公开(公告)号：US20190319268A1

公开(公告)日：2019-10-17

申请号：US16454116

申请日：2019-06-27

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yumiko YONEDA ,  Teppei OGUNI ,  Takuya MIWA ,  Masaki YAMAKAJI ,  Ayae TSURUTA

IPC: H01M4/587 ,  C01B32/23 ,  C01B32/225 ,  H01M10/0587 ,  H01M10/0525 ,  H01M4/1393 ,  H01M2/16 ,  H01M4/62 ,  H01M4/04 ,  H01M4/36 ,  H01M2/14

Abstract: To provide a manufacturing method of graphene oxide that allows mass production through a relatively simple process, at low costs, and with safety and efficiency. A hydrogen peroxide solution, sulfuric acid, and flake graphite are put in a reaction container, and the mixture is stirred to obtain expansion graphite. The synthesized expansion graphite is washed not with pure water but with a saturated aqueous solution of magnesium sulfate (MgSO4) or an organic solvent, whereby a large amount of sulfuric acid is contained between graphite layers. The expansion graphite is subjected to heat treatment or microwave irradiation to form expanded graphite, and a graphite layer is peeled by ultrasonic treatment and then oxidized to form a graphene compound.

公开(公告)号：US20180076482A1

公开(公告)日：2018-03-15

申请号：US15818814

申请日：2017-11-21

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Yumiko YONEDA ,  Masaki YAMAKAJI ,  Ryota TAJIMA ,  Masaaki HIROKI

IPC: H01M10/0565 ,  H01M4/13 ,  H01M4/02 ,  H01M10/04 ,  H01M10/052 ,  H01M10/0585

CPC classification number: H01M10/0565 ,  H01M2/0275 ,  H01M4/02 ,  H01M4/13 ,  H01M10/0436 ,  H01M10/052 ,  H01M10/0585 ,  H01M2300/0085 ,  Y02T10/7011

Abstract: A gel electrolyte and a separator are provided between the positive electrode current collector and the negative electrode current collector. The plurality of positive electrode current collectors and the plurality of negative electrode current collectors are stacked such that surfaces of negative electrodes with which active material layers are not coated or surfaces of positive electrodes with which active material layers are not coated are in contact with each other.

公开(公告)号：US20170317346A1

公开(公告)日：2017-11-02

申请号：US15649179

申请日：2017-07-13

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya IKENUMA ,  Shuhei YOSHITOMI ,  Takahiro KAWAKAMI ,  Yumiko YONEDA ,  Yohei MOMMA

IPC: H01M4/36 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/04 ,  H01M4/505 ,  H01M4/587 ,  H01M10/0525 ,  H01M4/02

CPC classification number: H01M4/366 ,  H01M4/0402 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/505 ,  H01M4/587 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/028 ,  Y02T10/7011

Abstract: To increase the volume density or weight density of lithium ions that can be received and released in and from a positive electrode active material to achieve high capacity and high energy density of a secondary battery. A lithium manganese composite oxide represented by LixMnyMzOw that includes a region belonging to a space group C2/c and is covered with a carbon-containing layer is used as the positive electrode active material. The element M is an element other than lithium and manganese. The lithium manganese composite oxide has high structural stability and high capacity.