Lithium redox behavior in N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulphonyl)imide room temperature ionic liquid

► Paper reports value of the exchange current density for Li|SEI|Li+ system. ► Data are obtained in three ways: simulation, EIS measurements and Tafel plot. ► Data are obtained for a solvent-free ionic liquid, without desolvation process. ► Data are important for research on primary and secondary Li and C6Li anodes.