lithium bis(trifluoromethane)sulfonamide LiTFSI电导率

Thermal properties and conductivity of the lithium bis(trifluoromethane)sulfonamide (LiTSFI) were studied in a temperature range of 60–270 °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 γ-phase was observed. Thus, according to the DSC and conductivity data, the high-temperature γ-phase may be easily quenched down to room temperature. The parameters of Arrhenius dependence of conductivity for γ-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.

通过差示扫描量热法（DSC）和阻抗谱法研究了双（三氟甲烷）磺酰胺锂（LiTSFI）在60–270 °C温度范围内的热性能和电导率。如DSC技术所示，在第一次加热时，观察到与脱水、相变和熔融相关的三种吸热效应，在随后的冷却和加热中，仅观察到离子盐熔化引起的热效应。这些数据通过电导率测量得到证实。在将LiTSFI样品从熔融状态冷却时，观察到由于结晶到高温γ相中，电导率突然下降。因此，根据DSC和电导率数据，高温γ相可以很容易地淬火到室温。估计了γ相电导率的阿伦尼乌斯依赖性参数。结果表明，该相具有相当低的离子电导率，在熔融点附近低于10-6 S/cm