Method of manufacturing separator-composite electrode comprising multilayer-structured inorganic layer and separator-composite electrode manufactured thereby

A method of manufacturing a separator-composite electrode, comprising:

• manufacturing a first inorganic layer slurry comprising first inorganic particles and a first binder and having a viscosity of 5000 cP to 20000 cP;
• manufacturing a second inorganic layer slurry comprising second inorganic particles and a second binder;
• preparing a unit electrode comprising an electrode active material layer formed on at least one surface of an electrode current collector;
• and
• forming a first inorganic layer by applying the first inorganic layer slurry on at least one surface of the electrode active material layer;
• and
• forming a second inorganic layer by applying the second inorganic layer slurry on the first inorganic layer,
• wherein a D50 diameter of the first inorganic particles is greater than a pore size of the electrode active material layer, and a D50 diameter of the second inorganic particles is smaller than the D50 diameter of the first inorganic particles, and
• the manufacturing the first inorganic layer slurry, the manufacturing the second inorganic layer slurry and the preparing the unit electrode are performed in any order, or two or more steps may be performed at the same time.