POSITIVE ELECTRODE ACTIVE MATERIAL LAYER INCLUDING FIRST POSITIVE ELECTRODE ACTIVE MATERIAL AND SECOND POSITIVE ELECTRODE ACTIVE MATERIAL, AND METHOD FOR PRODUCING POSITIVE ELECTRODE INCLUDING SAID POSITIVE ELECTRODE ACTIVE MATERIAL LAYER

摘要

A parameter for producing a positive electrode having excellent safety, and a positive electrode active material layer satisfying the parameter. The positive electrode active material layer includes a first positive electrode active material, a second positive electrode active material having a lower charge/discharge potential than the first positive electrode active material, and an additive. When the first positive electrode active material tap density is defined as dt₁, the second positive electrode active material tap density is defined as dt₂, a true density of the additive is defined as d₃, a mass percentage of the first positive electrode active material is defined as Wt₁, a mass percentage of the second positive electrode active material is defined as Wt₂, a mass percentage of the additive is defined as Wt₃, and a porosity of the positive electrode active material layer is defined as p, the positive electrode active material layer satisfies (1−p)×(Wt₁/dt₁)/((Wt₁/dt₁)+(Wt₂/dt₂)+(Wt₃/d₃))0.38.