Secondary Battery

Abstract: The present specification provides a secondary battery comprising a cathode, an anode, a separator and an electrolyte, wherein the anode comprises an anode active material layer, the anode active material layer comprises SiOß (0 < ß < 2) oxide and a carbon-based active material, the cathode comprises a cathode active material layer, the cathode active material layer comprises an elementary particle active material of which the average particle diameter (D50) is 3 ? to 10 ? and a large particle active material of which the average particle diameter (D50) is 8 ? to 20 ?, and the porosity of the cathode active material layer is 19 % to 23 %.

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