Journal
EUROPHYSICS LETTERS
Volume 54, Issue 3, Pages 347-353Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2001-00249-7
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The average local structure around Li cations in a polymer electrolyte, P(EO)(7.5)LiClO4, has been determined by neutron diffraction with Li isotope substitution. In this environment, the Li ions are predominantly coordinated by 4 similar to 5 ether oxygens. The intermediate-range order is enhanced relative to the pure polymer by the expansion of the network on the addition of the salt. The excess volume introduced must play a key role in facilitating the lithium ion conduction.
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