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Title: Examination of the fundamental relation between ionic transport and segmental relaxation in polymer electrolytes

Abstract

Replacing traditional liquid electrolytes by polymers will significantly improve electrical energy storage technologies. Despite significant advantages for applications in electrochemical devices, the use of solid polymer electrolytes is strongly limited by their poor ionic conductivity. The classical theory predicts that the ionic transport is dictated by the segmental motion of the polymer matrix. As a result, the low mobility of polymer segments is often regarded as the limiting factor for development of polymers with sufficiently high ionic conductivity. Here, we show that the ionic conductivity in many polymers can be strongly decoupled from their segmental dynamics, in terms of both temperature dependence and relative transport rate. Based on this principle, we developed several polymers with superionic conductivity. The observed fast ion transport suggests a fundamental difference between the ionic transport mechanisms in polymers and small molecules and provides a new paradigm for design of highly conductive polymer electrolytes.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1159497
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Polymer; Journal Volume: 55; Journal Issue: 16
Country of Publication:
United States
Language:
English

Citation Formats

Wang, Yangyang, Fan, Fei, Agapov, Alexander L, Saito, Tomonori, Yang, Jun, Yu, Xiang, Hong, Kunlun, Mays, Jimmy, and Sokolov, Alexei P. Examination of the fundamental relation between ionic transport and segmental relaxation in polymer electrolytes. United States: N. p., 2014. Web. doi:10.1016/j.polymer.2014.06.085.
Wang, Yangyang, Fan, Fei, Agapov, Alexander L, Saito, Tomonori, Yang, Jun, Yu, Xiang, Hong, Kunlun, Mays, Jimmy, & Sokolov, Alexei P. Examination of the fundamental relation between ionic transport and segmental relaxation in polymer electrolytes. United States. doi:10.1016/j.polymer.2014.06.085.
Wang, Yangyang, Fan, Fei, Agapov, Alexander L, Saito, Tomonori, Yang, Jun, Yu, Xiang, Hong, Kunlun, Mays, Jimmy, and Sokolov, Alexei P. Wed . "Examination of the fundamental relation between ionic transport and segmental relaxation in polymer electrolytes". United States. doi:10.1016/j.polymer.2014.06.085.
@article{osti_1159497,
title = {Examination of the fundamental relation between ionic transport and segmental relaxation in polymer electrolytes},
author = {Wang, Yangyang and Fan, Fei and Agapov, Alexander L and Saito, Tomonori and Yang, Jun and Yu, Xiang and Hong, Kunlun and Mays, Jimmy and Sokolov, Alexei P},
abstractNote = {Replacing traditional liquid electrolytes by polymers will significantly improve electrical energy storage technologies. Despite significant advantages for applications in electrochemical devices, the use of solid polymer electrolytes is strongly limited by their poor ionic conductivity. The classical theory predicts that the ionic transport is dictated by the segmental motion of the polymer matrix. As a result, the low mobility of polymer segments is often regarded as the limiting factor for development of polymers with sufficiently high ionic conductivity. Here, we show that the ionic conductivity in many polymers can be strongly decoupled from their segmental dynamics, in terms of both temperature dependence and relative transport rate. Based on this principle, we developed several polymers with superionic conductivity. The observed fast ion transport suggests a fundamental difference between the ionic transport mechanisms in polymers and small molecules and provides a new paradigm for design of highly conductive polymer electrolytes.},
doi = {10.1016/j.polymer.2014.06.085},
journal = {Polymer},
number = 16,
volume = 55,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 2014},
month = {Wed Jan 01 00:00:00 EST 2014}
}