1 S/cm. This is thought to be due to the high speed movement of hydroxide ions through the network formed by water and LDH particles.

Free Research Field

電気化学

Academic Significance and Societal Importance of the Research Achievements

層状複水酸化物（LDH）は、非常に高い水酸化物イオン導電性を示す。そのため、LDHゲルは、リチウムイオン電池の約2倍のエネルギー密度を持つ亜鉛空気二次電池の電解質として用いることが期待される。しかし、リチウム空気二次電池の電解質への応用は現時点では困難であった。今後克服すべき課題として、LDHゲルの物理的強度の改良・界面形成の最適化・セルの構成・充放電時の条件など多くのことを調整する必要がある。