Conductivity and Viscosity of Solutions of LiCF3 SO 3, Li ( CF 3 SO 2 ) 2 N , and Their Mixtures

Abstract

The high level of charge delocalization of the anion reduces ion pairing in nonaqueous electrolytes. This overrides the higher viscosity of the imide‐containing solutions making the electrolytes much more conductive than those containing , especially in low dielectric ether‐based solvent systems commonly used in secondary lithium batteries. In more viscous solvent systems (1:1 propylene carbonate: 1,2‐dimethoxyethane) or at low temperatures, the imide affords less of an advantage in conductivity due to the more important role of viscosity. The cyclic imide gives more viscous and less conductive solutions than does . The degree of dissociation in 1:1 PC:DME appears to be