Decoupling of Ionic Trasport from Segmental Relaxation in Polymer Electrolytes

Journal Article · Sun Jan 01 04:00:00 EST 2012 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.108.088303· OSTI ID:1096340

Wang, Yangyang ^[1]; Agapov, Alexander L ^[1]; Fan, Fei ^[1]; Hong, Kunlun ^[1]; Yu, Xiang ^[1]; Mays, Jimmy ^[1]; Sokolov, Alexei P ^[1]

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1. ORNL

We present detailed studies of the relationship between ionic conductivity and segmental relaxation in polymer electrolytes. The analysis shows that the ionic conductivity can be decoupled from segmental dynamics and the strength of the decoupling correlates with the fragility but not with the glass transition temperature. These results call for a revision of the current picture of ionic transport in polymer electrolytes. We relate the observed decoupling phenomenon to frustration in packing of rigid polymers, where the loose local structure is also responsible for the increase in their fragility.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1096340
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 108; ISSN 0031-9007
• Country of Publication: United States
• Language: English