Method for manufacturing cable-type secondary battery

A method for manufacturing a cable secondary battery comprising:

• forming an anode having a first electrolyte layer thereon by sequentially extrusion-coating an electrode slurry and a solid electrolyte material on a current collector, the anode having a horizontal cross section of a predetermined shape and extending longitudinally;
• the forming the anode having the first electrolyte layer thereon comprising:
• forming the anode by putting the electrode slurry including an anode active material, a polymer binder, and a solvent into an extruder having an O-die;
• extrusion-coating the electrode slurry put through a providing unit of the O-die on the current collector that goes through the O-die while continuously providing the current collector to the extruder having the O-die;
• and drying the current collector coated with the electrode slurry to form an active material layer;
• and
• forming the first electrolyte layer around a perimeter of the anode by putting the solid electrolyte material into the extruder having the O-die, and extrusion-coating the solid electrolyte material on a surface of the anode that goes through the O-die while continuously providing the anode to the extruder having the O-die;
• forming a cathode by putting an electrode slurry including a cathode active material, a polymer binder, and a solvent into an extruder having an O-die;
• extrusion-coating the electrode slurry put through a providing unit of the O-die on a current collector that goes through the O-die while continuously providing the current collector to the extruder having the O-die;
• and drying the current collector coated with the electrode slurry to form an active material layer;
• forming a second electrolyte layer around a perimeter of a plurality of inner electrodes by extrusion-coating a solid electrolyte material, the plurality of inner electrodes including at least two of the anodes and at least two of the cathodes arranged in parallel;
• and
• forming a protection coating around the second electrolyte layer,
• wherein the solid electrolyte material includes an electrolyte selected from the group consisting of a gel polymer electrolyte of polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polymethylmethacrylate (PMMA), polyacrylonitrile (PAN), or polyvinylacetate (PVAc);
• and a solid polymer electrolyte of polyethylene oxide PEO, polyphenylene oxide (PPO), polyetherimide (PEI), polyethersulfone (PES), or polyvinylacetate (PVAc).