Anode for all-solid secondary battery, all-solid secondary battery including the same, and manufacturing method thereof

A method of manufacturing an all-solid secondary battery, the method comprising:

• providing a cathode;
• disposing a solid electrolyte on the cathode;
• and
• disposing an anode on the solid electrolyte opposite the cathode, wherein the disposing of the anode comprises
• providing a composition comprising a compound of a first metal and a halogen on a first surface of the solid electrolyte to provide a composite layer,
• disposing lithium metal on the composite layer to form a lithium coated composite layer,
• heat treating the lithium coated composite layer to form an interlayer, wherein the interlayer comprises a first metal material having a particle size of about 0.1 nanometer to about 300 nanometers and a lithium ion conductor, and
• disposing a first anode active material layer on the interlayer to dispose the anode and manufacture the all-solid secondary battery,
• wherein the first anode active material layer comprises a lithium metal, a lithium alloy, or a combination thereof, and
• wherein the lithium metal or the lithium alloy have a particle size of about 0.1 micrometer to about 20 micrometers.