公开(公告)号：US20220344656A1

公开(公告)日：2022-10-27

申请号：US17761892

申请日：2020-09-18

Applicant: SUMITOMO METAL MINING CO., LTD.

Inventor： Tetsutaro Hayashi ,  Shun Kai Bong ,  Shinsuke Suganuma ,  Toshihiro Kato

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

Abstract: To provide a positive electrode active material capable of further reducing positive electrode resistance and exhibiting better output characteristics.
A positive electrode active material includes a coating layer formed of a metal composite oxide of Li and one or more metal elements selected from Al, Ti, Zr, Nb, Mo, and W on at least a part of a surface of lithium transition metal-containing composite oxide particles, and has d50 of 3.0 to 7.0 μm, a BET specific surface area of 2.0 to 5.0 m2/g, a tap density of 1.0 to 2.0 g/cm3, and an oil absorption amount of 30 to 60 ml/100 g, in which the amount of metal elements other than Li contained in the coating layer is 0.1 to 1.5 atom % with respect to the total number of atoms of Ni, Mn, and Co contained in the composite oxide particles.

公开(公告)号：US20210395105A1

公开(公告)日：2021-12-23

申请号：US17287726

申请日：2019-10-21

Applicant: SUMITOMO METAL MINING CO., LTD.

Inventor： Tetsutaro Hayashi ,  Shinsuke Suganuma ,  Shuuzou Ozawa

IPC: C01G53/04 ,  H01M4/525 ,  H01M4/505 ,  H01M4/36 ,  H01M10/0525

Abstract: A method for producing a metal composite hydroxide, which includes a first crystallization process of supplying a first raw material aqueous and performing a crystallization reaction and a second crystallization process of supplying a second raw material aqueous solution containing a more amount of tungsten than the first raw material aqueous solution and performing a crystallization reaction to form a tungsten-concentrated layer and in which switching of reaction atmosphere from either atmosphere of a non-oxidizing atmosphere or an oxidizing atmosphere to the other atmosphere is performed two or more times in particle growth and the time for supplying the second raw material aqueous solution into the reaction tank in the non-oxidizing atmosphere is 50% or more with respect to the entire time for supplying the second raw material aqueous solution into the reaction tank.

公开(公告)号：US20220376243A1

公开(公告)日：2022-11-24

申请号：US17761909

申请日：2020-09-18

Applicant: SUMITOMO METAL MINING CO., LTD.

Inventor： Tetsutaro Hayashi ,  Shun Kai Bong ,  Shinsuke Suganuma ,  Toshihiro Kato ,  Jiro Okada

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/485 ,  H01M4/505 ,  H01M50/46

Abstract: The positive electrode active material is capable of reducing positive electrode resistance, exhibiting better output characteristics, and having high mechanical strength when the positive electrode active material is used in a lithium ion secondary battery. Secondary particles have a d50 of 3.0 to 7.0 μm, a BET specific surface area of 2.0 to 5.0 m2/g, a tap density of 1.0 to 2.0 g/cm3, and an oil absorption amount of 30 to 60 ml/100 g. In each of a plurality of primary particles having a primary particle size of 0.1 to 1.0 μm, a coefficient of variation of the concentration of an additive element M is 1.5 or less. The volume of a linking section between the primary particles per primary particle, obtained from the total volume of the linking section and the number of primary particles constituting the secondary particles, is 5×105 to 9×107 nm3.

公开(公告)号：US20220367859A1

公开(公告)日：2022-11-17

申请号：US17761852

申请日：2020-09-18

Applicant: SUMITOMO METAL MINING CO., LTD.

Inventor： Tetsutaro Hayashi ,  Shun Kai Bong ,  Shinsuke Suganuma ,  Toshihiro Kato

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525

Abstract: A positive electrode active material includes lithium transition metal-containing composite oxide particles containing an additive element M1 and includes a coating layer formed of a metal composite oxide of Li and a metal element M2 on a part of a surface of the particles. The particles have a d50 of 3.0 to 7.0 μm, a BET specific surface area of 2.0 to 5.0 m2/g, a tap density of 1.0 to 2.0 g/cm3, and an oil absorption amount of 30 to 60 ml/100 g. For each of a plurality of primary particles having a primary particle size within a range of 0.1 to 1.0 μm among the primary particles, a coefficient of variation of the concentration of M1 is 1.5 or less, and the amount of M2 is 0.1 to 1.5 atom % with respect to the total number of atoms of Ni, Mn, and Co contained in the composite oxide particles.