Creation of high functional Li-air battery based on synergy effect of multi-catalysis

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K18835
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: Shibaura Institute of Technology
• Principal Investigator: ISHIZAKI Takahiro 芝浦工業大学, 工学部, 教授 (50397486)
• Project Period (FY): 2021-07-09 – 2024-03-31
• Keywords: i空気電池 / カーボン系材料 / 触媒 / 深共晶溶媒 / 酸素の酸化還元反応

Outline of Final Research Achievements

In this study, synthesis of heteroatom-doped carbon composite materials (HCC), metal oxide nanoparticles (MON), and composite materials composed of HCC and MON, were performed. In addition, deep eutectic solvents (DESs) having catalytic property for oxygen redox reaction were explored and the physicochemical properties of the DESs were investigated. Battery performance of Li-oxygen batteries (LOB) using the composite materials as cathode, lithium as anode, and the DESs as electrolyte was also investigated. DESs were prepared by mixing N-methylacetamide (NMA) and LiNO3 at constant rates. The battery performance of LOB using the DESs as electrolytes was evaluated. In this case, the overpotentials for discharge and charge was lower than the LOB using conventional electrolyte. The charge and discharge potentials were found to be 3.6 and 2.7 V, respectively, revealing that the DESs could lead to reduction in charge overpotentials.

Free Research Field

表面工学

Academic Significance and Societal Importance of the Research Achievements

異種元素ドープカーボン材料と酸化物ナノ粒子の複合材を合成したことにより、酸素の酸化還元反応の両面に対して触媒機能を発現できるようになった。これは、Li空気電池の実用化に向けて前進させる結果である。また、深共晶溶媒をLi空気電池の電解液として使用可能であること、また、深共晶溶媒が充電過電圧を低減できることを明らかにできたことは、Li空気電池の性能を向上させる上で、有意義な知見であると考えられる。