公开(公告)号：US11942631B2

公开(公告)日：2024-03-26

申请号：US18170373

申请日：2023-02-16

Applicant: NICHIA CORPORATION

Inventor： Ryuhei Hattori ,  Yoshitomo Miyashita ,  Tatsuya Yokoyama ,  Chika Nishio ,  Takashi Sugimoto

IPC: H01M4/485 ,  C01G53/00 ,  H01M4/02 ,  H01M4/131 ,  H01M4/1391

CPC classification number: H01M4/485 ,  C01G53/40 ,  C01G53/42 ,  H01M4/131 ,  H01M4/1391 ,  C01P2002/52 ,  H01M2004/028

Abstract: A method of producing a positive electrode active material, the method includes: contacting first particles that contain a lithium transition metal composite oxide with a solution containing sodium ions to obtain second particles containing the lithium transition metal composite oxide and sodium element, wherein the lithium transition metal composite oxide has a layered structure and a composition ratio of a number of moles of nickel to a total number of moles of metals other than lithium in a range of from 0.7 to less than 1; mixing the second particles and a boron compound to obtain a mixture; and heat-treating the mixture at a temperature in a range of from 100° C. to 450° C.

公开(公告)号：US11621415B2

公开(公告)日：2023-04-04

申请号：US16926613

申请日：2020-07-10

Applicant: NICHIA CORPORATION

Inventor： Ryuhei Hattori ,  Yoshitomo Miyashita ,  Tatsuya Yokoyama ,  Chika Nishio ,  Takashi Sugimoto

IPC: H01M4/485 ,  H01M4/131 ,  H01M4/1391 ,  C01G53/00 ,  H01M4/02

Abstract: A method of producing a positive electrode active material, the method includes: contacting first particles that contain a lithium transition metal composite oxide with a solution containing sodium ions to obtain second particles containing the lithium transition metal composite oxide and sodium element, wherein the lithium transition metal composite oxide has a layered structure and a composition ratio of a number of moles of nickel to a total number of moles of metals other than lithium in a range of from 0.7 to less than 1; mixing the second particles and a boron compound to obtain a mixture; and heat-treating the mixture at a temperature in a range of from 100° C. to 450° C.

公开(公告)号：US11837723B2

公开(公告)日：2023-12-05

申请号：US16795539

申请日：2020-02-19

Applicant: NICHIA CORPORATION

Inventor： Kumi Yoshihara ,  Kosuke Shimokita ,  Kiyoto Ikebata ,  Takashi Sugimoto

IPC: H01M4/525 ,  H01M4/36 ,  H01M4/505 ,  H01M10/0525 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/02 ,  C01G53/00

CPC classification number: H01M4/525 ,  C01G53/50 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/366 ,  H01M4/505 ,  H01M10/0525 ,  C01P2002/52 ,  C01P2002/54 ,  C01P2004/03 ,  C01P2004/45 ,  C01P2004/51 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/40 ,  H01M2004/028 ,  Y02E60/10

Abstract: Provided is a positive-electrode active material for a nonaqueous electrolyte secondary battery, including a lithium transition metal composite oxide particle having a layered structure and containing nickel, and an oxide containing lithium and aluminum and an oxide containing lithium and boron adhering to a surface of the lithium transition metal composite oxide particle. The lithium transition metal composite oxide particle includes a secondary particle formed by aggregation of primary particles containing a solid solution of aluminum in a surface layer. The lithium transition metal composite oxide particles have a composition with a difference of more than 0.22 mol % and less than 0.6 mol % between a ratio of the number of moles of aluminum in the solid solution in the surface layer of the primary particles relative to a total number of moles of metal other than lithium and a ratio of the number of moles of aluminum present in a region other than the surface layer of the primary particles relative to the total number of moles of metal other than lithium.