Patent ID: 8603682

Claim:
A secondary battery comprising (i) a cathode; (ii) an anode; (iii) a separator; and (iv) a gel polymer electrolyte composition comprising an electrolyte solvent, an electrolyte salt, and a polymerizable monomer, wherein the gel polymer electrolyte composition does not include a polymerization initiator, and wherein the separator consists essentially of a porous material of polyolefin, having a polymerization initiator coating thereon, wherein the polymerization initiator coating includes a compound selected from the group consisting of benzoyl peroxide, acetyl peroxide, dilauryl peroxide, di-tert-butyl peroxide, t-butyl peroxy-2-ethylhexanoate, cumyl hydroperoxide, 2,2′-azobis(2-cyanobutane), 2,2′-azobis(methylbutyronitrile), 2,2′-azobis(iso-butyronitrile), 2,2′-azobisdimethyl-valeronitrile, and mixtures thereof, wherein gelation of the gel polymer electrolyte composition through a polymerization is completely carried out within a range of about 10 minutes to 4 hours.