SOLID POLYMER ELECTROLYTES BASED ON STATISTICAL POLY (ETHYLENE OXIDE-PROPYLENE OXIDE) COPOLYMERS

Introduction of a few oxy-propylene oxide units in the poly (ethylene oxide) chains prevents their recrystallization while keeping the good solvating properties of poly (ethylene oxide) towards lithium ions. Th ese materials have been synthesized by an original anionic copolymeriz ation process on solid catalysts at the LCPP. NMR characterization wil l be presented. Solid polymer electrolytes have been prepared with lit hium salts. Some of them have been obtained from these materials by ch anging the terminal OH groups into NH, groups and curing with diepoxid es. Crosslinking improves the mechanical properties but does not degra de the electrochemical properties which compare favorably with those o f similar solid polymer electrolytes prepared with pure poly (ethylene oxide) (PEO).