All-solid-state battery using lithium metal for negative electrode

An all-solid type battery, comprising:

• an electrode assembly comprising a negative electrode, a positive electrode and a solid electrolyte layer interposed between the positive electrode and the negative electrode,
• wherein the negative electrode comprises lithium metal as a negative electrode active material,
• wherein the solid electrolyte layer, the negative electrode and the positive electrode have equal area, or the solid electrolyte layer, the negative electrode and the positive electrode reduce in area in that order on the basis of an area of a stacked surface,
• wherein the negative electrode is in surface contact with the solid electrolyte layer, and disposed within the surface of the solid electrolyte layer,
• wherein the positive electrode is in indirect contact with the negative electrode, wherein the solid electrolyte layer is interposed between the positive electrode and the negative electrode, and disposed within the surface of the negative electrode,
• wherein the electrode assembly further comprises a protective layer comprising polymer resin between the negative electrode and the solid electrolyte layer,
• wherein the protective layer is in a shape of a frame with an edge portion having a predetermined width and an opening surrounded by the edge portion,
• wherein an area of the opening is smaller than an area of the positive electrode, and
• wherein the protective layer is placed such that the opening is disposed within the positive electrode surface.