All-solid secondary battery

An all-solid secondary battery comprising:

• a cathode layer;
• an anode layer;
• a solid electrolyte layer between the cathode layer and the anode layer;
• and
• a first inactive member on a side of the cathode layer,
• the cathode layer comprising a cathode current collector and a cathode active material layer on one side or two sides of the cathode current collector,
• the cathode active material layer comprising a lithium-containing sulfide-based cathode active material,
• the lithium-containing sulfide-based cathode active material comprising Li2S, a Li2S-containing composite, or a combination thereof,
• the anode layer comprising an anode current collector and a first anode active material layer on one side of the anode current collector,
• a ratio (B/A) of an initial charge capacity (B) of the first anode active material layer to an initial charge capacity (A) of the cathode active material layer being about 0.005 to about 0.45,
• the initial charge capacity (A) of the cathode active material layer being determined by charging from a 1st open circuit voltage up to a maximum charging voltage for Li/Li+, and
• the initial charge capacity (B) of the first anode active material layer being determined by charging from a 2nd open circuit voltage up to a voltage of about 0.01 volt (V) for Li/Li+.