Stability in alkaline aqueous electrolyte of air electrode protected with fluorinated interpenetrating polymer network membrane

作者：Bertolotti Bruno; Messaoudi Houssam; Chikh Linda; Vancaeyzeele Cedric; Alfonsi Severine; Fichet Odile^*

来源：Journal of Power Sources, 2015, 274: 488-495.

DOI：10.1016/j.jpowsour.2014.10.059

• Interpenetrating polymer networks
• Anion exchange membrane
• Air electrode
• Fluorinated polymer
• Atmospheric air

We developed original anion exchange membranes to protect air electrodes operating in aqueous lithium-air battery configuration, i.e. supplied with atmospheric air and in concentrated aqueous lithium hydroxide. These protective membranes have an interpenetrating polymer network (IPN) architecture combining a hydrogenated cationic polyelectrolyte network based on poly(epichlorohydrin) (PECH) and a fluorinated neutral network based on perfluoropolyether (Fluoroline (R) MD700). Two phases, each one rich in one of the polymer, are co-continuous in the materials. This morphology allows combining their properties according to the weight proportions of each polymer. Thus, PECH/Fluorolink IPNs show ionic conductivity varying from 1 to 2 mS cm(-1), water uptake from 30 to 90 wt.% and anionic transport number from 0.65 to 0.80 when the PECH proportion varies from 40 to 90 wt.%. These membranes have been systematically assembled on air electrodes. Air electrode protected with PECH/Fluorolink 70/30 IPN shows outstanding stability higher than 1000 h, i.e. a 20-fold increase in the lifetime of the non-modified electrode. This efficient membrane/air electrode assembly is promising for development of alkaline electrolyte based storage or production energy systems, such as metal air batteries or alkaline fuel cells.

• 出版日期2015-1-15