Please use this identifier to cite or link to this item: doi:10.22028/D291-28988
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Title: An Ambient Temperature Electrolyte with Superior Lithium Ion Conductivity based on a Self-Assembled Block Copolymer
Author(s): Dörr, Tobias S.
Pelz, Alexander
Zhang, Peng
Kraus, Tobias
Winter, Martin
Wiemhöfer, Hans-Dieter
Language: English
Title: Chemistry - a European journal
Volume: 24
Issue: 32
Startpage: 8061
Endpage: 8065
Publisher/Platform: Wiley
Year of Publication: 2018
Publikation type: Journal Article
Abstract: In searching for polymer-based electrolytes with improved performance for lithium ion and lithium metal batteries, we studied block copolymer electrolytes with high amounts of bis(trifluoromethane)sulfonimide lithium obtained by macromolecular co-assembly of a poly(isoprene)-block-poly(styrene)-block-poly(ethylene oxide) and the salt from tetrahydrofuran. Particularly, an ultra-short poly(ethylene oxide) block of 2100 g mol-1 was applied, giving rise to 2D continuous lamellar microstructures. The macroscopic stability was ensured with major blocks from poly(isoprene) and poly(styrene), which separated the ionic conductive PEO/salt lamellae. Thermal annealing led to high ionic conductivities of 1.4 mS cm-1 at 20 °C with low activation energy and a superior lithium ion transference number of 0.7, accompanied by an improved mechanical stability (storage modulus of up to 107  Pa). With high Li:O ratios >1, we show a viable concept to achieve fast Li+ transport in block copolymers (BCP), decoupled from slow polymer relaxation.
DOI of the first publication: 10.1002/chem.201801521
URL of the first publication:
Link to this record: hdl:20.500.11880/27929
ISSN: 1521-3765
Date of registration: 27-Sep-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Chemie
Professorship: NT - Prof. Dr. Tobias Kraus
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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