The synthesis of a new lithium conducting oligomer ionic liquid (IL), noted Jeffamine diLi, was obtained from a two-step grafting of bis(trifluoromethanesulfonyl) imide on the commercial diamine-telechelic poly (propylene oxide)-block-poly (ethylene oxide)-block-poly (propylene oxide) (PPO-PEO-PPO). This oligomer IL, with a conductivity of 4.8 x 10(-3) S cm(-1) at 100 degrees C, is liquid from -21 degrees C and stable up to 300 degrees C. An all-solid-electrochromic device using Jeffamine diLi as electrolyte was successfully fabricated. Then, two types of polymer network were selected to develop the lithium conducting materials. Jeffamine diLi was incorporated either in a poly (ethylene oxide) (PEO) or in a PPO-PEO-PPO network. The resulting semi-interpenetrating networks (semi-IPNs) are transparent, amorphous, self-standing and have ionic conductivity of 1.10(-4) S cm(-1) at 80 degrees C. The diffusion and relaxation NMR measurements paint a picture of the cations being much more strongly interacting with the anions of the IL in the PPO-PEO-PPO semi-IPN's than in the PEO semi-IPN's. (C) 2018 Elsevier Ltd. All rights reserved.