A battery capable of improving the constant output discharge capacity is provided. A battery includes a cathode, an anode, and an electrolyte. The cathode contains iron sulfide. The anode contains lithium metal or a lithium alloy. A ratio of a discharge capacity per unit area of the cathode to a discharge capacity per unit area of the anode (the discharge capacity per unit area of the cathode/the discharge capacity per unit area of the anode) is more than 1 and 1.4 or less.
1. A battery comprising:
a cathode;
an anode; and
an electrolyte,
wherein the cathode contains iron sulfide,
the anode contains lithium metal or a lithium alloy, and
a ratio of a discharge capacity per unit area of the cathode to a discharge capacity per unit area of the anode is greater than 1 and 1.4 or less.
2. The battery according to claim 1 , wherein the ratio of the discharge capacity per unit area of the cathode to the discharge capacity per unit area of the anode is 1.1 or more and 1.4 or less.