EI-0010 (OTTO) 1-Ethyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 99% Cas 223436-99-5 - used in dye-sensitized solar cells (DSSCs). EI-0010 (OTTO) 1-Ethyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 99% Cas 223436-99-5 - used in the fabrication of lithium-ion batteries. Lithium-ion batteries consist of anode, cathode, and electrolyte with a charge-discharge cycle.