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Polyimide-polyether bindersediminishing the carbon content in lithium-sulfur batteries
Univ Basque Country UPV EHU, POLYMAT, Joxe Mari Korta Ctr, Avda Tolosa 72, Donostia San Sebastian 20018, Spain.
Univ Basque Country UPV EHU, POLYMAT, Joxe Mari Korta Ctr, Avda Tolosa 72, Donostia San Sebastian 20018, Spain.
CIC EnergiGUNE, Alava Technol Pk,Albert Einstein 48, Minano 01510, Alava, Spain.
CIC EnergiGUNE, Alava Technol Pk,Albert Einstein 48, Minano 01510, Alava, Spain.
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2017 (English)In: MATERIALS TODAY ENERGY, ISSN 2468-6069, Vol. 6, p. 264-270Article in journal (Refereed) Published
Abstract [en]

Lithium-sulfur batteries are on the run to become the next generation energy storage technology. First of all due to its high theoretical energy density but also for its sustainability and low cost. However, there are still several challenges to take into account such as reducing the shuttle effect, decreasing the amount of conductive carbon to increase the energy density or enhancing the sulfur utilization. Herein, redox-active binders based on polyimide-polyether copolymers have been proposed as a solution to those drawbacks. These multiblock copolymers combine the ability of poly (ethylene oxide) to act as polysulfide trap and the properties of the imide groups to redox mediate the charge-discharge of sulfur. Thus, poly (ethylene oxide) block helps with the shuttle effect and mass transport in the electrode whereas the polyimide part enhances the charge transfer promoting the sulfur utilization. Sulfur cathodes containing pyromellitic, naphthalene or perylene polyimide-polyether binders featured improved cell performance in comparison with pure PEO binder. Among them, the electrode with naphthalene polyimide-PEO binder showed the best results with an initial capacity of 1300 mA h g(-1) at C/5, low polarization and 70% capacity retention after 30 cycles. Reducing the amount of carbon black in the cathode to 5 wt%, the cell with the redox-active binder was able to deliver 500 mA h g(-1) at C/5 with 78% capacity retention after 20 cycles. Our results demonstrate the possibility to reduce the amount of carbon by introducing polyimide-polyether copolymers as redox-active binders, increasing the sulfur utilization, redox kinetics and stability of the cell. (C) 2017 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2017. Vol. 6, p. 264-270
Keywords [en]
Lithium-sulfur batteries, Polyimides, Redox mediators, Redox-active binders, Diminishing carbon
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-359811DOI: 10.1016/j.mtener.2017.11.001ISI: 000439097500026OAI: oai:DiVA.org:uu-359811DiVA, id: diva2:1248150
Funder
EU, European Research Council, 306250Available from: 2018-09-14 Created: 2018-09-14 Last updated: 2018-09-14Bibliographically approved

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Hernández, Guiomar

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