Physical and Electrolytic Properties of Fluoroethyl Methyl Carbonate
Open accessAbstract
The physical and electrolytic properties of the fluoroethyl methyl carbonate (FEMC) obtained chemically were examined. The dielectric constant, density and viscosity of FEMC were much higher than those of ethyl methyl carbonate (EMC). This means that the molecular interaction in FEMC becomes large with introducing a fluorine atom with high electron withdrawing into EMC molecule. The oxidative decomposition voltage (oxidation durability) of FEMC is slightly higher than that of EMC. At relatively low electrolyte concentrations, the specific conductivities in FEMC solutions are higher than those in EMC solutions because of high dielectric constant for FEMC. The conductivity in EC-FEMC binary solution decreases gradually with increasing FEMC concentration. The lithium electrode cycling efficiencies in EC-FEMC equimolar binary solutions containing 1.0 mol dm−3 LiPF6 and LiBF4 are higher than those in EC-EMC solutions. In particular, the LiBF4 solution shows the high efficiency of more than 70% at a high range of cycle number. The surface of the films formed on the electrode after cycling in EC-FEMC solutions is homogeneous, and consists of an uniform and small grain size.
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Fluorination can lead to higher viscosity; for example, at room temperature the viscosity of EMC and fluoroethyl methyl carbonate are 0.68 and 1.4 cP, respectively.
“Although fluorination can lead to higher viscosity (for example, at RT, the viscosity of EMC and fluoroethyl methyl carbonate are 0.68 and 1.4 cP, respectively [63]), the ionic conductivity is not always compromised since some fluorination may lead to higher dielectric constant.”
From Review on Low-Temperature Electrolytes for Lithium-Ion and Lithium Metal Batteries (2023) · cites this paper as [63]
The paper's Introduction states that FEMC has much higher viscosity than EMC, supporting the comparison used to illustrate fluorination's effect. The passages in our copy do not give the cited room-temperature values of 0.68 and 1.4 cP, so those figures cannot be verified. (LLM, conf=0.82)
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- Authors
- TAKEHARA, M., TSUKIMORI, N., NANBU, N., UE, M., & SASAKI, Y.
- Affiliations
- Tokyo Polytechnic University (JP)
- Mitsubishi Chemical Group Science and Technology Research Center (Japan) (JP)
- Venue
- Electrochemistry
- Publisher
- The Electrochemical Society of Japan
- Published
- 2003-12-05
- Volume
- 71
- Issue
- 12
- Pages
- 1201-1204
- ISSN
- 1344-3542 (ISSN-L)
- 2186-2451
- OpenAlex
- W2970736174
- Cited by
- 28
- References
- 0
- Citations by year
- 2025: 2 · 2024: 1 · 2023: 3 · 2022: 1 · 2021: 2 · 2019: 1 · 2015: 1 · 2014: 1 · 2013: 1 · 2012: 3
- FWCI
- 0.00
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Electrochemistry (publishedVersion)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advancements in Battery Materials
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced Battery Materials and Technologies
- Physical Sciences › Engineering › Automotive Engineering › Advanced Battery Technologies Research
- Keywords
- ethyl methyl carbonate, dielectric constant, density, viscosity, specific conductance, electrolyte solutions, lithium-ion battery electrolytes, LiPF6, lithium tetrafluoroborate, fluorinated solvents
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