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This invention provides a lithium secondary battery, comprising: a battery casing; an electrode assembly housed within the battery casing; and an electrolyte, wherein the electrode assembly includes a positive electrode comprising a positive electrode active material, a separator, and a negative electrode comprising a negative electrode active material, and the electrolyte comprises LiPF6 as a lithium salt and ethylene carbonate as an organic solvent, wherein the ratio of the diameter (r) to the height (h) of the battery casing of the lithium secondary battery (shape factor ratio) is 0.4 or more, and satisfies the condition of mathematical formula (1), wherein in mathematical formula (1), h is the height (mm) of the battery casing, r is the diameter (mm) of the battery casing, and W LiPF6 The amount of LiPF6 relative to the total weight of the electrolyte, expressed as a percentage (%), W EC It is the amount of ethylene carbonate relative to the total weight of the electrolyte, expressed as a percentage (%), and W EL This represents the total weight (g) of the electrolyte contained in the lithium secondary battery. [Mathematical formula (1)]