Tetraarylborate polymer networks as single-ion conducting solid electrolytes

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Abstract

A new family of solid polymer electrolytes based upon anionic tetrakis(phenyl)borate tetrahedral nodes and linear bis-alkyne linkers is reported. Sonogashira polymerizations using tetrakis(4-iodophenyl)borate, tetrakis(4-iodo-2,3,5,6-tetrafluorophenyl)borate and tetrakis(4-bromo-2,3,5,6-tetrafluorophenyl)borate delivered highly cross-linked polymer networks with both 1,4-diethynylbeznene and a tri(ethylene glycol) substituted derivative. Promising initial conductivity metrics have been observed, including high room temperature conductivities (up to 2.7 × 10 -4 S cm -1), moderate activation energies (0.25-0.28 eV), and high lithium ion transport numbers (up to t Li + = 0.93). Initial investigations into the effects of important materials parameters such as bulk morphology, porosity, fluorination, and other chemical modification, provide starting design parameters for further development of this new class of solid electrolytes.

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Van Humbeck, J. F., Aubrey, M. L., Alsbaiee, A., Ameloot, R., Coates, G. W., Dichtel, W. R., & Long, J. R. (2015). Tetraarylborate polymer networks as single-ion conducting solid electrolytes. Chemical Science, 6(10), 5499–5505. https://doi.org/10.1039/c5sc02052b

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