Polymers for electrochemical devices

International audiencePolymeric materials are already present in electrochemical storage devices such as batteries and PEM fuel cells. The polymer is an electro‐active material in lithium polymer batteries. Several network based polymer electrolytes provide thermal, mechanical and redox stabilities, while insuring a high conductivity level. Linear unsaturated polyether precursors may be obtained either by step‐growth polymerization from oligomeric polyethers, or by ring‐opening polymerization from oxirane mixtures. Some prototype performances, performed on a 10 Wh lithium polymer cell, are presented and discussed

Lithium organic salts with extra functionalities

International audienceLithium perfluorosulfonate salts have been tailored either to provide solvating and/or plasticizing effect, or polar function. Adding these extra functionalities to the organic anion result in a good combination of ionic conductivity and cationic transference number. The high cationic conductivity obtained for polymer electrolytes at the concentration O/Li=30 must be emphasized