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    POSITIVE ELECTRODE ACTIVE MATERIAL, SECONDARY BATTERY, AND VEHICLE
    61.
    发明申请
    POSITIVE ELECTRODE ACTIVE MATERIAL, SECONDARY BATTERY, AND VEHICLE 有权

    公开(公告)号：US20230006203A1

    公开(公告)日：2023-01-05

    申请号：US17781178

    申请日：2020-11-25

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Yuji IWAKI ,  Tatsuyoshi TAKAHASHI ,  Yohei MOMMA ,  Shunpei YAMAZAKI

    IPC: H01M4/525 ,  C01G51/00 ,  B60L50/64

    Abstract: As for a secondary battery using lithium cobalt oxide as a positive electrode active material, the positive electrode active material with which a decrease in battery capacity due to repeated charge and discharge is inhibited is provided. Alternatively, a positive electrode active material particle which hardly deteriorates is provided. The positive electrode active material includes lithium, cobalt, oxygen, magnesium, aluminum, and fluorine and is a crystal represented by a layered rock-salt structure. The space group of the crystal is represented by R−3m. The concentration of fluorine in a surface portion of the crystal is higher than that inside the crystal. The concentration of magnesium in the surface portion of the crystal is higher than that inside the crystal. The atomic ratio of magnesium to aluminum in the surface portion of the crystal is higher than that inside the crystal.

    POSITIVE ELECTRODE ACTIVE MATERIAL, SECONDARY BATTERY, AND VEHICLE
    62.
    发明申请
    POSITIVE ELECTRODE ACTIVE MATERIAL, SECONDARY BATTERY, AND VEHICLE 有权

    公开(公告)号：US20220359870A1

    公开(公告)日：2022-11-10

    申请号：US17734744

    申请日：2022-05-02

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Mayumi MIKAMI ,  Jo SAITO ,  Kazuki TANEMURA ,  Tatsuyoshi TAKAHASHI ,  Yohei MOMMA ,  Kazuya SHIMADA ,  Kunihiro FUKUSHIMA

    IPC: H01M4/525

    Abstract: A positive electrode active material in which a discharge capacity decrease due to charge and discharge cycles is suppressed and a secondary battery including the positive electrode active material are provided. A positive electrode active material in which a change in a crystal structure, e.g., a shift in CoO2 layers is small between a discharged state and a high-voltage charged state is provided. For example, a positive electrode active material that has a layered rock-salt crystal structure belonging to the space group R-3m in a discharged state and a crystal structure belonging to the space group P2/m in a charged state where x in LixCoO2 is greater than 0.1 and less than or equal to 0.24 is provided. When the positive electrode active material is analyzed by powder X-ray diffraction, a diffraction pattern has at least diffraction peaks at 2θ of 19.47±0.10° and 2θ of 45.62±0.05°.

    METHOD FOR FORMING POSITIVE ELECTRODE ACTIVE MATERIAL
    63.
    发明申请
    METHOD FOR FORMING POSITIVE ELECTRODE ACTIVE MATERIAL 有权

    公开(公告)号：US20220173394A1

    公开(公告)日：2022-06-02

    申请号：US17441808

    申请日：2020-03-23

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

    IPC: H01M4/58 ,  H01M4/36 ,  H01M4/04 ,  H01M4/48

    Abstract: A method for forming a positive electrode active material of a lithium ion secondary battery is provided. The method for forming a positive electrode active material includes a first step of placing a first container in which a mixture of a lithium oxide, a fluoride, and a magnesium compound are put, in a heating furnace, a second step of providing an atmosphere including oxygen in an inside of the heating furnace, and a third step of heating the inside of the heating furnace. The third step is performed after the first step and the second step are performed. Preferably, an atmosphere including oxygen is provided in the heating furnace before the inside of the heating furnace is heated. More preferably, the fluoride is lithium fluoride and the magnesium compound is magnesium fluoride.

