The development of organic active materials for secondary batteries that polymerize inside the positive electrode

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14696
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 35030:Organic functional materials-related
• Research Institution: Ehime University
• Principal Investigator: Yoshimura Aya 愛媛大学, 理工学研究科(工学系), 講師 (50772696)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 正極活物質 / 二次電池 / 有機材料 / 重合 / 高サイクル特性

Outline of Final Research Achievements

Lithium-ion batteries (LIBs) are widely used in energy storage and conversion. Organic molecules have emerged as promising alter-natives to inorganic materials. However, the short cycle life caused by the high solubility of organic electrolytes is a critical limitation. In this research, I focuced on redox-active molecules bearing polymerization sites. Tetrathiafulvalene derivatives bearing phenyl amine moeities were synthesized and the cell performance of a coin-type cell composed of a positive electrode incorporating synthesized molecules as the active material was evaluated. As a result, we confirmed that molecules with sufficient polymerization sites could show stable cycle life.

Free Research Field

有機機能性材料

Academic Significance and Societal Importance of the Research Achievements

酸化還元活性な有機化合物は有機二次電池の電極材料に利用できることから，多くの有機化学者および材料科学者がこの研究分野に参画している。しかしながら、未だ有機材料の溶解性の高さを改善し、高い容量、高いサイクル特性、高いエネルギー密度を同時に満たす有機分子の開発には至っていない。本研究によって得られた知見は、これらの性能を満たす有機正極活物質の創製に向けた新たな分子設計指針を提供するものであり、有機正極活物質の将来的な普及に向けて有益な研究成果が得られたと言える。