NEW LITHIUM-BASED POLYETHYLENE OXIDE-GLASS SOLID ELECTROLYTES

A large-scale use of polymeric solid electrolytes in electrochemical d evices calls for new materials with high conductivity, thermal and ele ctrical stability over charge-discharge cycles, good mechanical proper ties, compatibility with the electrodes, high current densities. Modem preparation techniques like sol-gel allow us to explore new classes o f composite materials like glass-polymers. We present sol-gel synthesi s, electrical and thermal characterization of a new solid electrolyte based on a matrix made with poly(ethylene oxide) and glassy lithium tr iborate, which has been doped with lithium salts. We obtained a conduc tivity at room temperature similar to 10(-5) ohm(-1)cm(-1), which allo ws us to envisage some useful technological applications in electroche mical devices.