ALL-SOLID SECONDARY BATTERY

An all-solid secondary battery includes: a cathode layer; an anode layer; a first solid electrolyte layer adjacent to the cathode layer; and a second solid electrolyte layer adjacent to the anode layer. The cathode layer includes a cathode current collector and a cathode active material layer on the cathode current collector. The anode layer includes an anode current collector and a first anode active material layer or a third anode active material layer on the anode current collector. A composite solid electrolyte and an insulating member are located between the first solid electrolyte layer and the second solid electrolyte layer, wherein the composite solid electrolyte is on a central portion of the second solid electrolyte layer and includes an ion conductor and a lithium salt, and the insulating member is on peripheral portions of the second solid electrolyte layer and is around outer surfaces of the composite solid electrolyte.