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    METHOD FOR FORMING COMPOSITE OXIDE AND METHOD FOR FORMING LITHIUM ION BATTERY
    1.
    发明申请
    METHOD FOR FORMING COMPOSITE OXIDE AND METHOD FOR FORMING LITHIUM ION BATTERY 有权

    公开(公告)号：US20240429381A1

    公开(公告)日：2024-12-26

    申请号：US18692527

    申请日：2022-09-09

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Jo SAITO ,  Atsushi KAWATSUKI ,  Yohei MOMMA ,  Shuhei YOSHITOMI ,  Kenta NAKANISHI ,  Tetsuya KAKEHATA

    IPC: H01M4/525 ,  C01G51/00 ,  H01M10/0525 ,  H01M10/0569

    Abstract: A method for forming a positive electrode active material that can be used for a lithium ion battery having excellent discharge characteristics even in a low-temperature environment is provided. The method includes a first step in which lithium cobalt oxide with a median diameter (D50) of less than or equal to 10 μm is heated at a temperature higher than or equal to 700° C. and lower than or equal to 1000° C. for longer than or equal to 1 hour and shorter than or equal to 5 hours, a second step in which a first mixture is formed by mixing a fluorine source and a magnesium source to the lithium cobalt oxide subjected to the first step, a third step in which the first mixture is heated at a temperature higher than or equal to 800° C. and lower than or equal to 1100° C. for longer than or equal to 1 hour and shorter than or equal to 10 hours, a fourth step in which a second mixture is formed by mixing a nickel source and an aluminum source to the first mixture subjected to the third step, and a fifth step in which the second mixture is heated at a temperature higher than or equal to 800° C. and lower than or equal to 950° C. for longer than or equal to 1 hour and shorter than or equal to 5 hours.

    METHOD OF FORMING POSITIVE ELECTRODE ACTIVE MATERIAL, KILN, AND HEATING FURNACE
    2.
    发明申请
    METHOD OF FORMING POSITIVE ELECTRODE ACTIVE MATERIAL, KILN, AND HEATING FURNACE 有权

    公开(公告)号：US20230014507A1

    公开(公告)日：2023-01-19

    申请号：US17782835

    申请日：2020-12-01

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

    IPC: F27B7/18 ,  H01M4/04 ,  F27B7/36 ,  F27B7/42 ,  F27D5/00 ,  C01G53/00

    Abstract: To provide a method of forming a positive electrode active material with high productivity. To provide a manufacturing apparatus capable of forming a positive electrode active material with high productivity. Provided is a method of forming a positive electrode active material including lithium, a transition metal, oxygen, and fluorine. An adhesion preventing step is performed during heating of an object. Examples of the adhesion preventing step include stirring by rotating a furnace during the heating, stirring by vibrating a container containing an object during the heating, and crushing performed between the plurality of heating steps. By these manufacturing methods, a positive electrode active material having favorable distribution of an additive at the surface portion can be formed.

    METHOD FOR ESTIMATING INTERNAL RESISTANCE OF SECONDARY BATTERY AND ANOMALY DETECTION SYSTEM OF SECONDARY BATTERY
    4.
    发明申请
    METHOD FOR ESTIMATING INTERNAL RESISTANCE OF SECONDARY BATTERY AND ANOMALY DETECTION SYSTEM OF SECONDARY BATTERY 有权

    公开(公告)号：US20220260643A1

    公开(公告)日：2022-08-18

    申请号：US17612323

    申请日：2020-05-15

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Jo SAITO ,  Mayumi MIKAMI

    IPC: G01R31/389 ,  G01R31/367 ,  B60L58/12 ,  B60L7/18 ,  B60L3/00

    Abstract: An electric automobile incorporating a secondary battery has a disadvantage such as a difficulty in knowing the remaining capacity accurately and in predicting the time when the remaining capacity becomes zero because of deterioration of the secondary battery. The internal resistance is estimated with high accuracy even when the secondary battery deteriorates. Data used for learning or estimation is a data group (also referred to as data with regenerative charging) that is limited to data acquired within a certain time range around the end of regenerative charging. Such data within the limited range is extracted, used for learning, and subjected to the estimation. Thus, a value of the internal resistance can be output with high accuracy, specifically, with a mean error rate of 1% or less.

