公开(公告)号：US12142762B2

公开(公告)日：2024-11-12

申请号：US17620941

申请日：2020-06-16

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Toshinobu Kanai ,  Takeshi Ogasawara ,  Tetsuo Kadohata

IPC: H01M4/525 ,  C01G53/00 ,  H01M4/02 ,  H01M4/505 ,  H01M10/0525

Abstract: A positive electrode active material to be used in a non-aqueous electrolyte secondary battery and containing a lithium transition metal compound which contains Ni in a proportion constituting 80-94 mol %, inclusive, relative to the total mole number of the metal elements other than Li, and also contains Nb in a proportion constituting 0.1-0.6 mol %, inclusive, relative thereto, the positive electrode active material being characterized in that the Nb amount n1 in a first sample solution obtained by adding 0.2 g of the lithium transition metal compound to a hydrochloric acid aqueous solution comprising 5 mL of pure water/5 mL of 35% hydrochloric acid, and the Nb amount n2 in a second sample solution obtained by immersing a filter used to filter the first sample solution in a fluonitric acid comprising 5 mL of 46% hydrofluoric acid/5 mL of 63% nitric acid satisfy the condition of 50%≤n1/(n1+n2)

公开(公告)号：US20220367868A1

公开(公告)日：2022-11-17

申请号：US17620941

申请日：2020-06-16

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Toshinobu Kanai ,  Takeshi Ogasawara ,  Tetsuo Kadohata

IPC: H01M4/525 ,  H01M4/505 ,  H01M10/0525 ,  C01G53/00

Abstract: A positive electrode active material to be used in a non-aqueous electrolyte secondary battery and containing a lithium transition metal compound which contains Ni in a proportion constituting 80-94 mol %, inclusive, relative to the total mole number of the metal elements other than Li, and also contains Nb in a proportion constituting 0.1-0.6 mol %, inclusive, relative thereto, the positive electrode active material being characterized in that the Nb amount n1 in a first sample solution obtained by adding 0.2 g of the lithium transition metal compound to a hydrochloric acid aqueous solution comprising 5 mL of pure water/5 mL of 35% hydrochloric acid, and the Nb amount n2 in a second sample solution obtained by immersing a filter used to filter the first sample solution in a fluonitric acid comprising 5 mL of 46% hydrofluoric acid/5 mL of 63% nitric acid satisfy the condition of 50%≤n1/(n1+n2)

公开(公告)号：US20220231292A1

公开(公告)日：2022-07-21

申请号：US17621923

申请日：2020-06-16

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Toshinobu Kanai ,  Takeshi Ogasawara ,  Tetsuo Kadohata

IPC: H01M4/525 ,  H01M4/36 ,  C01G53/00

Abstract: A positive electrode active material characterized by containing a lithium transition metal compound that contains, relative to the total number of moles of metal elements other than Li, from 80% by mole to 94% mole (inclusive) of Ni and from 0.1% by mole to 0.6% by mole (inclusive) of Nb, and the amount of Nb (n1) in a first sample solution is obtained by adding 0.2 g of the lithium transition metal compound into an aqueous hydrochloric acid solution composed of 5 mL of pure water and 5 mL of 35% hydrochloric acid and the amount of Nb (n2) in a second sample solution that is obtained by immersing a filter that is used for filtration of the first sample solution into a fluoronitric acid composed of 5 mL of 46% hydrofluoric acid and 5 mL of 63% nitric acid satisfy the condition 75%≤n1/(n1+n2)