Electrode, manufacturing method thereof, and secondary battery including same

A method of manufacturing an electrode comprising an electrode active material sheet comprising an electrode active material and a binder polymer, and a current collector having a mesh structure,

• wherein at least a part of the mesh structure is present in the electrode active material sheet,
• wherein the binder polymer has a thermal decomposition temperature ranging from 270° C. to 315° C.,
• wherein the binder polymer comprises a first binder polymer and a second binder polymer,
• wherein the binder polymer comprises the first binder polymer and the second binder polymer in a weight ratio of 85:15 to 92.5:7.5, and
• wherein the first binder polymer consists of styrene-butadiene rubber, and the second binder polymer comprises polytetrafluoroethylene,
• the method comprising:
• preparing the current collector having the mesh structure and the electrode active material sheet comprising the electrode active material and the binder polymer;
• and
• placing the electrode active material sheet on the current collector and applying pressure to insert at least a part of the mesh structure into the electrode active material sheet,
• wherein the electrode active material sheet is prepared by a method including:
• (a) mixing the electrode active material and the binder polymer to form a granular composite;
• (b) sieving the granular composite;
• and
• (c) applying pressure to the granular composite to form the electrode active material sheet.