Polymeric Electrolytes.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1987
- Accession Number
- ADA193766
Entities
People
- C. S. Harris
- L. C. Hardy
- P. M. Blonsky
- R. Spindler
- S. Clancy
Organizations
- Northwestern University