Positive electrode sheet, battery cell, battery, and electric device

Abstract

A positive electrode sheet, a battery cell, a battery, and an electric device, relating to the technical field of batteries. The positive electrode sheet comprises a positive electrode active material layer; the positive electrode active material layer comprises a first positive electrode active material layer and a second positive electrode active material layer; the first positive electrode active material layer comprises a first positive electrode active material and a first conductive agent; the second positive electrode active material layer comprises a second positive electrode active material; the electronic conductivity of the second positive electrode active material is greater than the electronic conductivity of the first positive electrode active material; and the powder resistivity F of the second positive electrode active material under 8 MPa with Ω·cm as a unit and the weight proportion C of the first conductive agent in the first positive electrode active material layer satisfy the following relationship: 3.6≤F / (Cx100)≤42.1. The conductivity difference between the first positive electrode active material layer and the second positive electrode active material layer can be reduced, thereby improving the exertion of electrical properties of the whole positive electrode sheet.

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