Three dimensional all-solid-state lithium ion battery and method of fabricating the same

A method of manufacturing an all-solid-state lithium ion battery comprising a cathode protection layer, the method comprising:

• disposing a cathode on an upper surface of a cathode current collector, the cathode comprising a cathode active material;
• forming the cathode protection layer on the cathode current collector to cover the cathode;
• forming a solid state electrolyte layer covering the cathode protection layer;
• forming an anode covering the solid state electrolyte layer;
• and
• forming an anode current collector on the anode to manufacture the all-solid state lithium ion battery comprising the cathode protection layer,
• wherein the cathode protection layer is between the cathode and the solid state electrolyte layer,
• wherein the solid state electrolyte layer is between the cathode protection layer and the anode, and
• wherein the cathode protection layer comprises a metal oxide comprising Al, Si, Ti, Zr, Sn, Mg, Ca, or a combination thereof.