Phase relations and conductivity in the system poly(ethylene oxide)LiClO4

✍ Scribed by P.W.M. Jacobs; J.W. Lorimer; A. Russer; M. Wasiucionek

• Book ID: 103898477
• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 538 KB
• Volume: 26
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(89)80170-3

✦ Synopsis

DSC, DTA, TGA, X-ray, and conductivity carried out on mixtures of purified poly(ethylene measurements have been oxide) (PEO) and lithium perchlorate and the phase diagram of the system PEO + LiC104 has been determined. The mixtures showed pronounced thermal decomposition beginning at 100 -150 "C (depending on LiC104 content) so that phase equilibria could not be determined above the decomposition temperature. The phase diagram indicates the presence of three compounds containing, respectively, one, two, and three Li ions per -CH&H@--repeating unit. Glass transition temperatures Tg increased with increasing lithium content from 213 K for pure PEO to 269 K at n = 2. Conductivities went through maxima at IZ = 12 reaching 2.5 X 10F3 S cm-i at 373 K. The temperature dependence of conductivity could be represented by the Vogel-Tammann-Fulcher (VTF) equation over the whole temperature range in which the mixtures are amorphous, 298 -393 K (n = 4, 8), above 313 K (n = 12) or above 323 K (n = 16).