A Liquid Inorganic Electrolyte Showing an Unusually High Lithium Ion Transference Number: A Concentrated Solution of LiAlCl 4 in Sulfur Dioxide

Robert Hartl, Matthias Fleischmann, Ruth M. Gschwind, Martin Winter and Heiner Jakob Gores
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Robert Hartl: Workgroup Electrochemistry and Electrolytes, Institute of Theoretical and Physical Chemistry, University of Regensburg, 93040 Regensburg, Germany
Matthias Fleischmann: Institute of Organic Chemistry, University of Regensburg, 93040 Regensburg, Germany
Ruth M. Gschwind: Institute of Organic Chemistry, University of Regensburg, 93040 Regensburg, Germany
Martin Winter: Electrochemical Energy Technology (MEET) Battery Research Center, Institute of Physical Chemistry, University of Münster, Corrensstr. 46, 48149 Münster, Germany
Heiner Jakob Gores: Electrochemical Energy Technology (MEET) Battery Research Center, Institute of Physical Chemistry, University of Münster, Corrensstr. 46, 48149 Münster, Germany

Energies, 2013, vol. 6, issue 9, 1-17

Abstract: We report on studies of an inorganic electrolyte: LiAlCl 4 in liquid sulfur dioxide. Concentrated solutions show a very high conductivity when compared with typical electrolytes for lithium ion batteries that are based on organic solvents. Our investigations include conductivity measurements and measurements of transference numbers via nuclear magnetic resonance (NMR) and by a classical direct method, Hittorf’s method. For the use of Hittorf’s method, it is necessary to measure the concentration of the electrolyte in a selected cell compartment before and after electrochemical polarization very precisely. This task was finally performed by potentiometric titration after hydrolysis of the salt. The Haven ratio was determined to estimate the association behavior of this very concentrated electrolyte solution. The measured unusually high transference number of the lithium cation of the studied most concentrated solution, a molten solvate LiAlCl 4 × 1.6SO 2 , makes this electrolyte a promising alternative for lithium ion cells with high power ability.

Keywords: lithium ion transference number; lithium tetrachloroaluminate; sulfur dioxide; Hittorf’s method; diffusion-ordered spectroscopy (DOSY)-NMR (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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