US 12,381,215 B2
Nonaqueous electrolyte secondary battery positive electrode active material and method for producing same, and nonaqueous electrolyte secondary battery which uses positive electrode active material
Hiroko Oshita, Niihama (JP); Kazuomi Ryoshi, Niihama (JP); Taira Aida, Niihama (JP); Koji Yamaji, Niihama (JP); and Jiro Okada, Niihama (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Filed on Mar. 21, 2024, as Appl. No. 18/612,290.
Application 18/612,290 is a division of application No. 16/760,130, granted, now 11,967,709, previously published as PCT/JP2018/028590, filed on Jul. 31, 2018.
Claims priority of application No. 2017-210305 (JP), filed on Oct. 31, 2017; and application No. 2018-086183 (JP), filed on Apr. 27, 2018.
Prior Publication US 2024/0234710 A1, Jul. 11, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/505 (2010.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/505 (2013.01) [H01M 4/0471 (2013.01); H01M 4/362 (2013.01); H01M 4/366 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method for evaluating a characteristic of a positive electrode active material for non-aqueous electrolyte secondary batteries,
the characteristic being a “slurry pH” indicating a pH of a slurry containing water and the positive electrode active material as a solid body component, the method comprising:
by adding the positive electrode active material to the water so that the slurry contains the positive electrode active material at a concentration of 50 g/L;
maintaining a state where the slurry is stirred for 30 minutes; and
obtaining the slurry pH by measuring the pH of the slurry with a “pH meter” in the state where the slurry is stirred.