Thermal Properties of Mixed Alkali Bis(trifluoromethylsulfonyl)amides

Abstract

Phase diagrams of binary mixtures of alkali bis(trifluoromethylsulfonyl)amides have been constructed and their eutectic compositions and temperatures have been determined. It has been revealed that the molten salt electrolytes having the melting points in the intermediate temperature range (373 to 473) K are easily formed by simple mixing of two kinds of single alkali bis(trifluoromethylsulfonyl)amides salts. The 1:1 or 3:1 double salt is occasionally formed for some binary systems.

Spectroscopic and Electrochemical Analyses for Neodymium Complexes in Potassium Bis(trifluoromethylsulfonyl)amide Melts

“…Therefore, the diffusion of the metallic cations in K[TFSA] melts needs the activation energy more than the dissociation energy with surrounding anions constituting the metal complexes. The value of E a,D is derived from the following Arrhenius rule: [10] where A * is the frequency factor, R the gas constant, and T the absolute temperature. − isomerism was evaluated from the van't Hoff plots from the temperature dependence of the Raman spectra.…”

Lithium salt with a super-delocalized perfluorinated sulfonimide anion as conducting salt for lithium-ion cells: Physicochemical and electrochemical properties

“…2a), which is characteristic of a plastic crystal. The T m (118 C) of Li[sTFSI] is much lower than that for LiTFSI (T m ¼ 233 C [62]). It seems that the super-delocalized charge distribution, flexible structure of eSO 2 eNeS(O)]NeSO 2 e, and asymmetric factor of the [sTFSI] À anion play a combinational role in reducing the lattice energy of Li[sTFSI], thus lowering the melting point.…”

Structural and Electrochemical Properties of Hard Carbon Negative Electrodes for Sodium Secondary Batteries Using the Na[FSA]–[C₃C₁pyrr][FSA] Ionic Liquid Electrolyte

“…[1][2][3][4][5][6][7][8][9][10][11] Sodium is abundant in the crust and seawater, showing a relatively low standard redox potential (¹2.71 V vs. SHE). Thus, batteries with low cost and high energy density can be constructed.…”

“…5,6 We have already reported that Na[TFSA]-Cs[TFSA] (TFSA = bis(trifluoromethylsulfonyl)amide) and Na[FSA]-K[FSA] (FSA = bis(fluorosulfonyl)amide) ionic liquids are promising electrolytes for sodium secondary batteries operating at an intermediate temperature range (>353 K). [1][2][3][4] However, these salts are solid at room temperature, while electrolytes with lower melting points are more desirable for the construction of batteries for a wide range of practical applications. Recently, we developed a new electrolyte, Na [FSA]-[C 3 C 1 pyrr][FSA] (C 3 C 1 pyrr = N-methyl-N-propylpyrrolidinium), that is a liquid in a wide temperature range, including room temperature.…”