All-solid-state secondary battery and method of charging the same

An all-solid-state secondary battery comprising:

• a cathode;
• an anode;
• and
• a solid electrolyte layer,
• wherein the cathode comprises a cathode active material layer,
• wherein the anode comprises an anode current collector and an anode active material layer on a surface of the anode current collector, wherein the anode active material layer comprises a binder and an anode active material comprising amorphous carbon,
• wherein the solid electrolyte layer is arranged between the cathode active material layer and the anode active material layer, and
• wherein a ratio of an initial charge capacity of the anode active material layer to an initial charge capacity of the cathode active material layer satisfies Equation 1:
• 0.01<(b/a)<0.5 Equation 1
• wherein a is the initial charge capacity of the cathode active material layer, determined from a first open circuit voltage to a maximum charging voltage vs. Li/Li+, and
• wherein b is the initial charge capacity of the anode active material layer, determined from a second open circuit voltage to 0.01 volts vs. Li/Li+.