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Interaction of high flash point electrolytes and PE-based separators for Li-ion batteries

Hofmann, A.; Kaufmann, C.; Müller, M.; Hanemann, T.

In this study, promising electrolytes for use in Li-ion batteries are studied in terms of interacting and wetting polyethylene (PE) and particle-coated PE separators. The electrolytes are characterized according to their physicochemical properties, where the flow characteristics and the surface tension are of particular interest for electrolyte-separator interactions. The viscosity of the electrolytes is determined to be in a range of eta=4- 400 mPa·s and surface tension is finely graduated in a range of gamma L = 23.3-38.1 mN·m-1. It is verified that the technique of drop shape analysis can only be used in a limited matter to prove the interaction, uptake and penetration of electrolytes by separators. Cell testing of Li|NMC half cells reveals that those cell results cannot be inevitably deduced from physicochemical electrolyte properties as well as contact angle analysis. On the other hand, techniques are more suitable which detect liquid penetration into the interior of the separator. It is expected that the results can help fundamental researchers as well as users of novel electrolytes in current-day Li-ion battery technologies for developing and using novel material combinations.

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DOI: 10.5445/IR/1000049761
DOI: 10.3390/ijms160920258
Zitationen: 8
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Maschinenbau (MACH)
Institut für Angewandte Materialien - Keramische Werkstoffe und Technologien (IAM-KWT)
Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 1661-6596
KITopen-ID: 1000049761
HGF-Programm 37.01.11 (POF III, LK 01) Elektrochemistry, Theory and Modelling
Erschienen in International Journal of Molecular Sciences
Verlag MDPI
Band 16
Heft 9
Seiten 20258-20276
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Dimensions
Web of Science
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