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Titel: Self-assembled block copolymer clectrolytes: enabling superior ambient cationic conductivity and electrochemical Stability
VerfasserIn: Pelz, Alexander
Dörr, Tobias Sebastian
Zhang, Peng
de Oliveira, Peter William
Winter, Martin
Wiemhöfer, Hans-Dieter
Kraus, Tobias
Sprache: Englisch
Titel: Chemistry of materials
Bandnummer: 31
Heft: 1
Startseite: 277
Endseite: 285
Verlag/Plattform: ACS
Erscheinungsjahr: 2019
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: Block copolymers are promising materials for electrolytes in lithium metal batteries that can be tuned by changing the individual blocks to independently optimize ion transport as well as electrochemical and mechanical stability. We explored the performance of electrolytes based on modified triblock copolymers, poly(isoprene)-block-poly(styrene)-block-poly(ethylene oxide). Large polyethylene oxide (PEO) blocks with a molecular mass of 53 kg mol–1 allowed only for low lithium salt loadings and led to poor ionic conductivity below 60 °C. However, we found that unusually small molecular weight of the ion solvating PEO blocks down to 2 kg mol–1 enabled polymer-in-salt loadings of up to 5:1 Li/EO. A superior total ionic conductivity greater than 1 mS cm–1 was found for optimized compositions above 0 °C with remarkably low temperature dependence in a wide range from −20 to 90 °C. We believe that highly ordered two-dimensional lamellae from the controlled self-assembly established a beneficial environment for ionic transport with ionic mobility decoupled from segmental polymer motion. This also explains lithium ion transference numbers as high as 0.7 that were obtained for the high conductivity samples.
DOI der Erstveröffentlichung: 10.1021/acs.chemmater.8b04686
URL der Erstveröffentlichung: https://pubs.acs.org/doi/abs/10.1021/acs.chemmater.8b04686
Link zu diesem Datensatz: hdl:20.500.11880/27941
http://dx.doi.org/10.22028/D291-28999
ISSN: 0897-4756
1520-5002
Datum des Eintrags: 27-Sep-2019
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Chemie
Professur: NT - Prof. Dr. Tobias Kraus
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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