Solid state ionic behavior of liquid electrolytes immobilized in a microporous membrane

• Published in: Solid state ionics 1990-08, Vol.40, p.620-623
• Main Authors: Itoh, T., Koseki, K., Mukaida, K., Kohno, K., Cao, Q.J., Yamamoto, O.
• Format: Article
• Language: English
• Subjects: Chemistry; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/0167-2738(90)90082-3

A novel class of membraneous electrolyte has been prepared by incorporating a complex of liquid polyethers and LiClO 4 in a microporous membrane. Surface tension and contact angle measurements suggested that numbers of polymer electrolyte solutions can be immobilized in pores of a microporous membrane by taking advantage of capillary condensation force. Polyethers such as PEO, PPO, and PEO/PPO copolymers having an average MW from 240 to 340 were complexed with LiClO 4 and immobilized in pores of a polyethylene membrane with a thickness of 4 to 10 μm and a pore radius of about 0.01 μm. Ionic conductivity of the immobilized liquid membrane electrolytes reached to the order of 10 −4 S cm −1 and the effective resistance approached to 1 Ω cm 2 at room temperature. The conductivity data suggested that the immobilized liquid membrane electrolytes behaved as liquids in the ion transport.