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Competitive Lithium Solvation of Linear and Cyclic Carbonates from Quantum Chemistry

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C5CP05121E· OSTI ID:1332623
The composition of the lithium cation (Li+) solvation shell in mixed linear and cyclic carbonate-based electrolytes has been re-examined using Born–Oppenheimer molecular dynamics (BOMD) as a function of salt concentration with ethylene carbonate:dimethyl carbonate (EC:DMC)-LiPF6 as a model system. A slight coordination preference for EC over DMC to a Li+ was found at low salt concentrations, while a slightly higher preference for DMC over EC was found at high salt concentrations. Analysis of the relative binding energies of the (EC)n(DMC)m-Li+ and (EC)n(DMC)m-LiPF6 solvates in the gas-phase and for an implicit solvent (as a function of the solvent dielectric constant) indicated that the DMC-containing Li+ solvates were stabilized relative to (EC4)-Li+ and (EC)3-LiPF6 by immersing them in the implicit solvent. Such stabilization was more pronounced in the implicit solvents with a high dielectric constant. Results from previous Raman and IR experiments were reanalyzed and reconciled by correcting them for changes of the Raman activities, IR intensities and band shifts for the solvents which occur upon Li+ coordination. After these correction factors were applied to the results of BOMD simulations, the composition of the Li+ solvation shell from the BOMD simulations was found to agree well with the solvation numbers extracted from Raman experiments. Finally, the mechanism of the Li+ diffusion in the (EC:DMC)LiPF6 mixed solvent electrolyte was studied using the BOMD simulations.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Organization:
DOE Office of Science; USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1332623
Report Number(s):
PNNL-SA-113941; VT1201000
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 1 Vol. 18; ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English

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Cited By (22)

Molecular Dynamics of Lithium Ion Transport in a Model Solid Electrolyte Interphase preprint January 2018
Exploring Classes of Co-Solvents for Fast-Charging Lithium-Ion Cells journal January 2018
Improved lithium ion dynamics in crosslinked PMMA gel polymer electrolyte journal January 2019
Structure and polarization near the Li + ion in ethylene and propylene carbonates journal October 2017
In situ Raman investigation of electrolyte solutions in the vicinity of graphite negative electrodes journal January 2016
An ab initio molecular dynamics study of the solvation structure and ultrafast dynamics of lithium salts in organic carbonates: A comparison between linear and cyclic carbonates journal May 2019
Solvation behavior of carbonate-based electrolytes in sodium ion batteries journal January 2017
Lithium ion solvation by ethylene carbonates in lithium-ion battery electrolytes, revisited by density functional theory with the hybrid solvation model and free energy correction in solution journal January 2016
Spontaneous aggregation of lithium ion coordination polymers in fluorinated electrolytes for high-voltage batteries journal January 2016
Temperature and Concentration Dependence of the Ionic Transport Properties of Lithium-Ion Battery Electrolytes journal January 2019
Anion effects on the solvation structure and properties of imide lithium salt-based electrolytes journal January 2019
Structures and dynamic properties of the LiPF 6 electrolytic solution under electric fields – a theoretical study journal January 2019
Computer simulation study of the solvation of lithium ions in ternary mixed carbonate electrolytes: free energetics, dynamics, and ion transport journal January 2018
Ion Association Constants for Lithium Ion Battery Electrolytes from First-Principles Quantum Chemistry journal January 2019
Molecular Dynamics of Lithium Ion Transport in a Model Solid Electrolyte Interphase journal July 2018
Assessment of Simple Models for Molecular Simulation of Ethylene Carbonate and Propylene Carbonate as Solvents for Electrolyte Solutions book January 2018
Structure and dynamics in the lithium solvation shell of nonaqueous electrolytes journal April 2019
Assessment of Simple Models for Molecular Simulation of Ethylene Carbonate and Propylene Carbonate as Solvents for Electrolyte Solutions journal February 2018
All-temperature batteries enabled by fluorinated electrolytes with non-polar solvents journal October 2019
Dynamics and morphology of solid electrolyte interphase (SEI) journal January 2016
A theoretical study on Na + solvation in carbonate ester and ether solvents for sodium-ion batteries journal January 2020
Determination of Mass Transfer Parameters and Ionic Association of LiPF 6 : Organic Carbonates Solutions journal January 2017

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