期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 164, 期 12, 页码 A2434-A2440出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0941712jes
关键词
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资金
- DOE's Office of Biological and Environmental Research
- Assistant Secretary for Energy Efficiency and Renewable Energy, Vehicle Technologies Office, of the U. S. Department of Energy under the CAEBAT3 Program [DE-AC02-05CH11231]
- Argonne, a U. S. Department of Energy Office of Science laboratory [DE-AC02-06CH11357]
The presence of lithium hexafluorophosphate (LiPF6) ion pairs in carbonate-based electrolyte solutions is widely accepted in the field of battery electrolyte research and is expected to affect solution transport properties. No existing techniques are capable of directly quantifying salt dissociation in these solutions. Previous publications by others have provided estimates of dissociation degrees using dilute solution theory and pulsed field gradient nuclear magnetic resonance spectroscopy (PFG-NMR) measurements of self-diffusivity. However, the behavior of a concentrated electrolyte solution can deviate significantly from dilute solution theory predictions. This work, for the first time, instead uses Onsager-Stefan-Maxwell concentrated solution theory and the generalized Darken relation with PFG-NMR measurements to quantify the degrees of dissociation in electrolyte solutions (LiPF6 in ethylene carbonate/diethyl carbonate, 1:1 by weight). At LiPF6 concentrations ranging from 0.1 M to 1.5 M, the salt dissociation degree is found to range from 61% to 37%. Transport properties are then calculated through concentrated solution theory with corrections for these significant levels of ion pairing. (C) 2017 The Electrochemical Society. All rights reserved.
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