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Title: Ionic Conductivity of Block Copolymer Electrolytes in the Vicinity of Order−Disorder and Order−Order Transitions

Abstract

Order-order and order-disorder phase transitions in mixtures of poly(styrene-block-ethylene oxide) (SEO) copolymers and lithium bis(trifluoromethylsulfonimide) (LiTFSI), a common lithium salt used in polymer electrolytes, were studied using a combination of small-angle X-ray scattering (SAXS), birefringence, and ac impedance spectroscopy. The SEO/LiTFSI mixtures exhibit lamellar, hexagonally packed cylinders, and gyroid microphases. The molecular weight of the blocks and the salt concentration was adjusted to obtain order-order and order-disorder transition temperatures within the available experimental window. The ionic conductivities of the mixtures, normalized by the ionic conductivity of a 20 kg/mol homopolymer PEO sample at the salt concentration and temperature of interest, were independent of temperature, in spite of the presence of the above-mentioned phase transitions.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1005838
Resource Type:
Journal Article
Journal Name:
Macromolecules
Additional Journal Information:
Journal Volume: 42; Journal Issue: (15) ; 08, 2009
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COPOLYMERS; ELECTROLYTES; IONIC CONDUCTIVITY; LITHIUM COMPOUNDS; MOLECULAR WEIGHT; PHASE TRANSFORMATIONS; MICROSTRUCTURE

Citation Formats

Wanakule, Nisita S, Panday, Ashoutosh, Mullin, Scott A, Gann, Eliot, Hexemer, Alex, Balsara, Nitash P, UCB), and LBNL). Ionic Conductivity of Block Copolymer Electrolytes in the Vicinity of Order−Disorder and Order−Order Transitions. United States: N. p., 2009. Web. doi:10.1021/ma900401a.
Wanakule, Nisita S, Panday, Ashoutosh, Mullin, Scott A, Gann, Eliot, Hexemer, Alex, Balsara, Nitash P, UCB), & LBNL). Ionic Conductivity of Block Copolymer Electrolytes in the Vicinity of Order−Disorder and Order−Order Transitions. United States. https://doi.org/10.1021/ma900401a
Wanakule, Nisita S, Panday, Ashoutosh, Mullin, Scott A, Gann, Eliot, Hexemer, Alex, Balsara, Nitash P, UCB), and LBNL). Tue . "Ionic Conductivity of Block Copolymer Electrolytes in the Vicinity of Order−Disorder and Order−Order Transitions". United States. https://doi.org/10.1021/ma900401a.
@article{osti_1005838,
title = {Ionic Conductivity of Block Copolymer Electrolytes in the Vicinity of Order−Disorder and Order−Order Transitions},
author = {Wanakule, Nisita S and Panday, Ashoutosh and Mullin, Scott A and Gann, Eliot and Hexemer, Alex and Balsara, Nitash P and UCB) and LBNL)},
abstractNote = {Order-order and order-disorder phase transitions in mixtures of poly(styrene-block-ethylene oxide) (SEO) copolymers and lithium bis(trifluoromethylsulfonimide) (LiTFSI), a common lithium salt used in polymer electrolytes, were studied using a combination of small-angle X-ray scattering (SAXS), birefringence, and ac impedance spectroscopy. The SEO/LiTFSI mixtures exhibit lamellar, hexagonally packed cylinders, and gyroid microphases. The molecular weight of the blocks and the salt concentration was adjusted to obtain order-order and order-disorder transition temperatures within the available experimental window. The ionic conductivities of the mixtures, normalized by the ionic conductivity of a 20 kg/mol homopolymer PEO sample at the salt concentration and temperature of interest, were independent of temperature, in spite of the presence of the above-mentioned phase transitions.},
doi = {10.1021/ma900401a},
url = {https://www.osti.gov/biblio/1005838}, journal = {Macromolecules},
number = (15) ; 08, 2009,
volume = 42,
place = {United States},
year = {2009},
month = {9}
}