Cell

A secondary cell comprising:

• a positive electrode;
• a negative electrode;
• and
• an electrolyte,
• wherein the positive electrode comprises:
• a positive electrode active material comprising an alkali metal compound represented by following formula (1):
• AxOy (1)
• wherein A is an alkali metal atom, x is in a range from 0.5 to 2.5, and y is in a range from 0.5 to 2.5;
• and
• a catalyst for the positive electrode,
• wherein the catalyst for the positive electrode comprises at least one element selected from the group consisting of Ag, Au, Cu, Fe, Co, and Ni, and
• the catalyst for the positive electrode is in a form of a solid solution in a crystal structure of the alkali metal compound represented by the formula (1),
• reactions at the positive electrode include one represented by a following formula:
• A2O2+2A++2e−⇔2A2O
• wherein A is the alkali metal atom,
• the negative electrode comprises a negative electrode active material comprising at least one material selected from the group consisting of an alkali metal, tin, titanium, boron, nitrogen, silicon, and carbon, and
• the positive electrode, the negative electrode, and the electrolyte are hermetically sealed in the secondary cell.