Fluorinated organic solvents in electrolytes for lithium ion cells

Möller, Kai-Christian; Hodal, Tomas; Appel, Wolfgang K.; Winter, Martin; Besenhard, Jürgen

doi:10.1016/s0378-7753(01)00537-7

Cited by 130 publications

(83 citation statements)

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“…[31,32] Ac ommon drawback is certainly their increased viscosities,w hichl ead to lower ionic conductivities. [29] Nevertheless, FEC is now frequently present as an electrolyte additive in commercial lithium-ion cells.…”

Section: Alternative Organic Electrolyte Solventsmentioning

confidence: 99%

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

et al. 2015

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Lithium-ion batteries are becoming increasingly important for electrifying the modern transportation system and, thus, hold the promise to enable sustainable mobility in the future. However, their large-scale application is hindered by severe safety concerns when the cells are exposed to mechanical, thermal, or electrical abuse conditions. These safety issues are intrinsically related to their superior energy density, combined with the (present) utilization of highly volatile and flammable organic-solvent-based electrolytes. Herein, state-of-the-art electrolyte systems and potential alternatives are briefly surveyed, with a particular focus on their (inherent) safety characteristics. The challenges, which so far prevent the widespread replacement of organic carbonate-based electrolytes with LiPF6 as the conducting salt, are also reviewed herein. Starting from rather "facile" electrolyte modifications by (partially) replacing the organic solvent or lithium salt and/or the addition of functional electrolyte additives, conceptually new electrolyte systems, including ionic liquids, solvent-free, and/or gelled polymer-based electrolytes, as well as solid-state electrolytes, are also considered. Indeed, the opportunities for designing new electrolytes appear to be almost infinite, which certainly complicates strict classification of such systems and a fundamental understanding of their properties. Nevertheless, these innumerable opportunities also provide a great chance of developing highly functionalized, new electrolyte systems, which may overcome the afore-mentioned safety concerns, while also offering enhanced mechanical, thermal, physicochemical, and electrochemical performance.

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Section: Alternative Organic Electrolyte Solventsmentioning

confidence: 99%

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

et al. 2015

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“…Mixtures of different linear and cyclic organic carbonates serve as solvents. DMC, EMC, DEC and EC are commonly used [3,4]. Apart from various electrolyte additives [5,6], the electrolyte in commercial available LIBs usually contains LiPF 6 as conducting salt.…”

Section: Introductionmentioning

confidence: 99%

Supercritical carbon dioxide extraction of lithium-ion battery electrolytes

Grützke

Kraft

Weber

et al. 2014

The Journal of Supercritical Fluids

107

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“…The kinematic viscosity may more clearly reflect the magnitude of the attractive forces between molecules. The kinematic viscosity of ETFEE was as low as that of DEE above 323 K. 1-(2,2,2-Trifluoroethoxy)-2-methoxyethane 7 and N,N-dimethyl trifluoroacetamide 10 also show low kinematic viscosities. The temperature dependency of kinematic viscosity of FETFEE was larger than that for the other solvents.…”

Section: ¹1mentioning

confidence: 86%

Physical and Electrochemical Properties of Fluorinated Dialkyl Ethers

et al. 2016

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Dialkyl ethers show high relative permittivities and low viscosities as compared to the corresponding linear carbonates. We have synthesized 1-(2-fluoroethoxy)-2-(2,2,2-trifluoroethoxy)ethane (FETFEE). The relative permittivity and viscosity of FETFEE were higher than those of 1,2-diethoxyethane (DEE, ethylene glycol diethyl ether). The conductivity of 1 mol dm −3 LiPF 6 solution in FETFEE was higher than that in 1-ethoxy-2-(2,2,2-trifluoroethoxy)ethane (ETFEE). The use of FETFEE as a co-solvent improved the discharge capacity of a Li | LiCoO 2 coin cell.

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Fluorinated organic solvents in electrolytes for lithium ion cells

Cited by 130 publications

References 0 publications

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

Safer Electrolytes for Lithium‐Ion Batteries: State of the Art and Perspectives

Supercritical carbon dioxide extraction of lithium-ion battery electrolytes

Physical and Electrochemical Properties of Fluorinated Dialkyl Ethers

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