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8790181 
Journal Article 
Conductivity of lithium bis(trifluoromethane)sulfonamide (LiTFSI) 
Ulihin, AS; Uvarov, NF; Gerasimov, KB 
2020 
1 
Materials Today: Proceedings
ISSN: 2214-7853 
31 
532-534 
WOS:000577459900018 
Thermal properties and conductivity of the lithium bis(trifluoromethane)sulfonamide (LiTSFI) were studied in a temperature range of 60-270 degrees C by differential scanning calorimetry (DSC) and impedance spectroscopy methods. As shown by DSC technique, at the first heating, three endothermic effects associated with dehydration, phase transition, and melting were observed On subsequent cooling and heating, only the thermal effect due to the ionic salt melting was observed. These data were confirmed by conductivity measurements. On cooling the LiTSFI sample from the molten state an abrupt decrease in the conductivity due to crystallization into the high-temperature gamma-phase was observed. Thus, according to the DSC and conductivity data, the high-temperature gamma-phase may be easily quenched down to room temperature. The parameters of Arrhenius dependence of conductivity for gamma-phase were estimated. It was shown that this phase has rather low ionic conductivity, below 10(-6) S/cm near the melting point and cannot be regarded as orientationally disordered phase. (C) 2020 Elsevier Ltd. All rights reserved. 
Lithium bis(trifluoromethane)sulfonamide; LiTFSI; Conductivity; Thermal properties; High-teperature phase