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

Abstract

The present disclosure provides a lithium-ion secondary battery, a battery apparatus, and an electric 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 disposed 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 a lithium-transition metal phosphate particle. The lithium-transition metal phosphate particle includes a lithium-transition metal phosphate matrix and a coating on at least part of a surface of the lithium-transition metal phosphate matrix. The coating includes the carbon element. The lithium-transition metal phosphate particle contains the titanium element. The weight content of the titanium element in the positive electrode film layer is 2000 ppm to 8000 ppm. The X-ray diffractometry pattern of the lithium-transition metal phosphate particles has a first diffraction peak at a position with a diffraction angle 2θ of 35.5°-36.5°, and a second diffraction peak at a position with a diffraction angle 2θ of 24.5°-25°, where the peak intensity ratio of the second diffraction peak to the first diffraction peak is less than or equal to 3.5%.