Positive electrode and secondary battery

Abstract

A positive electrode for a secondary battery, comprising: a current collector; a first active material layer of the positive electrode provided on the current collector; and a second active material layer of the positive electrode provided on the first active material layer of the positive electrode, wherein the first active material layer of the positive electrode and the second active material layer of the positive electrode each comprise a single-particle active material of the positive electrode and an active material of the positive electrode with a larger particle diameter than that of the single-particle active material of the positive electrode, and wherein the porosity of the first active material layer of the positive electrode differs from the porosity of the second active material layer of the positive electrode.