Lithium secondary battery polymer material and manufacturing method therefor

An all-solid-state lithium secondary battery comprising an electrode assembly consisting of:

• a positive electrode, a solid electrolyte, and a negative electrode, which are sequentially stacked;
• wherein the solid electrolyte comprises:
• a blend-type polymer formed by blending of:
• (i) a polythiophene-based polymer represented by the following Formula 1:
• wherein n is 70 to 280, PEG is polyethylene glycol, and when a number of ethylene oxide units of PEG is m, m is 4 to 15;
• and
• (ii) a conductive polymer,
• wherein the conductive polymer comprises poly-(3,4-ethylenedioxythiophene):
• poly(styrenesulfonate)(PEDOT:
• PSS),
• wherein the polythiophene-based polymer and the conductive polymer are contained in a weight ratio of 95:5 to 80:20,
• wherein the blend-type polymer has an electron conductivity of 10−8 S/cm to 10−2 S/cm, and
• wherein the solid electrolyte is a film comprising the blend-type polymer.