Lithium-ion secondary battery, battery device, and power-consuming device

Abstract

A lithium-ion secondary battery characterized in that it comprises a positive electrode plate, a negative electrode plate, and an electrolyte, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode film layer arranged on at least one side of the positive electrode current collector, wherein the positive electrode film layer comprises a positive electrode active material, wherein the positive electrode active material comprises lithium-containing transition metal phosphate particles, wherein at least a portion of the surface of the particles is provided with a carbon coating material, and wherein, based on the total surface area of ​​the particles in a cross-sectional area of ​​the positive electrode film layer along the thickness direction of the electrode plate, the surface area fraction of the particles whose particle size R1 meets the condition 1.5 µm ≤ R1 < 5 µm is 10.0% to 20.0%, the surface area fraction of the particleswhose particle size R2 meets the condition 50 nm ≤ R2 < 200 nm is 5.0% to 12.0%, and the surface area fraction of the particles whose particle size R3 meets the condition 200 nm ≤ R3 < 1.5 µm is 73.0% to 80.0%; and wherein the particle size concentration (DA90-DA10) / DA50 of the particles whose particle size R3 meets is 1.40 to 1.683.