Electrode including active material layer in bilayer structure, manufacturing method therefor, and secondary battery comprising same

Abstract

Disclosed is an electrode including a multilayer structured electrode active material layer having two or more stacked sub-layers. The electrode is characterized in that the content of repeating unit (c) derived from a vinyl cyanide compound and repeating unit (d) derived from a (meth)acrylate compound in the lower layer is smaller than the content in the upper layer. It is possible to improve the binding force and resistance characteristics of the multilayer structured electrode by using a different composition of binder at the bottommost portion that is in contact with the current collector and at the topmost portion that is in contact with the separator. When using the multilayer structured electrode obtained by controlling the binder composition of the topmost portion and that of the bottommost portion to have a suitable composition of ingredients, it is possible to further improve battery performance, including capacity, life, output, or the like.