title: Decoupling of ionic transport from segmental relaxation in polymer electrolytes.
abstract: 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.
authors.affiliation: Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: Yangyang
authors.initials: Y
authors.lastname: Wang
authors.forename: Alexander L
authors.initials: AL
authors.lastname: Agapov
authors.forename: Fei
authors.initials: F
authors.lastname: Fan
authors.forename: Kunlun
authors.initials: K
authors.lastname: Hong
authors.forename: Xiang
authors.initials: X
authors.lastname: Yu
authors.forename: Jimmy
authors.initials: J
authors.lastname: Mays
authors.forename: Alexei P
authors.initials: AP
authors.lastname: Sokolov