    ALL-SOLID-STATE BATTERY AND MANUFACTURING METHOD THEREOF
    64.
    发明申请
    ALL-SOLID-STATE BATTERY AND MANUFACTURING METHOD THEREOF 有权

    公开(公告)号：US20220115661A1

    公开(公告)日：2022-04-14

    申请号：US17424296

    申请日：2020-01-14

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Ryota TAJIMA ,  Yumiko YONEDA ,  Yohei MOMMA ,  Shunpei YAMAZAKI

    IPC: H01M4/583 ,  H01M10/0562 ,  H01M10/0525 ,  H01M4/38

    Abstract: Use of silicon as a negative electrode active material particle causes a problem of expansion and contraction of the negative electrode active material particle due to charging and discharging. A negative electrode active material particle or a plurality of negative electrode active material particles are bound or fixed using a graphene compound to inhibit expansion and contraction of the negative electrode active material particle due to charging and discharging. In an all-solid-state secondary battery, an interface between a solid electrolyte and a negative electrode or an interface between the solid electrolyte and a positive electrode has the highest resistance. In order to reduce the interface resistance, at least the negative electrode active material particle is surrounded by a graphene compound to increase the conductivity. Alternatively, a positive electrode active material particle is surrounded by a graphene compound to increase the conductivity. Carrier ions, e.g., lithium ions, pass through a graphene compound, and thus the graphene compound does not hinder the transfer of lithium ions between the positive electrode and the negative electrode in charging or discharging.

    STORAGE BATTERY ELECTRODE, MANUFACTURING METHOD THEREOF, STORAGE BATTERY, AND ELECTRONIC DEVICE
    65.
    发明申请
    STORAGE BATTERY ELECTRODE, MANUFACTURING METHOD THEREOF, STORAGE BATTERY, AND ELECTRONIC DEVICE 有权

    公开(公告)号：US20210167353A1

    公开(公告)日：2021-06-03

    申请号：US17171042

    申请日：2021-02-09

    Applicant: Semiconductor Energy Laboratory Co., Ltd.

    Inventor： Takahiro KAWAKAMI ,  Yohei MOMMA ,  Teruaki OCHIAI ,  Tatsuya IKENUMA

    IPC: H01M4/04 ,  H01M4/13 ,  H01M4/139 ,  H01M4/62

    Abstract: In manufacturing a storage battery electrode, a method for manufacturing a storage battery electrode with high capacity and stability is provided.
    As a method for preventing a mixture for forming an active material layer from becoming strongly basic, a first aqueous solution is formed by mixing an active material exhibiting basicity with an aqueous solution exhibiting acidity and including an oxidized derivative of a first conductive additive; a first mixture is formed by reducing the oxidized derivative of the first conductive additive by drying the first aqueous solution; a second mixture is formed by mixing a second conductive additive and a binder; a third mixture is formed by mixing the first mixture and the second mixture; and a current collector is coated with the third mixture. The strong basicity of the mixture for forming an active material layer is lowered; thus, the binder can be prevented from becoming gelled.

    METHOD FOR MANUFACTURING POSITIVE ELECTRODE ACTIVE MATERIAL, AND SECONDARY BATTERY
    66.
    发明申请
    METHOD FOR MANUFACTURING POSITIVE ELECTRODE ACTIVE MATERIAL, AND SECONDARY BATTERY 有权

    公开(公告)号：US20210020935A1

    公开(公告)日：2021-01-21

    申请号：US17036611

    申请日：2020-09-29

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Masahiro TAKAHASHI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Teruaki OCHIAI ,  Jyo SAITOU

    IPC: H01M4/525 ,  C01G51/00 ,  C01G53/00 ,  H01M10/0525

    Abstract: A positive electrode active material has a small difference in a crystal structure between the charged state and the discharged state. For example, the crystal structure and volume of the positive electrode active material, which has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of approximately 4.6 V, are less likely to be changed by charging and discharging as compared with those of a known positive electrode active material. In order to form the positive electrode active material having the pseudo-spinel crystal structure in the charged state, it is preferable that a halogen source such as a fluorine and a magnesium source be mixed with particles of a composite oxide containing lithium, a transition metal, and oxygen, which is synthesized in advance, and then the mixture be heated at an appropriate temperature for an appropriate time.

    POSITIVE ELECTRODE ACTIVE MATERIAL INCLUDING LITHIUM COBALTATE COATED WITH LITHIUM TITANATE AND MAGNESIUM OXIDE
    67.
    发明申请
    POSITIVE ELECTRODE ACTIVE MATERIAL INCLUDING LITHIUM COBALTATE COATED WITH LITHIUM TITANATE AND MAGNESIUM OXIDE 有权

    公开(公告)号：US20210020910A1

    公开(公告)日：2021-01-21

    申请号：US17064724

    申请日：2020-10-07

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Ayae TSURUTA

    IPC: H01M4/134 ,  H01M4/131 ,  H01M4/525 ,  H01M4/36 ,  H01M10/0525

    Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.

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