Gel electrolytes and electrodes

A gel electrolyte comprising components a) to c) with

• a) at least one layer of at least one polymer comprising polymerized units of a1) and a2)
• a1) at least one monomer containing i) an ethylenically unsaturated unit and ii) an amido group, wherein a carbon atom of the amido group is linked via a chemical bond to one of a carbon atom of the ethylenically unsaturated unit, and
• a2) at least one crosslinker containing i) at least two ethylenically unsaturated units and ii) a spacer with at least two carbon atoms, wherein two of the ethylenically unsaturated units are linked together via the spacer;
• b) at least one conducting salt;
• c) at least one solvent,
• wherein monomer a2) is selected from a compound as in formula (II)
• where
• K is —C(O)-L-C(O)—;
• L is —NH—(CH2)p—O—(CH2—CH2—O)m—(CH2)p—NH—, —NH—(CH2—CH2—O)m—CH2—CH2—NH— or —NH—(CHR6—CH2—O)m—(CH2—CH2—O)n—(CH2—CHR11—O)o—CH2—CHR14—NH—;
• R3 and R12 are each H;
• R6, R11 and R14 are each methyl;
• m and o are each independently an integer from 2 to 5;
• n is an integer from 7 to 10;
• and
• p is an integer from 1 to 3.