| abstract |
[PROBLEMS] To increase the bulk of a raw material after it is pulverized by pulverization of the raw material after calcining, and to increase the bulk of the material to be calcined at the time of main calcining by adding a conductive carbon precursor to the raw material after calcining. In view of the increase, the amount of the firing object that can be fired at a time is increased by increasing the amount of the firing object introduced into the firing furnace, and the lithium ion secondary battery positive electrode material is efficiently manufactured. In a method for producing a positive electrode material for a lithium ion secondary battery in which a raw material is fired to produce a lithium iron phosphate positive electrode material, the firing process includes a first stage from room temperature to 300 ° C. to 450 ° C., And a second stage from the first stage to the firing completion temperature, and after the aggregate of secondary particles formed by agglomeration of the primary particles produced by the first stage firing is compressed to a predetermined bulk density, Two-stage firing is performed. [Selection] Figure 1 |