Lithium-ion secondary battery, battery apparatus, and electrical apparatus

Abstract

The present disclosure provides a lithium-ion secondary battery, a battery apparatus, and an electrical apparatus. The lithium-ion secondary battery includes a positive electrode plate; the positive electrode plate includes a positive electrode current collector and a positive electrode film layer arranged on at least one side of the positive electrode current collector; the positive electrode film layer includes a positive electrode active material, the positive electrode active material includes lithium transition metal phosphate particles, each lithium transition metal phosphate particle includes a lithium transition metal phosphate matrix and a coating layer that is located on at least part of a surface of the lithium transition metal phosphate matrix, and the coating layer includes a carbon element; a particle size distribution index (PDI) of the lithium transition metal phosphate particles is greater than or equal to 0.76 and less than 0.8; and R(sub)A50 of the roughness of the lithium transition metal phosphate particles is greater than or equal to 0.86.