In this work we report on the use of 0.3 M LiTFSI in PC-PYR14TFSI (50:50 wt.%) as electrolyte in lithium-ion batteries (LIBs). Conductivity, viscosity and electrochemical stability of this electrolyte were investigated and compared with those of the electrolytes 1 M LiPF6 in PC and 0.3 M LiTFSI in PC. The thermal stability of these electrolytes at 60 degrees C was also investigated. LIBs containing LTO as anode and LFP as cathode were assembled and tested in the three electrolytes at room temperature and 60 degrees C. The results of these tests show that the use of 0.3 M LiTFSI in PC-PYR14TFSI (50:50 wt.%) allows the realization of LIBs able to deliver high capacity and to display high cycling stability at both temperatures. (C) 2012 Elsevier Ltd. All rights reserved.