Richardson, PM, Voice, AM and Ward, IM (2014) Pulsed-Field Gradient NMR Self Diffusion and Ionic Conductivity Measurements for Liquid Electrolytes Containing LiBF₄ and Propylene Carbonate. Electrochimica Acta, 130. pp. 606-618. ISSN 0013-4686
Abstract
Liquid electrolytes have been prepared using lithium tetrafluoroborate (LiBF₄) and propylene carbonate (PC). Pulsed-field gradient nuclear magnetic resonance (PFG-NMR) measurements were taken for the cation, anion and solvent molecules using lithium (⁷Li), fluorine (¹⁹F) and hydrogen (¹H) nuclei, respectively. It was found that lithium diffusion was slow compared to the much larger fluorinated BF₄ anion likely resulting from a large solvation shell of the lithium. Ionic conductivity and viscosity have also been measured for a range of salt concentrations and temperatures. By comparing the measured conductivity with a ideal predicted conductivity derived from the Nernst-Einstein equation and self diffusion coefficients the degree of ionic association of the anion and cation was determined and was observed to increase with salt concentration and temperature. Using the measured viscosity and self diffusion coefficients the effective radius of each of the species was determined for various salt concentrations.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 Elsevier Ltd. This is an author produced version of a paper published in Electrochimica Acta. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | NMR; Liquid electrolyte; Conductivity; Ionic association |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Soft Matter Physics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Jun 2016 15:41 |
Last Modified: | 15 Jan 2018 21:39 |
Published Version: | http://dx.doi.org/10.1016/j.electacta.2014.03.072 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.electacta.2014.03.072 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:99902 |