Patent ID: 11870071
Assignee: SUMITOMO METAL MINING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC H

Claim 13:
14. A method for evaluating the positive electrode active material for non-aqueous electrolyte secondary battery according to claim 1, the positive electrode active material containing a lithium-nickel-manganese composite oxide represented by a general formula (1): LidN11−a−b−cMnaMbNbcO2+α [where M is at least one element selected from the group consisting of Co, W, Mo, V, Mg, Ca, Al, Ti, Cr, Zr and Ta, 0.05<a<0.6, 0, 0<b<0.6, 0.0003<c<0.03, 0.95<d<1.2, 0.33<(1−a−b−c), and 0<α<0.4], the method comprising:
measuring an amount of lithium that is eluted into water when the positive electrode active material is immersed in water and determined by a neutralization titration method; and
selecting a positive electrode active material in which the amount of lithium eluted into water is 0.02% by mass or more and 0.10% by mass or less with respect to entire positive electrode active material.