The properties of the binary salt system based on mixtures of methyl ethyl pyrrolidinium bis(trifluoromethane sulfonyl) imide (P-12) and lithium bis(trifluoromethane sulfonyl) imide (Li imide) are repor ted. The lithium containing mixtures were found to be more than two orders of magnitude more conductive than the parent P-12 phase and the 33 mol% Li imide systems showed a solid state conductivity around 1 X 10(-4) S/cm at 20 degreesC. This solid state conductivity is believed to take place in plastic crystal phases of the P-12 compound.