US 12,142,762 B2
Positive electrode active material for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and method for producing positive electrode active material for non-aqueous electrolyte secondary battery
Toshinobu Kanai, Hyogo (JP); Takeshi Ogasawara, Osaka (JP); and Tetsuo Kadohata, Hyogo (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/620,941
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Jun. 16, 2020, PCT No. PCT/JP2020/023540
§ 371(c)(1), (2) Date Dec. 20, 2021,
PCT Pub. No. WO2020/262100, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-121844 (JP), filed on Jun. 28, 2019.
Prior Publication US 2022/0367868 A1, Nov. 17, 2022
Int. Cl. H01M 4/525 (2010.01); C01G 53/00 (2006.01); H01M 4/02 (2006.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); C01P 2002/80 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01); H01M 2300/0017 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A positive electrode active material for a non-aqueous electrolyte secondary battery, comprising:
a lithium transition metal compound which contains Ni in a ratio of greater than or equal to 80 mol % and less than or equal to 94 mol % with respect to a total number of moles of metal elements other than Li, and which contains Nb in a ratio of greater than or equal to 0.1 mol % and less than or equal to 0.6 mol % with respect to the total number of moles of the metal elements other than Li, wherein
a condition of 50%≤n1/(n1+n2)<75% is satisfied in a molar amount equivalence, wherein n1 is an amount of Nb, quantitated through inductively coupled plasma atomic emission spectroscopy, in a first filtered solution obtained by dissolving a first sample solution, in which 0.2 g of the lithium transition metal compound is added to an aqueous solution of hydrochloric acid having 5 mL of pure water/5 mL of 35% hydrochloric acid, for 120 minutes under bumping, and filtering the first sample solution, and n2 is an amount of Nb, quantitated through inductively coupled plasma atomic emission spectroscopy, in a second filtered solution obtained by dissolving a second sample solution, in which a filter used for the filtration of the first sample solution is immersed in fluonitric acid having 5 mL of 46% hydrofluoric acid/5 mL of 63% nitric acid, for 180 minutes under bumping, and filtering the second sample solution.