Measurement of diffusion coefficients of radical in silicon ionic liquids by transient grating method

离子液体(ILS)具有许多有趣的性质，如低蒸汽压、高电导率、化学稳定性。由于这些独特的性质，离子液体可以克服有机溶剂的缺点，如高蒸汽压和易燃性。因此，它作为锂离子电池的电解液备受关注。然而，由于离子液体的粘度高于有机溶剂，分子在离子液体中的扩散通常是缓慢的。另一方面，有报道称，在相同粘度的有机溶剂中，硅油中的分子扩散比在有机溶剂中的扩散要大。因此，我们预计硅氧烷官能团可能会提高分子扩散速度。我们目前的目的是分析适用于电化学装置的硅离子液体(SiILs)的输运性质。为了测量SiILs中的扩散系数，我们采用了暂态光栅法。

Ionic liquids (ILs) have various interesting properties, for example, low vapor pressure, high electrical conductivity, chemical stability. Due to these unique properties, ILs can overcome the drawback of organic solvents such as high vapor pressure and flammability. Therefore it is attracted much attention as an electrolysis solution in Li ion battery. However it is known that molecular diffusion in IL is generally slow, because viscosities of ILs are higher than that of organic solvent. On the other hand, it has been reported that molecular diffusion in silicone oil is higher than that in organic solvents with the same viscosity. Therefore we expected that siloxane fanctional group may improve the rate of molecular diffusion. Our present purpose is analysis of transport property in silicone ionic liquids (SiILs) which is applicable to electrochemical devices. We applied the transient grating (TG) method in order to determine diffusion coefficients in SiILs.