Creation of Nanosheet Materials based on Poly(carbon monosulfide)s having Conduction Ionically and Electronically as a Positive-Electrode Active Material for Lithium-Ion Secondary Battery

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05678
• 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: Tokyo City University
• Principal Investigator: KANAZAWA Akihiko 東京都市大学, 理工学部, 教授 (80272714)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 二硫化炭素 / ポリ硫化炭素 / ナノシート / 電子-イオン混合伝導性 / 正極活物質 / 硫黄正極 / リチウムイオン二次電池 / 全固体電池

Outline of Final Research Achievements

In this study, nanosheets based on organometallic complexes with π-conjugated poly(carbon monosulfide)s as a ligand, which are derived from carbon disulfides by electrochemical or photochemical techniques, were found to act as a single-phase material showing significant conduction ionically and electronically originated from the polycyclic π-electron system. The poly(carbon monosulfide)-based nanosheet materials have been presented to become a promising candidate as a new class of the positive-electrode active materials for lithium-ion secondary battery.

Free Research Field

高分子合成化学、機能材料化学

Academic Significance and Societal Importance of the Research Achievements

本研究で提案するポリ硫化炭素ナノシート材料は、硫黄と導電性高分子の両性質（酸化還元応答性、電子伝導性）をもつだけでなく、リチウムイオン伝導性も示すことが期待できる。本研究成果により、理論電気容量の点で最有力である硫黄正極が抱える低い化学的安定性、高抵抗（絶縁性）といった難題を克服でき、エネルギー密度および急速充電性に優れた将来世代の硫黄正極リチウムイオン二次電池の開発研究に波及すると予想される。