IONIC-CONDUCTIVITY AND LI-7 NMR-STUDY OF SOLID POLYMER ELECTROLYTES BASED ON POLYETHERURETHANE COPOLYMER NETWORKS

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Crosslinked polyetherurethane (PEU) copolymer networks consisting of the low molecular weight poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) segments with an aliphatic diisocyanate were synthesized and complexed with a LiClO4 salt to form solid polymer electrolytes. The ionic conductivities of these samples were measured as a function of PEO composition at various temperatures. And a solid Li-7 NMR relaxation technique was used as a means of understanding the local environments and dynamics of the lithium ions in the polymer electrolytes. The difference in spin-spin relaxation times (T2) between two spectral components enabled to their separation, and thus we could monitor the mobile Li+ ion concentration and its motion as a function of PEO composition and temperature.
Publisher
SOC POLYMER SCIENCE JAPAN
Issue Date
1994-09
Language
English
Article Type
Article
Keywords

NUCLEAR-MAGNETIC-RESONANCE; LITHIUM PERCHLORATE; POLY(PROPYLENE OXIDE); POLY(ETHYLENE OXIDE); METAL-SALTS; COMPLEXES; MORPHOLOGY; MOBILITY

Citation

POLYMER JOURNAL, v.26, no.9, pp.993 - 1001

ISSN
0032-3896
DOI
10.1295/polymj.26.993
URI
http://hdl.handle.net/10203/59535
Appears in Collection
CBE-Journal Papers(저널논문)
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