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    Graphene compound, method for forming graphene compound, and lithium-ion storage battery
    4.
    发明授权
    Graphene compound, method for forming graphene compound, and lithium-ion storage battery 有权

    公开(公告)号：US11024878B2

    公开(公告)日：2021-06-01

    申请号：US16544958

    申请日：2019-08-20

    申请人： SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    发明人： Hiroshi Kadoma ,  Teppei Oguni ,  Satoshi Seo

    IPC分类号： H01M10/0565 ,  C01B32/194 ,  C01B32/23 ,  C01B32/198 ,  H01M10/0585 ,  H01M50/116 ,  H01M10/0525

    摘要： A material that can be used in a wide temperature range is provided. A graphene compound includes graphene or graphene oxide and a substituted or unsubstituted chain group, the chain group includes two or more ether bonds, and the chain group is bonded to the above graphene or graphene oxide through a Si atom. Alternatively, a method for forming a graphene compound includes a first step and a second step after the first step. In the first step, graphene oxide and a base are stirred under a nitrogen stream. In the second step, the mixture is cooled to room temperature, a silylating agent that has a group having two or more ether bonds is introduced into the mixture, and the obtained mixture is stirred. The base is butylamine, pentylamine, hexylamine, diethylamine, dipropylamine, dibutylamine, triethylamine, tripropylamine, or pyridine.

    Method for manufacturing positive electrode active material, and lithium ion battery
    5.
    发明授权
    Method for manufacturing positive electrode active material, and lithium ion battery 有权

    公开(公告)号：US10985369B2

    公开(公告)日：2021-04-20

    申请号：US16893726

    申请日：2020-06-05

    申请人： SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    发明人： Takuya Miwa ,  Yumiko Yoneda ,  Teppei Oguni

    IPC分类号： H01M4/58 ,  C01B25/45 ,  H01M4/02 ,  H01M10/0525

    摘要： A composite oxide with high diffusion rate of lithium is provided. Alternatively, a lithium-containing complex phosphate with high diffusion rate of lithium is provided. Alternatively, a positive electrode active material with high diffusion rate of lithium is provided. Alternatively, a lithium ion battery with high output is provided. Alternatively, a lithium ion battery that can be manufactured at low cost is provided. A positive electrode active material is formed through a first step of mixing a lithium compound, a phosphorus compound, and water, a second step of adjusting pH by adding a first aqueous solution to a first mixed solution formed in the first step, a third step of mixing an iron compound with a second mixed solution formed in the second step, a fourth step of performing heat treatment under a pressure more than or equal to 0.1 MPa and less than or equal to 2 MPa at a highest temperature more than 100° C. and less than or equal to 119° C. on a third mixed solution formed in the third step with a pH of more than or equal to 3.5 and less than or equal to 5.0.

    Electrode, power storage device, and electronic device
    7.
    发明授权
    Electrode, power storage device, and electronic device 有权

    公开(公告)号：US10230095B2

    公开(公告)日：2019-03-12

    申请号：US15156524

    申请日：2016-05-17

    申请人： Semiconductor Energy Laboratory Co., LTD.

    发明人： Kai Kimura ,  Tatsuya Ikenuma ,  Nobuhiro Inoue ,  Teppei Oguni

    IPC分类号： H01M4/133 ,  H01M4/36 ,  H01M4/587 ,  H01M4/62 ,  H01M10/0525 ,  H01M4/134 ,  H01M4/38 ,  H01M10/052 ,  H01M4/02

    摘要： To provide a power storage device with a high capacity. To provide a power storage device with a high energy density. To provide a highly reliable power storage device. To provide a long-life power storage device. To provide an electrode with a high capacity. To provide an electrode with a high energy density. To provide a highly reliable electrode. To provide a long-life electrode. The power storage device includes a first electrode and a second electrode. The first electrode includes a first current collector and a first active material layer. The first active material layer includes a first active material and a first binder. The first active material is graphite. A separation strength F of the first electrode that is measured when the first active material layer is separated from the first current collector after the first electrode is immersed in a solution at a temperature higher than or equal to 20° C. and lower than or equal to 70° C. for longer than or equal to three hours is higher than or equal to 0.05 N/cm and lower than or equal to 5 N/cm per unit width of a sample that is separated.