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Title: Rate theory of solvent exchange and kinetics of Li+ - BF4-/PF6- ion pairs in acetonitrile

Abstract

In this paper, we describe our efforts to apply rate theories in studies of solvent exchange around Li+(aq) and the kinetics of ion pairings in lithium-ion batteries (LIB). We report one of the first computer simulations of the exchange dynamics around hydrated Li+ in acetonitrile (ACN), which is common solvent used in LIBs. We also provide details of the ion-pairing kinetics of Li+-[BF4] and Li+-[PF6] in ACN. Using our polarizable force-field models and employing classical rate theories of chemical reactions, we examine the ACN exchange process between the first and second solvation shells around Li+(aq). We calculate exchange rates using transition state theory and weighted them with transmission coefficients determined by the reactive flux and Impey, Madden, and McDonald approaches and Grote-Hynes theory. We found the relaxation times changed from 180 ps to 4600 ps and from 30 ps to 280 ps for Li+-[BF4] and Li+-[PF6] ion pairs, respectively. These results confirm that the solvent response to the kinetics of ion pairing is significant. Our results also show that, in addition to affecting the free energy of solvation into ACN, the anion type also should significantly influence the kinetics of ion pairing. Here, these results will increase our understanding ofmore » the thermodynamic and kinetic properties of LIB systems.« less

Authors:
 [1]; ORCiD logo [2]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Univ. of Wisconsin - Parkside, Kenosha, WI (United States)
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
OSTI Identifier:
1340769
Alternate Identifier(s):
OSTI ID: 1318756
Report Number(s):
PNNL-SA-118788
Journal ID: ISSN 0021-9606; JCPSA6; KC0301050
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 145; Journal Issue: 9; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Ions and properties; Batteries; Computer simulation; Ionic conductivity; Solvation; Chemical compounds; Free energy; Transition state theory; Polarizable force fields; Electrolytes

Citation Formats

Dang, Liem X., and Chang, Tsun-Mei. Rate theory of solvent exchange and kinetics of Li+ - BF4-/PF6- ion pairs in acetonitrile. United States: N. p., 2016. Web. doi:10.1063/1.4961904.
Dang, Liem X., & Chang, Tsun-Mei. Rate theory of solvent exchange and kinetics of Li+ - BF4-/PF6- ion pairs in acetonitrile. United States. https://doi.org/10.1063/1.4961904
Dang, Liem X., and Chang, Tsun-Mei. Fri . "Rate theory of solvent exchange and kinetics of Li+ - BF4-/PF6- ion pairs in acetonitrile". United States. https://doi.org/10.1063/1.4961904. https://www.osti.gov/servlets/purl/1340769.
@article{osti_1340769,
title = {Rate theory of solvent exchange and kinetics of Li+ - BF4-/PF6- ion pairs in acetonitrile},
author = {Dang, Liem X. and Chang, Tsun-Mei},
abstractNote = {In this paper, we describe our efforts to apply rate theories in studies of solvent exchange around Li+(aq) and the kinetics of ion pairings in lithium-ion batteries (LIB). We report one of the first computer simulations of the exchange dynamics around hydrated Li+ in acetonitrile (ACN), which is common solvent used in LIBs. We also provide details of the ion-pairing kinetics of Li+-[BF4] and Li+-[PF6] in ACN. Using our polarizable force-field models and employing classical rate theories of chemical reactions, we examine the ACN exchange process between the first and second solvation shells around Li+(aq). We calculate exchange rates using transition state theory and weighted them with transmission coefficients determined by the reactive flux and Impey, Madden, and McDonald approaches and Grote-Hynes theory. We found the relaxation times changed from 180 ps to 4600 ps and from 30 ps to 280 ps for Li+-[BF4] and Li+-[PF6] ion pairs, respectively. These results confirm that the solvent response to the kinetics of ion pairing is significant. Our results also show that, in addition to affecting the free energy of solvation into ACN, the anion type also should significantly influence the kinetics of ion pairing. Here, these results will increase our understanding of the thermodynamic and kinetic properties of LIB systems.},
doi = {10.1063/1.4961904},
journal = {Journal of Chemical Physics},
number = 9,
volume = 145,
place = {United States},
year = {Fri Sep 02 00:00:00 EDT 2016},
month = {Fri Sep 02 00:00:00 EDT 2016}
}

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Works referencing / citing this record:

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