Accession Number:

ADA193766

Title:

Polymeric Electrolytes.

Descriptive Note:

Technical rept.,

Corporate Author:

NORTHWESTERN UNIV EVANSTON IL MATERIALS RESEARCH CENTER

Report Date:

1987-01-01

Pagination or Media Count:

23.0

Abstract:

Research on solvent-free polymer electrolytes is currently very active, because of their potential applications in high energy density batteries, specific ion sensors, electrochromic displays, and other electrochemical devices. Pure ionic and mixed ionic-electronic conducting polymer-salt complexes will be discussed in this report. Vibrational spectroscopy, X-ray diffraction and EXAFS spectroscopy studies have provided structural information on PEO-salt complexes. For the sodium and lithium complexes, the cations are coordinated to the polyether oxygen atoms, and these cations reside within the helical tunnel of the PEO which is in a T2GT2G conformation. This proposed structure is comparable to the complexes formed between alkali metal salts and crown ethers. The formation of PEO-salt complexes, as in Equation 1, can be understood in terms of a balance between the lattice energy of the salt and the coordination energy of the cation by the polymer. In general, salts with large mononegative anions favor complex formation because of their low lattice energies.

Subject Categories:

  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE