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Solvate Structures and Computational/Spectroscopic Characterization of LiBF4 Electrolytes

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posted on 14.08.2014, 00:00 by Daniel M. Seo, Paul D. Boyle, Joshua L. Allen, Sang-Don Han, Erlendur Jónsson, Patrik Johansson, Wesley A. Henderson
Crystal structures have been determined for both LiBF4 and HBF4 solvates: (acetonitrile)2:LiBF4, (ethylene glycol diethyl ether)1:LiBF4, (diethylene glycol diethyl ether)1:LiBF4, (tetrahydrofuran)1:LiBF4, (methyl methoxyacetate)1:LiBF4, (succinonitrile)1:LiBF4, (N,N,N′,N″,N″-pentamethyldiethylenetriamine)1:HBF4, (N,N,N′,N′-tetramethylethylenediamine)3/2:HBF4, and (phenanthroline)2:HBF4. These, as well as other known LiBF4 solvate structures, have been characterized by Raman vibrational spectroscopy to unambiguously assign the anion Raman band positions to specific forms of BF4···Li+ cation coordination. In addition, complementary DFT calculations of BF4···Li+ cation complexes have provided additional insight into the challenges associated with accurately interpreting the anion interactions from experimental Raman spectra. This information provides a crucial tool for the characterization of the ionic association interactions within electrolytes.