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Int. J. Mol. Sci. 2015, 16(9), 20258-20276;

Interaction of High Flash Point Electrolytes and PE-Based Separators for Li-Ion Batteries

Institut für Angewandte Materialien-Werkstoffkunde, Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Institut für Angewandte Materialien-Keramische Werkstoffe und Technologien, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Institut für Mikrosystemtechnik, Universität Freiburg, Georges-Köhler-Allee 102, 79110 Freiburg, Germany
Author to whom correspondence should be addressed.
Academic Editor: Qinghua Qin
Received: 14 July 2015 / Revised: 10 August 2015 / Accepted: 18 August 2015 / Published: 27 August 2015
(This article belongs to the Section Materials Science)
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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 η = 4–400 mPa∙s and surface tension is finely graduated in a range of γL = 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. View Full-Text
Keywords: Li-ion battery; electrolytes; separators; contact angle; safety Li-ion battery; electrolytes; separators; contact angle; safety

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Hofmann, A.; Kaufmann, C.; Müller, M.; Hanemann, T. Interaction of High Flash Point Electrolytes and PE-Based Separators for Li-Ion Batteries. Int. J. Mol. Sci. 2015, 16, 20258-20276.

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