Method of manufacturing lithium secondary battery

A method of manufacturing a stacked lithium secondary battery comprising the steps of:

• mixing a polymer mixture including a) polyvinylidene fluoride-based polymer and b) at least one polymer selected from the group consisting of polyacrylonitrile and polymethyl methacrylate with a solvent in which a lithium salt is dissolved, said polymer mixture and said solvent being mixed in a mixing ratio of about 1:3-10;
• heating thus obtained first mixture to obtain a polymer electrolyte composition;
• coating thus obtained polymer electrolyte composition on a first surface of a first electrode which includes the first surface and a second surface and is one of an anode and a cathode, and then drying to obtain a polymer electrolyte layer;
• coating said polymer electrolyte composition on the second surface of said first electrode;
• attaching a second electrode which is a remaining one of said anode and cathode with said polymer electrolyte layer to obtain a unit cell;
• stacking a plurality of said unit cells to obtain a multi-layered cell;
• impregnating said multi-layered cell with a predetermined amount of a liquid electrolyte;
• and
• packaging thus obtained multi-layered cell.

A method of manufacturing a wound lithium secondary battery comprising the steps of:

• mixing a polymer mixture including a) polyvinylidene fluoride-based polymer and b) at least one polymer selected from the group consisting of polyacrylonitrile and polymethyl methacrylate with a solvent in which a lithium salt is dissolved, said polymer mixture and said solvent being mixed in a mixing ratio of about 1:3-10;
• heating thus obtained first mixture to obtain a polymer electrolyte composition;
• coating thus obtained polymer electrolyte composition on a first surface of a first electrode which includes the first surface and a second surface and is one of an anode and a cathode, and then drying to obtain a polymer electrolyte layer;
• coating said polymer electrolyte composition on the second surface of said first electrode;
• attaching a second electrode which is a remaining one of said anode and cathode with said polymer electrolyte layer and then winding;
• impregnating said winding cell with a predetermined amount of a liquid electrolyte;
• and
• sealing thus obtained winding cell.