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Exploring the use of oligomeric carbonates as porogens and ion-conductors in phase-separated structural electrolytes for Lithium-ion batteries
KTH Royal Inst Technol, Dept Fibre & Polymer Technol, Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0002-9862-7375
KTH Royal Inst Technol, Dept Fibre & Polymer Technol, Stockholm, Sweden..
2023 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 449, article id 142176Article in journal (Refereed) Published
Abstract [en]

Phase-separated structural battery electrolytes (SBEs) have the potential to enhance the mechanical stability of the electrolyte while maintaining a high ion conduction. This can be achieved via polymerization-induced phase separation (PIPS), which creates a two-phase system with a liquid electrolyte percolating a mesoporous ther-moset. While previous studies have used commercially available liquid electrolytes, this study investigates the use of novel oligomeric carbonates to enhanced the safety of the SBEs. Increasing the carbonate chain length significantly enhances the thermal stability of the SBEs. Tuning the molecular structure of the liquid electrolyte has a significant effect on the PIPS process and SBE morphology. Using a combination of analyses on a series of wet and dried SBEs, the complex interplay between the phases is interpreted. When an increased pore size is achieved, it leads to a lower MacMullin number (NM). A conductivity of 2 x 10-5 S/cm with a NM=13 could be achieved, while maintaining a thermal stability up to 150 degrees C. The present study demonstrates a versatile approach to tailor this type of electrolyte.

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 449, article id 142176
Keywords [en]
Structural batteries, Polymer electrolyte, Polymerization-induced phase separation, Ionic conductivity, McMullin number, Carbonate oligomers, Lithium ion
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-500585DOI: 10.1016/j.electacta.2023.142176ISI: 000957971600001OAI: oai:DiVA.org:uu-500585DiVA, id: diva2:1752413
Funder
Vinnova, 2019-00064StandUpEU, Horizon 2020, 875514Available from: 2023-04-21 Created: 2023-04-21 Last updated: 2023-10-16Bibliographically approved

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Mindemark, Jonas

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