ELECTROCHEMICAL-BEHAVIOR OF LITHIUM ELECTROLYTES BASED ON NEW POLYETHER NETWORKS

New polyethers have been prepared from polycondensation between severa l alpha,omega-dihydroxy(oxyethylene) and 3-chloro-2-chloromethyl-1-pro pene (CCMP). The CCMP units decrease both the crystallinity content an d the melting point of the polyether chains. The free-radical polymeri zation of the dangling double bonds decreases the melting point of the crystalline phase and greatly enhances the mechanical strength of the network. The conductivity as well as the thermal behavior and the ele ctrochemical stability of lithium electrolytes based on these networks have been investigated. Conductivity values close to 10(-5) S . cm-1 at 200-degrees-C were obtained for some salt concentrations without co mpromising the electrochemical stability. A transport number t+ = 0.46 has been determined for LiTFSI/network complexes.