Patent ID: 7192675
Filing Date: 2007-03-20
Classification: H01M,Y02E

Abstract:
1. A lithium secondary battery comprising an anode having an electroactive substance comprised of a carbonaceous substance capable of electrochemically inclusion and release of lithium, a cathode having an electroactive substance comprised of a chalcogenide compound containing lithium, and a polymer gel electrolyte layer sandwiched between the cathode and the anode, wherein said polymer gel electrolyte layer comprises a matrix of an ion-conductive polymer of polyether polyol (meth)acrylate retaining a nonaqueous electrolyte solution therein, wherein said polymer gel electrolyte layer is divided into a first sub-layer integrally formed with said cathode and a second sub-layer integrally formed with said anode, and wherein the precursor monomer of said ion-conductive polymer in said first sub-layer has a polymerizable functionality of 3, and the precursor monomer of said ion-conductive polymer in said second sub-layer has a polymerizable functionality less than 3, the precursor monomer of said ion-conductive polymer in said first sub-layer being a trihydric polyether polyol triacrylate and the precursor monomer of said ion-conductive polymer in said second sub-layer being a mixture of said trihydric polyether polymer triacrylate with triethylene glycol monomethyl ether acrylate at a weight ratio of 1:1.