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 comprising:

• 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), surfaces of the primary particles are coated by a carbonaceous film,
• the coating ratio of the carbonaceous film to the primary particles is 60% or more and 95% or less,
• the thickness of the carbonaceous film is 0.2 nm or more and 10 nm or less,
• wherein an average particle diameter of the granulated bodies is 0.90 μm or more and 2.00 μm or less,
• particle diameters of 90% or more of the granulated bodies are 0.25 μm or more and 3.50 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 said plurality of diameters is considered as a particle diameter of each of the granulated bodies.