Synthesis and characterization of partially fluorinated ethers

Zaggia, Alessandro; Conte, L.; Padoan, Gennifer; Ceretta, Flavio

doi:10.1016/j.jfluchem.2010.04.003

Cited by 8 publications

(6 citation statements)

References 22 publications

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“…These molecules are synthesized following modified approaches from literature. The detailed synthesis procedure and (Fan et al, 2018) H NMR chemical shifts can be found in the supporting information (Zaggia et al, 2010). Both molecules possess the designed bi-functional structure but with different chain lengths.…”

Section: Micelle Formation In the Electrolytesmentioning

confidence: 99%

A Micelle Electrolyte Enabled by Fluorinated Ether Additives for Polysulfide Suppression and Li Metal Stabilization in Li-S Battery

et al. 2020

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The Li-S battery is a promising next-generation technology due to its high theoretical energy density (2600 Wh kg −1) and low active material cost. However, poor cycling stability and coulombic efficiency caused by polysulfide dissolution have proven to be major obstacles for a practical Li-S battery implementation. In this work, we develop a novel strategy to suppress polysulfide dissolution using hydrofluoroethers (HFEs) with bi-functional, amphiphlic surfactant-like design: a polar lithiophilic "head" attached to a fluorinated lithiophobic "tail." A unique solvation mechanism is proposed for these solvents whereby dissociated lithium ions are readily coordinated with lithiophilic "head" to induce self-assembly into micelle-like complex structures. Complex formation is verified experimentally by changing the additive structure and concentration using small angle X-ray scattering (SAXS). These HFE-based electrolytes are found to prevent polysulfide dissolution and to have excellent chemical compatibility with lithium metal: Li||Cu stripping/plating tests reveal high coulombic efficiency (>99.5%), modest polarization, and smooth surface morphology of the uniformly deposited lithium. Li-S cells are demonstrated with 1395 mAh g −1 initial capacity and 71.9% retention over 100 cycles at >99.5% efficiency-evidence that the micelle structure of the amphiphilic additives in HFEs can prohibit polysulfide dissolution while enabling facile Li + transport and anode passivation.

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Section: Micelle Formation In the Electrolytesmentioning

confidence: 99%

A Micelle Electrolyte Enabled by Fluorinated Ether Additives for Polysulfide Suppression and Li Metal Stabilization in Li-S Battery

et al. 2020

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“…The effectiveness of this type of methodology has been used in a recent publication by Zaggia et al . to yield semi-fluorinated ethers from fluorotelomer alcohols and bromoalkanes in aqueous KOH in good to excellent yields (60 – 97 %) [19]. …”

Section: Discussionmentioning

confidence: 99%

Base-induced instability of fluorotelomer alcohols

Tucker

Mecozzi

2013

Journal of Fluorine Chemistry

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The stability of fluorotelomer alcohols under basic conditions was studied. HF elimination across the CF2-CH2 junction is shown to be facilitated by an intramolecular hydrogen bond, while solvation is the key determinant in the stability of alcohols of various perfluoroalkyl lengths. Finally, fluorotelomer alcohols can be rendered kinetically stable if either the alcohol or the base has low solubility in the reaction medium.

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“…112) But all these results suggest that the LHR can give only limited information on the affinity of the wetting medium with the powder and cannot be used as a general guide for the selection of the proper wetting fluid, which confirm that Washburn's method is extremely sensitive to the choice of the reference liquid used. They used three surfactant solutions to be the reference liquids in the Washburn method according to literature 113) and obtained curves of w 2 versus time as shown in Fig. 30.…”

Section: Contact Anglesmentioning

confidence: 99%

Measurement for Contact Angle of Iron Ore Particles and Water

Tang

et al. 2018

ISIJ Int.

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Contact angle, as a key index for the wettability of iron ore particles by water, is of very important for the iron ore processing like beneficiation, sintering and pelletizing.Methods developed for measuring the contact angles generally can be divided into direct and indirect methods, which were summarized in present study and their advantages and disadvantages are all compared. Capillary rise method may be the most applicative approach for porous particles.Most of the contact angles between iron ore particles with water reported in the literatures were collected and the influence of the physical and chemical properties of iron ore particles were analyzed. The result shows that iron ore particles are hydrophilic and its water contact angles are influenced by the complicate interaction of chemical compositions, especially the content of oxy-hydroxides and the surface morphology. Generally, the water contact angle of goethite is the smallest. Complicate surface morphology suggest a better wettability. Furthermore, the penetration behavior of natural iron ore particles and synthetic iron ore particles are obviously different during the contact angle measurement. Compared with sessile drop method, capillary rise methods are more suitable for the measurement of natural iron oxides. Some empirical equations to predict the contact angle were collected and compared. The wettability can be improved by increasing the surface morphology of particles, coating of iron ore particles, and hightemperature treatment.

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Synthesis and characterization of partially fluorinated ethers

Cited by 8 publications

References 22 publications

A Micelle Electrolyte Enabled by Fluorinated Ether Additives for Polysulfide Suppression and Li Metal Stabilization in Li-S Battery

A Micelle Electrolyte Enabled by Fluorinated Ether Additives for Polysulfide Suppression and Li Metal Stabilization in Li-S Battery

Base-induced instability of fluorotelomer alcohols

Measurement for Contact Angle of Iron Ore Particles and Water

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