Preparation and evaluation of unusual ion-conductive properties of CO2/epoxide copolymer-based electrolytes

2015 Fiscal Year Final Research Report

• Project/Area Number: 25288095
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Polymer/Textile materials
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: Tominaga Yoichi 東京農工大学, 工学(系)研究科(研究院), 准教授 (30323786)
• Co-Investigator(Kenkyū-buntansha): NAKANO Koji 東京農工大学, 大学院工学研究院, 准教授 (70345099)
• Co-Investigator(Renkei-kenkyūsha): NAKAMURA Nobufumi 東京農工大学, 大学院工学研究院, 教授 (60313293)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 固体高分子電解質 / ポリカーボネート型電解質 / 二酸化炭素/エポキシド共重合体 / リチウムイオン二次電池 / ポリマーバッテリー / イオン伝導度 / リチウムイオン輸率

Outline of Final Research Achievements

In this study, we aimed to obtain solid polymer electrolytes at the achievement of excellent ion-conductive properties using CO2/epoxide copolymers. Increase in the unusual ionic conduction in poly(ethylene carbonate)-based electrolytes at very high salt concentrations may give rise to the increase in the segmental motion (α relaxation) of polymer chains from aggregated ions which are not related to the relaxation, and enhanced segments may move faster with these ionic moieties. Moreover, the copolymerization of EC/EO with 30 % of EO was successfully carried out, and the copolymer electrolyte with LiTFSI showed better properties as SPE compared with each corresponding homopolymer, PEC and PEO. The EC/EO copolymers showed great Li-ion transference numbers more than 0.7, and we evaluated these battery performance.

Free Research Field

高分子機能材料、イオン伝導材料、固体電解質、電池