The ionic liquid (IL) N-Methyl-N-methoxymethylpyrrolidinium bis(fluorosulfonyl)amide ([Pyr(1,101)][FSA]) was synthesized, and its physicochemical and electrochemical properties were investigated with respect to its application as an electrolyte in lithium-ion secondary batteries operating over a wide temperature range. [Pyr(1,101)][FSA]/Li salt (0.34 mol kg) composites were prepared by adding lithium bis(tri-fluoromethylsulfonyl)amide (LiTFSA) into the IL. [Pyr(1,101)][FSA] and [Pyr(1,101)][FSA]/LiTFSA exhibited melting temperatures (T-m) below 30 degrees C. [Pyr(1,101)][FSA] exhibited a higher ionic conductivity value as compared with that of the corresponding IL with only alkyl substituents. The electrochemical window for both [Pyr(1,101)][FSA] and [Pyr(1,101)][FSA]/LiTFSA was 5.1 V. Stable lithium deposition and dissolution occurred on a Ni electrode at 25 degrees C. (C) 2016 Elsevier B.V. All rights reserved.