ALL-SOLID SECONDARY BATTERY AND METHOD OF PREPARING THE SAME

An all-solid secondary battery, including: a cathode; an anode; and a solid electrolyte disposed between the cathode and the anode, wherein the anode includes an anode current collector; a first anode active material layer in contact with the anode current collector and including a first metal; a second anode active material layer disposed between the first anode active material layer and the solid electrolyte and including a carbon-containing active material; and a contact layer between the second anode active material layer and the solid electrolyte, the contact layer including a second metal, and having a thickness less than a thickness of the first anode active material layer, wherein the second metal includes lithium metal, a lithium alloy, a metal alloyable with lithium, or a combination thereof.