Lithium-ion secondary battery, battery apparatus, power consuming apparatus, preparation method for positive electrode active material, and preparation method for positive electrode plate

A lithium-ion secondary battery, comprising 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;
• the positive electrode film layer comprises a positive electrode active material, and the positive electrode active material comprises lithium-containing transition metal phosphate particles with at least partial surfaces provided with carbon-coated materials;
• and
• in a cumulative distribution curve of a C value of a graphitization degree of the positive electrode film layer obtained in a mapping mode of a laser microscopic confocal Raman spectrometer, a median C50 of the graphitization degree is greater than or equal to 0.95 and less than or equal to 1.20, and a concentration (C90-C10)/C50 of the C value is 0.01-0.04, C10, C50, and C90 are C values corresponding respectively to cumulative distributions reaching 10%, 50%, and 90% in the cumulative distribution curve, wherein
• each C value of the graphitization degree is an intensity ratio IG/ID obtained at a corresponding scanning point in the mapping mode, the IG represents a G-band intensity of a Raman spectrum at 1580±100 cm−1, and the Ip represents a D-band intensity of the Raman spectrum at 1350+100 cm−1.