- Synthesis, characterization, and ion-conductive behavior in an organic solvent and in a polyether of a novel lithium salt of a perfluorinated polyimide anion
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To achieve highly conductive polymer electrolytes with a controllable ionic transference number, a novel polymeric lithium salt was synthesized and characterized. The novel lithium salt of a perfluorinated polyimide anion, poly(5-oxo-3-oxy-4-trifluoromethyl-1,2,4-pentafluoropentylene sulfonylimide lithium) (LiPPI), has a polyanionic backbone with a repeating unit resembling highly dissociable, thermally and electrochemically stable imide salts, such as lithium bis(trifluoromethylsulfonyl)imide (LiTFSI). The ion-conductive behavior of LiPPI in an organic solvent and in a polyether was extensively studied by using pulse-gradient spin-echo NMR, in addition to differential scanning calorimetry, complex impedance measurement, and dynamic mechanical analysis. Solutions of LiPPI in ethylene carbonate (EC) exhibited a high degree of dissociation and high ionic conductivity, and the self-diffusion coefficient of the anion was lower than that of the cation. Solvent-free polymer electrolytes were prepared by dissolving LiPPI in a matrix polyether to afford a compatible polymer alloy, and the ionic conductivity of the new polymer alloy electrolytes reached ca. 10-5S cm-1 at 30°C. Although the lithium ionic transference number in the organic electrolyte solution was approximately the same as that of LiTFSI in EC, the polymer alloy electrolyte gave an apparent transference number higher than 0.7, which was considerably higher than that of LiTFSI in the same polyether.
- Tokuda, Hiroyuki,Muto, Shunsuke,Hoshi, Nobuto,Minakata, Takashi,Ikeda, Masanori,Yamamoto, Fumihiko,Watanabe, Masayoshi
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- PROCESS FOR PRODUCTION OF FLUORINATED SULFONYL FLUORIDES
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The present invention provides a process for producing a fluorinated sulfonyl fluoride useful as e.g. a material for an ion exchange resin, and a novel chemical substance useful as an intermediate in the production process. That is, to provide a process comprising oxidizing Y-S-RA-E-RB by means of an oxidizing agent essentially containing a halogen atom to obtain XSO2-RA-E-RB, and in a case that X is a fluorine atom, reacting the compound with fluorine in a liquid phase as it is, and in a case that X is a halogen atom other than a fluorine atom, converting X into a fluorine atom, and then reacting the obtained compound with fluorine in a liquid phase to obtain FSO2-RAF-EF-RBF, and then decomposing it to obtain FSO2-RAF-COF (wherein RA is a bivalent organic group such as an alkylene group, RB is a monovalent organic group such as a perfluoroalkyl group, E is -CH2OCO-, Y is a monovalent organic group such as a cyano group or the like, X is a halogen atom, RAF is a bivalent organic group having RA fluorinated or the like, RBF is the same group as RB or the like, and EF is -CF2OCO-).
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Page/Page column 19
(2008/06/13)
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- PROCESS FOR THE PRODUCTION OF WATER-SOLUBLE FLUORINE -CONTAINING VINYL ETHERS
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The present invention relates to a method for producing a water-soluble fluorine-containing vinyl ether which comprises subjecting a fluorine-containing 2-alkoxypropionic acid derivative represented by the following general formula (I): (wherein A represents -OM1 or -OM21/2, and M1 represents an alkali metal and M2 represents an alkaline earth metal; X represents a halogen atom; Y1 and Y2 are the same or different and each represents a fluorine atom, a chlorine atom, a perfluoroalkyl group or a fluorochloroalkyl group; n represents an integer of 0 to 3, and n of Y1s may be the same or different; m represents an integer of 1 to 5, and m of Y2s are the same or different; and Z represents a hydrophilic group) to thermal decomposition at a temperature of not lower than 50°C but lower than 170°C in the presence of a coordinating organic solvent to give a water-soluble fluorine-containing vinyl ether represented by the general formula (II): (wherein Y1, Y2, Z, n and m are as defined above),???said coordinating organic solvent having a coordinating property with an ion of said M1 or an ion of said M2???said coordinating organic solvent being in an amount of 10 to 1,000 parts by mass per 100 parts by mass of the fluorine-containing 2-alkoxypropionic acid derivative.
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Page/Page column 8
(2008/06/13)
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- Synthesis of 3,6-dioxa-δ7-4-trifluoromethyl sulfonimide: Bis[(perfluoroalkyl)sulfonyl] superacid monomer and polymer
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A new type of ion exchange polymer, bis[(perfluoroalkyl)sulfonyl]imide ionomers (PFSI), were developed by the copolymerization of sodium 3,6-dioxa-Δ7-4-trifluoromethyl perfluorooctyl trifluoromethyl sulfonimide with tetrafluoroethylene (TFE) using an aqueous redox initiation system in an emulsion type polymerization. These polymers have been prepared in various equivalent weights and processed into functional membranes. The new ionomers exhibit excellent chemical and thermal stability. The materials have high potential for electrochemical applications especially as solid polymer electrolytes (SPE) in proton exchange membrane (PEM) fuel cells.
- Thomas, Brian H.,Shafer, Gregory,Ma, Jing Ji,Tu, Ming-Hu,DesMarteau, Darryl D.
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p. 1231 - 1240
(2007/10/03)
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