All-solid secondary battery and method of manufacturing the same

An anode layer comprising:

• an anode current collector,
• a first anode active material layer, and
• a second anode active material layer between the anode current collector and the first anode active material layer;
• wherein the first anode active material layer is adjacent to a solid electrolyte layer and comprises a porous first active material comprising a metal or metal alloy capable of forming an alloy or a compound with lithium, and
• the second anode active material layer comprises a second anode active material comprising a carbon anode active material, and optionally, a metal or metalloid anode active material,
• wherein the pores of the first anode active material are about 3 nanometers to about 50 nanometers.

An all-solid secondary battery comprising:

• a cathode layer comprising a cathode active material;
• an anode layer comprising an anode current collector, a first anode active material layer, and a second anode active material layer between the anode current collector and the first anode active material layer;
• and
• a solid electrolyte layer between the cathode layer and the anode layer and comprising a solid electrolyte,
• wherein the first anode active material layer includes pores and is adjacent to the solid electrolyte layer, and the first anode active material layer consists of a metal or metal alloy capable of forming an alloy or a compound with lithium,
• and the second anode active material layer comprises a second anode active material comprising a carbon anode active material, and optionally, a metal or metalloid anode active material.

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

• providing a solid electrolyte layer having a first surface and an opposite second surface;
• placing a first anode active material layer on the first surface of the solid electrolyte layer;
• forming pores in the first anode active material layer to provide a porous first anode active material;
• providing an anode current collector and a second anode active material layer on the anode current collector;
• positioning the porous first anode active material adjacent to the second anode active material layer;
• and
• positioning a cathode active material layer on the second surface of the solid electrolyte layer to manufacture an all-solid secondary battery,
• wherein a size of the pores of the first anode active material are about 3 nanometers to about 50 nanometers.