LONG-TERM STABILITY OF PEO-LI2O-3B(2)O(3)-LICLO4 COMPOSITE SOLID-ELECTROLYTE

Poly(ethylene oxide) (PEO)-based composite solid electrolytes are of i nterest for their applications in solid-state electrochemical devices. In this paper we study both thermal and electrical stability of a PEO -Li2O:3B(2)O(3)(glass)-LiClO4 solid electrolyte vs a month-long ageing performed at room temperature under dry atmosphere. A comparison is p erformed with homologous films prepared from different solvents withou t the lithium triborate. We show that the composite electrolyte is the most amorphous one immediately, after preparation and better resists crystallization. The conductivity after three months ageing is well ab ove that of the reference films. Some anomalies have been found which are attributed to the glassy part of the composite. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.