Solid, polymeric, polyether based electrolyte

Solid, polymeric electrolyte, comprising a solid solution of an ionic compound in a solid, crosslinked polymeric matrix of polyether, characterized in that said polymeric electrolyte is prepared by:

• 1) preparing a mixture containing:
• (a) a macromer of formula (I) ##STR8## wherein R is methyl or ethyl,
• n is an integer within the range of from 2 to 20,
• x is an integer within the range of from 2 to 5;
• (b) a difunctional comonomer of formula (II) CH.sub.2 .dbd.C(CH.sub.3)COO(CH.sub.2 CH.sub.2 O).sub.m --CO--(CH.sub.3)C.dbd.CH.sub.2 wherein m is an integer within the range of from 2 to 5;
• with a molar ratio of the macromer (I) to the difunctional comonomer (II) within the range of from 98:2 to 60:40;
• (c) an ionic compound in an amount within the range of from 1 to 30% by weight;
• (d) an oligomer or a dipolar aprotic liquid in an amount within the range of from 0 to 80% by weight;
• (e) a photoinitiator in an amount within the range of from 0 to 10% by weight;
• (2) applying the above mixture on an inert support and exposing it to a source of ultraviolet light, thermal radiation, or electron beam, with the amount of the component (e) present in the mixture being larger than zero only in the case of exposure to ultraviolet light.