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 comprises a positive electrode plate; the positive electrode plate includes a positive electrode current collector and a positive electrode film layer disposed on at least one side of the positive electrode current collector; the positive electrode film layer includes a positive active material, which contains lithium-transition metal phosphate particles; the lithium transition metal phosphate particles each include a lithium transition metal phosphate matrix and a coating layer on at least a part of the surface of the lithium transition metal phosphate matrix, where the coating layer contains carbon elements; volume percent of pore structures with a pore size of 2 nm to 50 nm is less than or equal to 65%, and area percent of pore structures with a pore size of 2 nm to 50 nm is less than or equal to 90%; in accumulative distribution curve of coating B-value of the positive electrode film layer that is obtained by a laser-confocal microscope Raman spectrometer in an area scanning mode, the median B50 of the coating value is less than or equal to 0.46.