Lithium Secondary Battery

A lithium secondary battery comprising

• a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte,
• wherein:
• the positive electrode comprises a positive electrode active material, wherein the positive electrode active material comprises lithium iron phosphate particles, and the positive electrode has a loading amount of 500 mg/25 cm2 to 740 mg/25 cm2;
• and
• the non-aqueous electrolyte comprises a lithium salt, an organic solvent, and an additive, wherein the organic solvent comprises a cyclic carbonate-based solvent and a linear carbonate-based solvent, the linear carbonate-based solvent comprises dimethyl carbonate, the additive comprises vinylene carbonate, a volume ratio of the cyclic carbonate-based solvent to the linear carbonate-based solvent is from 10:90 to 35:65, and a weight ratio of the vinylene carbonate to the dimethyl carbonate is greater than 0 and less than or equal to 0.2.