Method of manufacturing positive electrode material for lithium ion secondary battery, positive electrode material for lithium ion secondary battery, positive electrode for lithium ion secondary battery and lithium ion secondary battery

A positive electrode material for a lithium ion secondary battery, comprising:

• aggregated particles in which LiFexMn1-x-yMyPO4 particles are aggregated, wherein relationships of 0.05≦x≦1.0 and 0≦y≦0.14 are satisfied, and M represents at least one selected from the group consisting of Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and a rare-earth element, and a surface of the LiFexMn1-x-yMyPO4 particles is coated with a carbonaceous film,
• wherein
• a specific magnetization quantity of the positive electrode material, which is measured under the conditions of room temperature, an excitation frequency of 80 Hz and at an applied magnetic field of 5 kOe, is 0.39 to 0.63 emu/g,
• I(020)/I(200) of the positive electrode material is 3.14 to 5.00 wherein the I(020)/I(200) is a ratio of X-ray intensity I(020) of a (020) face in which a diffraction angle 2θ is in the vicinity of 29° in an X-ray diffraction pattern to X-ray intensity I(200) of a (200) face in which a diffraction angle 2θ is in the vicinity of 17° in an X-ray diffraction pattern,
• a specific surface area of the positive electrode material is 10.3 to 19.3 m2/g,
• an average primary particle diameter of the primary particles of the positive electrode active material is 0.01 to 20 μm, and
• the average secondary particle diameter of the aggregated particle is 0.5 to 100 μm,
• the thickness of the carbonaceous film is 0.1 to 20 nm, and
• the amount of carbon in the positive electrode material is 0.5 to 5.0% by mass.