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Morphology of Lithium-Containing Diblock Copolymer Thin Films

✍ Scribed by Ezzeldin Metwalli; Man Nie; Volker Körstgens; Jan Perlich; Stephan V. Roth; Peter Müller-Buschbaum

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
669 KB
Volume
212
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The morphology of block‐copolymer, ion‐conductive, electrolyte thin films is studied. Based on PS‐b‐PEO and the alkali salt Li[N(CF~3~SO~2~)~2~], hybrid structures are probed as a function of Li/PEO ratio. Using optical microscopy, AFM and grazing incidence SAXS, films of 50 nm thickness are probed right after spin‐coating. Below a critical Li/PEO weight ratio of 0.015, the crystallization of PEO is prohibited and nanostructured block copolymer films with Li incorporated in the PEO domains are obtained. In the range of 0.015 > Li/PEO > 0.035, aggregation of Li salt on the polymer film surface occurs. Solvent‐vapor annealing of such films further enriches the Li salt at the surface. For Li/PEO > 0.035, the electrolyte films become unstable and dewet on the surface of the silicon substrate. magnified image

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