Lithium secondary battery

A lithium secondary battery, comprising:

• a positive electrode including a positive electrode material mixture containing a positive electrode active material and a positive electrode additive;
• a negative electrode including a negative electrode current collector;
• a separator disposed between the positive electrode and the negative electrode;
• and
• an electrolyte, wherein
• on the negative electrode, lithium metal deposits during charge and the lithium metal dissolves in the electrolyte during discharge,
• the positive electrode additive includes at least one selected from the group consisting of a first compound represented by a general formula (1):
• Lia1Fex1M1y1Oz1 and a second compound represented by a general formula (2):
• Lia2Nix2M2y2Oz2,
• the general formula (1) satisfies 0≤a1≤5, 0≤x1≤5, 0≤y1≤1, and 0≤z1≤4,
• where at least two of a1, x1, y1 and z1 are greater than 0,
• the M1 includes at least one selected from the group consisting of Co, Cu, Mg, Ni, Mn, Zn, Al, Ga, Ge, Ti, Si, Sn, Ce, Y, Zr, S, and Na,
• the general formula (2) satisfies 0≤a2≤2, 0≤x2≤1, 0≤y2≤1, and 1≤z2≤2,
• where at least one of a2 and x2 is greater than 0,
• the M2 includes at least one selected from the group consisting of Co, Cu, Mg, Fe, Mn, Zn, Al, Ga, Ge, Ti, Si, Sn, Ce, Y, Zr, S, and Na, and
• the electrolyte contains an oxalate complex salt having an oxalate complex anion and a lithium ion.