Dry cathode film, dry cathode including the same, and all-solid secondary battery including the dry cathode film

A dry cathode film configured to be on a cathode current collector, the dry cathode film comprising:

• a first dry cathode active material layer adjacent to the cathode current collector;
• and
• a second dry cathode active material layer on the first dry cathode active material layer,
• wherein the first dry cathode active material layer and the second dry cathode active material layer each independently comprise a dry cathode active material, a dry sulfide-based solid electrolyte, and a dry binder, and
• wherein
• the dry cathode active material comprises a composite of Li2S, a lithium salt, and a carbon-based material,
• a content of the dry cathode active material in the first dry cathode active material layer is greater than a content of the dry cathode active material in the second dry cathode active material layer, and
• a content of the dry sulfide-based solid electrolyte in the first dry cathode active material layer is less than a content of the dry sulfide-based solid electrolyte in the second dry cathode active material layer.