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Title: Transport properties of the solid polymer electrolyte system P(EO){sub n}LiTFSI

Values for the lithium ion transference number ({tau}{sub +}{sup 0}) are reported for the solid polymer electrolyte system poly(ethylene oxide) (PEO) complexed with Li(CF{sub 3}SO{sub 2}){sub 2}N (LiTFSI). {tau}{sub +}{sup 0} ranges from 0.17 {+-} 0.17 to 0.60 {+-} 0.03 in the salt concentration (c) region of 742 to 2,982 mol/m{sup 3} at 85 C. The concentration dependence of {tau}{sub +}{sup 0} and the molar ionic conductivity ({Lambda}) are shown to be in good agreement with a free volume approach over the salt-rich composition range investigated. The present {tau}{sub +}{sup 0} results were obtained using an electrochemical technique based on concentrated solution theory. This experimentally straightforward method is herein demonstrated to give accurate results for a highly concentrated SPE system, without relying on any dubious simplifications regarding the state of the electrolyte.
Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
20030674
DOE Contract Number:
AC03-76SF00098
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical; Journal Volume: 104; Journal Issue: 15; Other Information: PBD: 20 Apr 2000
Research Org:
Lawrence Berkeley National Lab., CA (US); Univ. of California, Berkeley, CA (US)
Sponsoring Org:
US Department of Energy; Blance-flor Boncompagni-Ludovisi, nee Bildt; Wenner-Gren Foundation
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; POLYETHYLENE GLYCOLS; POLYMERS; ELECTRIC BATTERIES; SOLID ELECTROLYTES; LITHIUM COMPLEXES