Lithium ion conductors and proton conductors: Effects of plasticizers and hydration

✍ Scribed by Caroline S. Harris; Thomas G. Rukavina

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 598 KB
• Volume: 40
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(95)00185-h

✦ Synopsis

Lithium ion conductors and proton conductors were developed in support of a large-area electrochromic transparency effort with the goal of identifying a polymer electrolyte that provides high ionic conductivity with good electrochemical and thermal stability. The best lithium ion conductor was found to be a transparent, solid uv-curable poly(alkyleneoxy)acrylate-LiCF,SO, complex that has excellent thermal stability, and room temperature ionic conductivity on the order of 10m6 Scm-'. The addition of 50wt.% propylene carbonate to the polymer-salt complex increases its conductivity by three orders of magnitude, without degradation of its other physical properties. Two sulfonic acid-based polyelectrolytes were explored as potential proton conductors, a cross-linked poly(2-acrylamido-2-methyl-lpropane sulfonic acid), PAAMPS, which has practical use for temperatures up to about 7O"C, and a novel vinyl sulfonic acid/vinylpyrrolidone copolymer that has excellent thermal stability for over 1000 h at 90°C. The copolymer has the potential for high conductivity based on its relatively low equivalent weight. Two different electrochromic devices containing the polymer electrolytes are described, and the temperature-dependent switching behavior of the devices is related to the conductivity of the polymer electrolytes.