Lithium-ion battery

A lithium-ion battery comprising a cathode, an anode, and an electrolyte solution, wherein

• the anode includes a substrate and a metal anode layer,
• the metal anode layer is provided on a surface of the substrate,
• the metal anode layer includes Li, a first element, and a second element,
• the second element is different from the first element,
• the first element is at least one kind selected from the group consisting of Mg, Ga, Ag, Au, and Cd,
• the second element is at least one kind selected from the group consisting of Na, Mg, Al, Si, Ca, Sc, Ti, Mn, Zn, Ga, Ge, Sr, Rh, Y, Zr, Pd, In, Sn, Ba, Ag, Pb, Ir, Au, Pt, Bi, Sb, Cd, Nd, and Tl,
• the following relationship is satisfied:
• M1:M2=60:40 to 98:2,
• the M1 represents a mass of the first element contained in the metal anode layer,
• the M2 represents a mass of the second element contained in the metal anode layer,
• the metal anode layer includes a first phase and a second phase,
• the first phase includes Li and the first element,
• the second phase includes Li and the second element,
• in a cross section of the metal anode layer, the following relationship is satisfied:
• 1×10−5%≤S2/S1≤90%,
• the S1 represents a total area of the first phase in the cross section,
• the S2 represents a total area of the second phase in the cross section,
• the first phase includes a continuous phase,
• the second phase includes a dispersed phase dispersed in particles in the continuous phase, and
• in the cross section of the metal anode layer, an aspect ratio of the second phase is 1 to 4.