Patent ID: 7560194

Claim:
A gel polymer electrolyte precursor composition for use in the fabrication of a secondary battery cell, which comprises: a) a modified bismaleimide oligomer resulting from a reaction of barbituric acid with bismaleimide; b) one or more acrylic/acrylate type monomer represented by CH 2 ═C(R 0 )C(O)O—(C y H 2y O) m R 1 , wherein y=1˜3, m=0˜9′ R 0 is hydrogen or methyl, R 1 is selected from the group consisting of hydrogen, hydroxyl, C1-C6 alkyl, C1-C6 alkoxyl, C2-C6 alkenyl, C3-C6 cycloalkyl and phenyl; one or more nitrile type monomer represented by R 2 —CH═C(R 0 )(CN), wherein R 0 has the same definition as the above, R 2 is selected from the group consisting of hydrogen, hydroxyl, C1-C6 alkyl, C1-C6 alkoxyl, C2-C6 alkenyl, C3-C6 cycloalkyl and phenyl; or an oligomer thereof; c) a non-aqueous metal salt electrolyte; d) an aprotic solvent; and e) a free radical initiator; wherein, based on the total weight of (a) to (d), (a) constitutes 1-50%; (b) constitutes 1-50%; and (d) constitutes 10-90%, wherein (c) has a concentration of 0.5M to 2M in (d); and (e) is in an amount of 0.1-5%, based on the weight of (b).