Positive electrode and secondary battery

Abstract

The present invention relates to a secondary battery including a current collector; a first positive electrode active material layer provided on the current collector; and a second positive electrode active material layer provided on the first positive electrode active material layer, wherein the first positive electrode active material layer and the second positive electrode active material layer each contain single-particle positive electrode active material and positive electrode active material having a particle size larger than that of the single-particle positive electrode active material, and the porosity of the first positive electrode active material layer is different from the porosity of the second positive electrode active material layer, or the pore area ratio of the second positive electrode active material layer to the pore area ratio in the cross-sectional image of the first positive electrode active material layer is 1.05 to 3 times, and also relates to a method for manufacturing the positive electrode for a secondary battery and the secondary battery including the same.

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