Patent ID: 7238444

Claim:
A lithium secondary battery comprising an anode for lithium batteries, a cathode containing lithium or capable of inclusion and release of lithium, and an ion-conductive polymer layer sandwiched between the cathode and the anode, wherein said ion-conductive layer is a laminate of two sub-layers each comprising a matrix of said ion-conductive polymer retaining a non-aqueous electrolyte solution therein, wherein said ion-conductive polymer is a homo- or copolymer of polyether polyol poly(meth)acrylate including an ethylene oxide unit and optionally a propylene oxide unit in the polyether chain, and wherein said sub-layers are integral with the respective electrodes and said nonaqueous electrolyte solution contains a lithium salt dissolved in an organic solvent, and wherein the concentration of said lithium salt is higher in said non-aqueous electrolyte solution retained in the sub-layer on the cathode side than in said non-aqueous electrolyte solution retained in the sub-layer on the anode side.