Cathode material for lithium-ion secondary battery, cathode for lithium-ion secondary battery, and lithium-ion secondary battery

A cathode material for a lithium-ion secondary battery which comprises granulated bodies in which primary particles are aggregated,

• wherein the primary particles are represented by general formula LixAyMzPO4 (here, A represents at least one element selected from the group consisting of Fe, Mn, Co, and Ni, M represents at least one element selected from the group consisting of Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements, 0<x≤1.1 0.8≤y≤1.1 and 0≤z≤0.2) (supported by claim 4, and x is amended such that x is greater than 0),
• surfaces of the primary particles are coated by a thermally decomposed carbonaceous film (supported by claim 3 and the paragraph 0074),
• the thickness of the carbonaceous film is 0.2 nm or more and 10 nm or less (supported by the paragraph 0030),
• wherein an average particle diameter of the granulated bodies is 4.50 μm or more and 6.20 μm or less, and
• particle diameters of 90% or more of the granulated bodies are 1.00 μm or more and 11.00 μm or less,
• wherein particle diameters of the granulated bodies are evaluated such that 300 granulated bodies are randomly selected from a view of the granulated bodies using a scanning electron microscope,
• a plurality of diameters of each of the 300 granulated bodies that pass through a central point thereof are evaluated, and
• a maximum diameter selected from the plurality of diameters is considered as a particle diameter of each of granulated bodies.