Polymer electrolytes based on unsaturated ethylene oxide-segmented polymers
Polymer electrolytes were prepared from LiClO{sub 4} and high molecular weight unsaturated ethylene oxide-segmented polymers with the generic formula {minus}[(CH{sub 2}){sub x}CH{double{underscore}bond}CH(CH{sub 2}){sub x}O(CH{sub 2}CH{sub 2}O){sub y}]{sub n}--([C{sub x}{pi}C{sub x}EO{sub y}]{sub n}). Synthesized by metathesis polymerization of {alpha}, {omega}-dienes that contain oligomeric poly(ethylene oxide) cores, these polymers are tacky, adhere well to glass and metal surfaces, and have glass transition temperatures between {minus}70 and {minus}80 C. Polymers that contain relatively long alkyl or polyether segments are crystalline below room temperature, but adding LiClO{sub 4} to the polymers converts them to amorphous polymer electrolytes with room-temperature conductivities (20 C) of {approx}2 x 10{sup {minus}5} S/cm. The T{sub g}s of the materials can be fit by a simple model based on the Fox equation, and an analysis of the results indicates that the Li{sup +}:monomer repeat unit stoichiometry is 1:1 for polymers with long block lengths, and decreases to 1:2 for polymers with poly(ethylene oxide) segments with less than 4 repeat units.
- Research Organization:
- Michigan State Univ., East Lansing, MI (US)
- OSTI ID:
- 20001175
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 9 Vol. 11; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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