Effect of Ligand Substitution on Electrochemical Properties of Prussian Blue Analogues for Potassium Ion Batteries

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K20561
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0502:Inorganic/coordination chemistry, analytical chemistry, inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: Tokyo University of Science
• Principal Investigator: Hosaka Tomooki 東京理科大学, 研究推進機構総合研究院, 助教 (00907397)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Keywords: 二次電池 / カリウムイオン電池 / プルシアンブルー類似体 / 配位子

Outline of Final Research Achievements

This study shows that the electrochemical properties of PBA can be tuned by replacing the coordinating water in Prussian blue analogues (PBA) with different ligands. The halide ions were successfully introduced by synthesizing PBA in a solution containing a large amount of halide ions. However, since the composition of the synthesis solution has a great influence on the amount of lattice vacancies in PBA, it was found that the compatibility between the introduction of ligands and the control of the amount of lattice defects is a challenge. Finally, we revealed the possibility of controlling the electrochemical properties of PBA and achieving high energy density by optimizing the synthesis conditions.

Free Research Field

電気化学

Academic Significance and Societal Importance of the Research Achievements

持続可能なエネルギー社会の実現に向けて、資源が豊富な元素で構成されるカリウムイオン電池 (KIB) の開発が進められている。本研究で着眼するプルシアンブルー類似体 (PBA) はカリウムイオンを可逆的に脱挿入可能な3次元構造を持つため、KIB用正極材料として期待されている。
本研究では、PBAへの配位子導入によりPBAの電気化学特性の制御が可能であり、適切な種類および量の配位子を導入することでPBA高エネルギー密度化が実現可能であることが示唆された。