Battery having electrode made of polymeric compound having conjugated double bonds

A battery comprising as at least one electrode a polymeric compound having conjugated double bonds in the main chain, and an electrolytic solution comprising an organic solvent and an electrolyte therein, said organic solvent being at least one member selected from the group consisting of nitrile compounds represented by the following general formulae (I) and (II):

• R--CN (I)
• wherein R stands for an alkyl group having 2 to 7 carbon atoms, a saturated alicyclic hydrocarbon residue having 3 to 7 carbon atoms or a group CH.sub.3 --(CH.sub.2).sub.x --O--(CH.sub.2 --)--.sub.y or NC--(CH.sub.2 --)--.sub.z in which x, y and z stand for 0 or a positive integer of up to 5, and ##STR12## wherein R.sub.1 stands for a group --(CH.sub.2).sub.p --CN, --O--(CH.sub.2).sub.q --CN or ##STR13## in which R.sub.3 stands for an alkyl group having up to 5 carbon atoms and p, q and r stand for 0 or a positive integer of up to 5, R.sub.2 stands for an alkyl or alkoxy group having up to 5 carbon atoms or a group --(--CH.sub.2).sub.l --CN, in which l stands for 0 or a positive integer of up to 3, m is a positive integer of up to 3, and n is 0 or a positive integer of up to 3.