Solvation Effects on the Dielectric Constant of 1 M LiPF6 in Ethylene Carbonate: Ethyl Methyl Carbonate 3:7
[1];
[2];
[3]
- Department of Chemical Engineering Polytechnique Montreal Montreal QC H3T 1J4 Canada, Department of Materials Science and Engineering University of California Berkeley CA 94720 USA, Energy Technologies Area Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- Material, Physical and Chemical Sciences Center Sandia National Laboratories Albuquerque NM 87185 USA
- Department of Materials Science and Engineering University of California Berkeley CA 94720 USA, Energy Technologies Area Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
We report the dielectric constant of 1 M LiPF 6 in EC:EMC 3:7 w/w (ethylene carbonate/ethyl methyl carbonate) in addition to neat EC:EMC 3:7 w/w. Using three Debye relaxations, the static permittivity value, or dielectric constant, is extrapolated to 18.5, which is compared to 18.7 for the neat solvent mixture. The EC solvent is found to strongly coordinate with the Li + cations of the salt, which results in a loss of dielectric contribution to the electrolyte. However, the small amplitude and large uncertainty in relaxation frequency for EMC cloud definitive identification of the Li + solvation shell. Importantly, the loss of the free EC permittivity contribution due to Li + solvation is almost completely balanced by the positive contribution of the associated LiPF 6 salt, demonstrating that a significant quantity of dipolar ion pairs exists in 1 M LiPF 6 in EC:EMC 3:7.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)
- Grant/Contract Number:
- AC02-05CH11231; NA0003525
- OSTI ID:
- 1960071
- Journal Information:
- Energy & Environmental Materials, Journal Name: Energy & Environmental Materials Journal Issue: 1 Vol. 7; ISSN 2575-0356
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- China
- Language:
- English
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