Separator for lithium secondary battery and lithium secondary battery including the same

The present disclosure relates to a separator and a lithium secondary battery including the same, which may secure not only safety but also excellent long life span and high voltage properties. The separator (22) of the present invention includes a PE or PP base film (221) and a PE-based or PP-based powder (222) provided on and/or in the base film with a wherein the ingredients of the powder are different from those of the base film.