Claims
- 1. A method of manufacturing a 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 electrode which is one of an anode and a cathode, and then drying to obtain a polymer electrolyte layer; and attaching a second electrode which is a remaining one of said anode and cathode onto said polymer electrolyte layer.
- 2. A method of manufacturing a lithium secondary battery as claimed in claim 1, wherein said drying is implemented at a temperature range of from room temperature −60° C. for a time period of 1 minute-1 hour.
- 3. A method of manufacturing a lithium secondary battery as claimed in claim 1, wherein said polymer electrolyte composition is coated on said first electrode to a thickness range of 20-100 μm.
- 4. A method of manufacturing a lithium secondary battery as claimed in claim 1, wherein said first electrode is larger than said second electrode.
- 5. A method of manufacturing a lithium secondary battery as claimed in claim 1, wherein a viscosity of said polymer electrolyte composition is in the range of 1,000-50,000 cps.
- 6. A method of manufacturing a lithium secondary battery as claimed in claim 1, wherein said second electrode is attached with said polymer electrolyte layer by applying a pressure of 0.01-100 N/cm2.
- 7. 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.
- 8. A method of manufacturing a lithium secondary battery as claimed in claim 7, wherein said first electrode is larger than said second electrode.
- 9. 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.
- 10. A method of manufacturing a lithium secondary battery as claimed in claim 9, wherein said first electrode is larger than said second electrode.
Parent Case Info
This is a continuation-in-part of U.S. Pat. Ser. No. 09/484,535 filed on Jan. 18, 2000, which is now U.S. Pat. No. 6,403,266.
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Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09/484535 |
Jan 2000 |
US |
Child |
09/709710 |
|
US |