The ionic radius of (CF3SO2C- was calculated to be 0.375 nm from its van der Waals volume, which was obtained by molecular mechanics calculations with the aid of its crystallogaphic data. This radius was correlated with its single ion limiting molar conductivity in propylene carbonate at 25 degrees C, and it was proven that this anion also nearly follows the behavior of perfect slip in Stokes law, as is observed for other popular anions for lithium battery applications.