Multilayer electrolyte cell, secondary battery comprising multilayer electrolyte cell and manufacturing method therefor

A manufacturing method of a secondary battery including cell having a multilayer electrolyte, comprising:

• (a) forming a polymer coating layer on a cathode;
• (b) stacking a ceramic solid electrolyte on an anode;
• and
• (c) stacking the ceramic solid electrolyte and the cathode so that the polymer coating layer is positioned between the ceramic solid electrolyte and the cathode,
• wherein the cell comprises:
• the ceramic solid electrolyte, wherein the ceramic solid electrolyte has a porous base structure including a Teflon-based binder and at least one inorganic ceramic, the porous base structure impregnated with an ionic liquid, wherein the at least one inorganic ceramic is selected from a group consisting of LiLaTiO3 (LLTO), Li1+xAlxTi2-x(PO4)3 (LTAP), Li7La3Zr2O12 (LLZO), and Li1+xTi2-xAlxSiy(PO4)3-y (where, 0<x<1, 0<y<1);
• the anode located on one side of the ceramic solid electrolyte;
• the cathode located on the other side of the ceramic solid electrolyte;
• and
• the polymer coating layer formed between the ceramic solid electrolyte and the cathode,
• wherein the polymer coating layer contacts the ceramic solid electrolyte and the cathode, and
• wherein the polymer coating layer is a single layer and consists of a polymer, a liquid electrolyte, a lithium salt, and an initiator.