公开(公告)号：US20250158054A1

公开(公告)日：2025-05-15

申请号：US19023705

申请日：2025-01-16

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jyo SAITO ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Teruaki OCHIAI ,  Tatsuyoshi TAKAHASHI ,  Kazuhei NARITA

IPC: H01M4/525 ,  H01M4/02 ,  H01M4/36 ,  H01M10/0525 ,  H01M10/0569

Abstract: A positive electrode active material that has high capacity and excellent charge and discharge cycle performance for a secondary battery is provided. A positive electrode active material that inhibits a decrease in capacity in charge and discharge cycles is provided. A high-capacity secondary battery is provided. A secondary battery with excellent charge and discharge characteristics is provided. A highly safe or reliable secondary battery is provided. A positive electrode active material contains lithium, cobalt, oxygen, and aluminum and has a crystal structure belonging to a space group R-3m when Rietveld analysis is performed on a pattern obtained by powder X-ray diffraction. In analysis by X-ray photoelectron spectroscopy, the number of aluminum atoms is less than or equal to 0.2 times the number of cobalt atoms.

公开(公告)号：US20220059830A1

公开(公告)日：2022-02-24

申请号：US17274880

申请日：2019-09-17

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Teruaki OCHIAI ,  Mayumi MIKAMI ,  Jyo SAITO

IPC: H01M4/505 ,  C01G53/00 ,  H01M4/525 ,  H01M4/36 ,  H01M10/0525 ,  H01M50/204 ,  H01M50/249

Abstract: A positive electrode material for a lithium-ion secondary battery which has high capacity and excellent charge and discharge cycle performance, and a manufacturing method thereof are provided, or a method of manufacturing a positive electrode material with high productivity is provided. The positive electrode material for a lithium-ion secondary battery includes a crystal represented by a crystal structure with a space group R-3m, a first region, and a second region, which is in contact with at least part of an outer side of the first region and whose outer edge corresponds to a surface of the first particle. The ratio of manganese atoms to cobalt atoms in the first region is lower than the ratio of manganese atoms to cobalt atoms in the second region. The ratio of fluorine atoms to oxygen atoms in the first region is lower than the ratio of fluorine atoms to oxygen atoms in the second region.

公开(公告)号：US20250105277A1

公开(公告)日：2025-03-27

申请号：US18970314

申请日：2024-12-05

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Mayumi MIKAMI ,  Teruaki OCHIAI ,  Kazuhei NARITA ,  Jyo SAITO

IPC: H01M4/525 ,  B60L58/12 ,  H01M4/38 ,  H01M4/58 ,  H01M10/0525 ,  H01M10/42 ,  H05K5/00

Abstract: A positive electrode active material for a lithium ion secondary battery which has a large capacity and a good charge-and-discharge cycle performance is provided. The positive electrode active material includes lithium, cobalt, oxygen, and magnesium, and has a compound represented by a layered rock-salt crystal structure. A space group of the compound is represented by R-3m. The compound is a composite oxide in which magnesium is substituted for a lithium position and a cobalt position. The compound is a particle. The magnesium substituted for a lithium position and a cobalt position exists more in the region from the surface to 5 nm than in the region deeper than 10 nm from the surface. More magnesium is substituted for a lithium position than for a cobalt position.

公开(公告)号：US20220029159A1

公开(公告)日：2022-01-27

申请号：US17312082

申请日：2019-12-02

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Jyo SAITO ,  Teruaki OCHIAI ,  Kazuhei NARITA ,  Kazuhito MACHIKAWA ,  Mayumi MIKAMI

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/36 ,  C01G53/00

Abstract: An object is to provide a method for manufacturing a positive electrode active material that achieves high powder properties and high load resistance (e.g., rate performance and output resistance) when used in a lithium-ion secondary battery, within a short manufacturing cycle time and at low cost. To perform heat treatment at temperatures lower than the melting point of magnesium fluorine, lithium fluoride is mixed to melt magnesium fluorine and modify the surface of lithium cobalt oxide powder. By mixing lithium fluoride, magnesium fluorine can be melted at a temperature lower than its melting point, and a positive electrode active material is formed utilizing this eutectic phenomenon.

公开(公告)号：US20220020981A1

公开(公告)日：2022-01-20

申请号：US17292471

申请日：2019-11-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Mayumi MIKAMI ,  Teruaki OCHIAI ,  Kazuhei NARITA ,  Jyo SAITO

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/38 ,  H01M4/58 ,  B60L58/12

Abstract: A positive electrode active material for a lithium ion secondary battery which has a large capacity and a good charge-and-discharge cycle performance is provided. The positive electrode active material includes lithium, cobalt, oxygen, and magnesium, and has a compound represented by a layered rock-salt crystal structure. A space group of the compound is represented by R-3m. The compound is a composite oxide in which magnesium is substituted for a lithium position and a cobalt position. The compound is a particle. The magnesium substituted for a lithium position and a cobalt position exists more in the region from the surface to 5 nm than in the region deeper than 10 nm from the surface. More magnesium is substituted for a lithium position than for a cobalt position.