LITHIUM SECONDARY BATTERY HAVING CHARACTERISTIC OF SAFETY FOR NAIL PENETRATION

摘要

The present invention discloses a lithium secondary battery improved in nail safety. A lithium secondary battery according to the present invention includes: a positive electrode having a positive electrode active material and a positive electrode collector; A negative electrode comprising a negative electrode active material, and a negative electrode collector; And a separator, wherein the aluminum content of the cathode current collector is 99.0 to 99.9%, and the cathode current collector has a thickness of 10 to 18 탆.