期刊
ELECTROCHIMICA ACTA
卷 130, 期 -, 页码 606-618出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.03.072
关键词
NMR; Liquid electrolyte; Conductivity; Ionic association
资金
- EPSRC
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 (Li-7), fluorine (F-19) and hydrogen (H-1) 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. (C) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据