    METHOD FOR MANUFACTURING POSITIVE ELECTRODE ACTIVE MATERIAL
    6.
    发明申请
    METHOD FOR MANUFACTURING POSITIVE ELECTRODE ACTIVE MATERIAL 有权

    公开(公告)号：US20220181619A1

    公开(公告)日：2022-06-09

    申请号：US17601250

    申请日：2020-03-30

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Yohei MOMMA ,  Teruaki OCHIAI ,  Mayumi MIKAMI ,  Kazuhito MACHIKAWA ,  Jo SAITO

    IPC: H01M4/525 ,  H01M4/36 ,  H01M4/04 ,  H01M4/505 ,  H01M4/58

    Abstract: Provided is a positive electrode active material that achieves improvement in load resistance such as rate performance and output resistance when used as a positive electrode active material in a lithium-ion secondary battery, achieves improvement in powder properties, has a short manufacturing cycle time, and is low in cost. The positive electrode active material is manufactured by a first step of forming a first mixture by separately pulverizing a compound containing one or more elements selected from magnesium, calcium, zirconium, lanthanum, and barium; a compound containing halogen and an alkali metal; and a fluoride containing one or more metals selected from nickel, aluminum, manganese, titanium, vanadium, iron, and chromium, and then mixing them with metal oxide powder; and a second step of performing heating at a temperature higher than or equal to 700° C. and lower than or equal to 950° C.

    POSITIVE ELECTRODE ACTIVE MATERIAL, SECONDARY BATTERY, AND ELECTRONIC DEVICE
    9.
    发明申请
    POSITIVE ELECTRODE ACTIVE MATERIAL, SECONDARY BATTERY, AND ELECTRONIC DEVICE 有权

    公开(公告)号：US20230052866A1

    公开(公告)日：2023-02-16

    申请号：US17788844

    申请日：2020-12-15

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Mayumi MIKAMI ,  Jo SAITO ,  Teruaki OCHIAI ,  Yohei MOMMA ,  Yoshimi NAKASHIMA ,  Yoshiharu ASADA ,  Kazuki TANEMURA

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

    Abstract: A positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. A positive electrode active material with high charge and discharge capacity is provided. A positive electrode active material including lithium, cobalt, nickel, magnesium, and oxygen, in which the a-axis lattice constant of an outermost surface layer of the positive electrode active material is larger than the a-axis lattice constant of an inner portion and in which the c-axis lattice constant of the outermost surface layer is larger than the c-axis lattice constant of the inner portion. A rate of change between the a-axis lattice constant of the outermost surface layer and the a-axis lattice constant of the inner portion is preferably larger than 0 and less than or equal to 0.12, and a rate of change between the c-axis lattice constant of the outermost surface layer and the c-axis lattice constant of the inner portion is preferably larger than 0 and less than or equal to 0.18.

    POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE, SECONDARY BATTERY, AND MANUFACTURING METHOD THEREOF
    10.
    发明申请
    POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE, SECONDARY BATTERY, AND MANUFACTURING METHOD THEREOF 有权

    公开(公告)号：US20220371906A1

    公开(公告)日：2022-11-24

    申请号：US17621792

    申请日：2020-06-16

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

    IPC: C01D15/02 ,  H01M10/0525 ,  H01M4/40 ,  C01G51/00 ,  C01G53/00 ,  C01F7/162 ,  C01F7/78

    Abstract: A positive electrode active material that has high capacity and excellent charge and discharge cycle performance for a secondary battery is provided. The positive electrode active material includes a group of particles including a first group of particles and a second group of particles. The group of particles includes lithium, cobalt, nickel, aluminum, magnesium, oxygen, and fluorine. When the number of cobalt atoms included in the group of particles is taken as 100, the number of nickel atoms is greater than or equal to 0.05 and less than or equal to 2, the number of aluminum atoms is greater than or equal to 0.05 and less than or equal to 2, and the number of magnesium atoms is greater than or equal to 0.1 and less than or equal to 6. When particle size distribution in the group of particles is measured by a laser diffraction and scattering method, the first group of particles has a first peak and the second group of particles has a second peak; the first peak has a local maximum value at longer than or equal to 2 μm and shorter than or equal to 4 μm, and the second peak has a local maximum value at longer than or equal to 9 μm and shorter than or equal to 25 μm.

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