Lithium secondary battery

A lithium secondary battery comprising an electrode, the electrode including:

• a current collector comprising a structure in a fabric form in which fiber bundles are cross-woven, wherein:
• each of the fiber bundles is formed of fiber yarns,
• the fiber yarns each include a polymer fiber and a metal layer surrounding the polymer fiber;
• a diameter of the fiber bundles is 18 μm to 20 μm;
• an active material layer disposed on at least one surface of the current collector,
• the metal layer comprises a first metal layer surrounding the polymer fiber and a second metal layer surrounding the first metal layer,
• the first metal layer comprises nickel, and
• the second metal layer comprises copper.