METHOD FOR PRODUCING POSITIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY

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PROBLEM TO BE SOLVED : To provide : a positive electrode material for a lithium ion secondary battery, reduced in an amount of magnetic impurities and an amount of water-containing impurities; a positive electrode for a lithium ion secondary battery; and a lithium ion secondary battery. SOLUTION : A positive electrode material for a lithium ion secondary battery of the present invention includes : a center particle comprising LiFexMn1-x-yMyPO4 (where, 0.05≤x≤1.0 and 0≤y≤0.14 are satisfied, and M represents at least one selected from among Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, G and a rare earth element); and a carbonaceous coat coating the surface of the center particle. The positive electrode material has an amount of relative magnetization of 0.70 emu/g or less, and has a moisture content of 8, 000 ppm or less, the moisture content being detected in a temperature range of from 100°C or above to 250°C or below by the Karl Fisher titration method. SELECTED DRAWING : None COPYRIGHT : (C)2017, JPO&INPIT