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Title: Scaling Atomic Partial Charges of Carbonate Solvents for Lithium Ion Solvation and Diffusion

Journal Article · · Journal of Chemical Theory and Computation
 [1];  [2];  [3];  [4];  [4];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Politecnico di Torino, Turin (Italy)
  3. Tulane Univ., New Orleans, LA (United States)
  4. Texas A & M Univ., College Station, TX (United States)

Lithium-ion solvation and diffusion properties in ethylene carbonate (EC) and propylene carbonate (PC) were studied by molecular simulation, experiments, and electronic structure calculations. Studies carried out in water provide a reference for interpretation. Classical molecular dynamics simulation results are compared to ab initio molecular dynamics to assess nonpolarizable force field parameters for solvation structure of the carbonate solvents. Quasi-chemical theory (QCT) was adapted to take advantage of fourfold occupancy of the near-neighbor solvation structure observed in simulations and used to calculate solvation free energies. The computed free energy for transfer of Li+ to PC from water, based on electronic structure calculations with cluster-QCT, agrees with the experimental value. The simulation-based direct-QCT results with scaled partial charges agree with the electronic structure-based QCT values. The computed Li+/PF6- transference numbers of 0.35/0.65 (EC) and 0.31/0.69 (PC) agree well with NMR experimental values of 0.31/0.69 (EC) and 0.34/0.66 (PC) and similar values obtained here with impedance spectroscopy. These combined results demonstrate that solvent partial charges can be scaled in systems dominated by strong electrostatic interactions to achieve trends in ion solvation and transport properties that are comparable to ab initio and experimental results. Thus, the results support the use of scaled partial charges in simple, nonpolarizable force fields in future studies of these electrolyte solutions.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1339276
Report Number(s):
SAND-2017-0023J; 650174
Journal Information:
Journal of Chemical Theory and Computation, Vol. 12, Issue 12; ISSN 1549-9618
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

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Cited By (11)

Modelling Coupled Ion Motion in Electrolyte Solutions for Lithium‐Sulfur Batteries journal February 2019
Assessment of Simple Models for Molecular Simulation of Ethylene Carbonate and Propylene Carbonate as Solvents for Electrolyte Solutions journal February 2018
Quasi-chemical theory of F (aq): The “no split occupancies rule” revisited journal October 2017
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
Structure and polarization near the Li + ion in ethylene and propylene carbonates journal October 2017
Utility of chemical computations in predicting solution free energies of metal ions journal June 2017
Computer simulation study of the solvation of lithium ions in ternary mixed carbonate electrolytes: free energetics, dynamics, and ion transport journal January 2018
Structures and dynamic properties of the LiPF 6 electrolytic solution under electric fields – a theoretical study journal January 2019
Molecular Dynamics of Lithium Ion Transport in a Model Solid Electrolyte Interphase journal July 2018
Comparison of single-ion molecular dynamics in common solvents journal June 2018
Molecular Dynamics of Lithium Ion Transport in a Model Solid Electrolyte Interphase preprint January 2018

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