Due to the excellent dissolving properties of ILs, they can be modified into hybrid electrolytes, either with lithium salts and/or organic solvents, which can effectively reduce the viscosity and ionic transferring resistance, which thereby improves the ion transport and interfacial properties of battery electrolytes . One approach is to add a Li-salt with a different anion than in the IL . For example, replacing [TFSI] -by [FSI] -, or combining the two, has been motivated by enhanced ionic conductivities and improved passivation of the aluminium current collector . Several IL based electrolytes with an imidazolium cation (EMI) have been investigated trying to find beneficial effect of mixing [FSI] -with