Electrodeposited copper foil and method for producing the same, and current collector for lithium secondary battery and secondary battery comprising the electrodeposited copper foil

摘要

An electrodeposited copper foil of high toughness having a lightness L* value of the deposit side in the range of 36 to 74, the copper foil having a tensile strength in the range of 40 to 70 kg/mm², and a weight deviation of less than 3%. The electrodeposited copper foils are particularly useful as current collectors for anode components of rechargeable secondary batteries and tend not to form wrinkles during charge-discharge cycles of the battery and are resistant to fracture during pressing of the anode active materials onto the copper foil. Secondary batteries and methods of manufacture are also described.