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Title: Evaluating Transport Properties and Ionic Dissociation of LiPF 6 in Concentrated Electrolyte

Abstract

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1398176
Report Number(s):
PNNL-SA-128904
Journal ID: ISSN 0013-4651; KP1704020
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 164; Journal Issue: 12; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Feng, Zhange, Higa, Kenneth, Han, Kee Sung, and Srinivasan, Venkat. Evaluating Transport Properties and Ionic Dissociation of LiPF 6 in Concentrated Electrolyte. United States: N. p., 2017. Web. doi:10.1149/2.0941712jes.
Feng, Zhange, Higa, Kenneth, Han, Kee Sung, & Srinivasan, Venkat. Evaluating Transport Properties and Ionic Dissociation of LiPF 6 in Concentrated Electrolyte. United States. doi:10.1149/2.0941712jes.
Feng, Zhange, Higa, Kenneth, Han, Kee Sung, and Srinivasan, Venkat. Sun . "Evaluating Transport Properties and Ionic Dissociation of LiPF 6 in Concentrated Electrolyte". United States. doi:10.1149/2.0941712jes.
@article{osti_1398176,
title = {Evaluating Transport Properties and Ionic Dissociation of LiPF 6 in Concentrated Electrolyte},
author = {Feng, Zhange and Higa, Kenneth and Han, Kee Sung and Srinivasan, Venkat},
abstractNote = {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.},
doi = {10.1149/2.0941712jes},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 12,
volume = 164,
place = {United States},
year = {2017},
month = {1}
}

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