Anode for solid-state secondary battery, solid-state secondary battery including the same, and method of preparing the same

A method of preparing a solid-state secondary battery, the method comprising:

• providing a three-dimensional porous current collector, which has a porosity of about 10 percent to about 99 percent, based on a total volume of the three-dimensional porous current collector, and comprises a plurality of pores extending along a thickness direction,
• wherein pores of the plurality of the pores have a size and a pitch and a ratio of the size to the pitch is about 0.1 to about 0.9;
• disposing a first anode active material layer on a first side of the three-dimensional porous current collector to prepare an anode;
• providing a cathode;
• disposing a solid electrolyte on the cathode;
• and
• disposing the anode on the solid electrolyte opposite the cathode
• wherein the first anode active material layer faces the solid electrolyte, to prepare the solid-state secondary battery.