Shah, Deep B. published the artcileEffect of Anion Size on Conductivity and Transference Number of Perfluoroether Electrolytes with Lithium Salts, Application of 2,2′-((Perfluoroethane-1,2-diyl)bis(oxy))bis(2,2-difluoroethanol), the publication is Journal of the Electrochemical Society (2017), 164(14), A3511-A3517, database is CAplus.
Mixtures of perfluoropolyethers (PFPE) and Li salts with fluorinated anions are a new class of electrolytes for Li batteries. Unlike conventional electrolytes wherein electron-donating O groups interact primarily with the Li cations, the properties of PFPE-based electrolytes appear to be dependent on interactions between the fluorinated anions and the fluorinated backbones. We study these interactions by examining a family of Li salts wherein the size of the fluorinated anion is systematically increased: Li bis(fluorosulfonyl)imide (LiFSI), bis(trifluoromethanesulfonyl)imide (LiTFSI) salts and Li bis(pentafluoroethanesulfonyl)imide (LiBETI). Two short chain perfluoroethers (PFE), one with 3 repeat units, C6-DMC, and another with four repeat units, C8-DMC were studied; both systems have di-Me carbonate end groups. We find that LiFSI provides the highest conductivity in both C6-DMC and C8-DMC. These systems also present the lowest interfacial resistance against Li metal electrodes. The steady-state transference number (t+ss) was >0.6 for all of the electrolytes and was an increasing function of anion size. The product of conductivity and the steady-state transference number, a convenient measure of the efficacy of the electrolytes for Li battery applications, exhibited a maximum at ∼20 weight% salt in all electrolytes. Amongst the systems studied, LiFSI/PFE mixtures were the most efficacious electrolytes.
Journal of the Electrochemical Society published new progress about 129301-42-4. 129301-42-4 belongs to alcohols-buliding-blocks, auxiliary class Fluoride,Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2,2′-((Perfluoroethane-1,2-diyl)bis(oxy))bis(2,2-difluoroethanol), and the molecular formula is C15H21BO2, Application of 2,2′-((Perfluoroethane-1,2-diyl)bis(oxy))bis(2,2-difluoroethanol).
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