Abstract: Disclosed is a secondary battery including an electrode assembly in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction, a battery can in which the electrode assembly is accommodated, and a sealing body which seals an open end of the battery can. The positive electrode plate includes a positive electrode active material which includes a core having a single particle or quasi-single particle type and a coating layer formed on the core and including a conductive nano material.

Abstract: A current collector for a secondary battery has a material having an elongation of 1.5 to 3.0% and a tensile strength of 25 to 35 kgf/mm2. An electrode, an electrode assembly, cylindrical battery cell, and battery pack are also provided.

Abstract: A lithium secondary battery which includes an electrode assembly in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction, a battery can in which the electrode assembly is accommodated, and a sealing body which seals an open end of the battery can. The positive electrode plate includes a positive electrode active material layer, and the positive electrode active material layer includes scaly graphite and positive electrode active material powder including single particles, quasi-single particles, or a combination thereof.

Abstract: The present invention relates to a transdermal delivery composite comprising a cyclodextrin-based covalent organic framework and polymer. In addition, the present invention relates to a cosmetic composition comprising the transdermal delivery composite, and a method for preparing the transdermal delivery composite.