公开(公告)号：US11437622B2

公开(公告)日：2022-09-06

申请号：US17184074

申请日：2021-02-24

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yumiko Yoneda ,  Teppei Oguni ,  Takuya Miwa ,  Masaki Yamakaji ,  Ayae Tsuruta

IPC: H01M4/587 ,  H01M4/62 ,  C01B32/225 ,  C01B32/23 ,  H01M50/44 ,  H01M50/46 ,  H01M50/403 ,  H01M50/411 ,  H01M50/429 ,  H01M4/04 ,  H01M4/1393 ,  H01M4/36 ,  H01M10/0525 ,  H01M10/0587 ,  H01M10/052 ,  H01M4/133 ,  H01M4/02

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：US10770729B2

公开(公告)日：2020-09-08

申请号：US14988159

申请日：2016-01-05

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Ryota Tajima ,  Junpei Momo ,  Masaki Yamakaji

IPC: H01M2/02 ,  H01M4/62 ,  H01M10/04 ,  H01M4/13

Abstract: A flexible power storage device or a power storage device of which the capacity and cycle characteristics do not easily deteriorate even when the power storage device is curved is provided. An electrode in which an active material layer, a current collector, and a friction layer are stacked in this order is provided. Furthermore, a power storage device that includes the electrode as at least one of a positive electrode and a negative electrode is provided.

公开(公告)号：US10658701B2

公开(公告)日：2020-05-19

申请号：US15407283

申请日：2017-01-17

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Nobuhiro Inoue ,  Masaki Yamakaji ,  Jun Ishikawa ,  Kazuhei Narita

IPC: H01M10/0568 ,  H01M4/36 ,  H01M4/587 ,  H01M4/38 ,  H01M4/62 ,  H01M10/0525 ,  H01M10/054 ,  H01M4/02 ,  H01M10/42

Abstract: A storage battery includes positive and negative electrodes and an electrolytic solution. The negative electrode includes a first element and carbon. The first element is any of silicon, tin, gallium, aluminum, germanium, lead, antimony, bismuth, silver, zinc, cadmium, and indium. The negative electrode includes an active material and a first layer in contact with a surface of the active material. The first layer has a thickness of 10 nm to 1000 nm inclusive. The electrolytic solution contains first and second cations. The first cation is one or more of a lithium ion, a sodium ion, a calcium ion, and a magnesium ion. The second cation is an imidazolium cation or a tertiary sulfonium cation.

公开(公告)号：US10608290B2

公开(公告)日：2020-03-31

申请号：US14943070

申请日：2015-11-17

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masaki Yamakaji ,  Junpei Momo ,  Ryota Tajima ,  Takahiro Kasahara

IPC: H01M10/42 ,  H01M10/48 ,  H01M2/02 ,  H01M10/0525

Abstract: To provide a lithium-ion storage battery or electronic device that is flexible and highly safe. One embodiment of the present invention is a flexible storage battery including a positive electrode, a negative electrode, a separator between the positive electrode and the negative electrode, an exterior body that surrounds the positive electrode, the negative electrode, and the separator, and a wiring provided along the exterior body. At least part of the wiring is more easily breakable by deformation than the exterior body. The wiring is more vulnerable to deformation than the exterior body and thus damaged earlier than the exterior body. Damage to the wiring is detected and an alert is sent to a user; thus, the use of the storage battery can be stopped before the exterior body is damaged.

公开(公告)号：US20190067701A1

公开(公告)日：2019-02-28

申请号：US16170140

申请日：2018-10-25

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Hiroatsu Todoriki ,  Mikio Yukawa ,  Yumiko Saito ,  Masaki Yamakaji ,  Rika Yatabe ,  Tatsuya Ikenuma

IPC: H01M4/62 ,  H01M10/052 ,  H01M4/58 ,  C01B32/23 ,  H01M4/36 ,  H01M4/136

Abstract: A graphene oxide used as a raw material of a conductive additive for forming an active material layer with high electron conductivity with a small amount of a conductive additive is provided. A positive electrode for a nonaqueous secondary battery using the graphene oxide as a conductive additive is provided. The graphene oxide is used as a raw material of a conductive additive in a positive electrode for a nonaqueous secondary battery and, in the graphene oxide, the atomic ratio of oxygen to carbon is greater than or equal to 0.405.

公开(公告)号：US10164243B2

公开(公告)日：2018-12-25

申请号：US15342860

申请日：2016-11-03

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kuniharu Nomoto ,  Takuya Miwa ,  Masaki Yamakaji ,  Takahiro Kawakami

IPC: H01M4/583 ,  H01M4/58 ,  H01M4/1397 ,  H01M4/04 ,  H01M4/36 ,  H01M4/62 ,  H01M4/38 ,  H01M4/136 ,  H01M4/02

Abstract: An energy storage device having high capacity per weight or volume and a positive electrode active material for the energy storage device are manufactured. A surface of a main material included in the positive electrode active material for the energy storage device is coated with two-dimensional carbon. The main material included in the positive electrode active material is coated with a highly conductive material which has a structure expanding two-dimensionally and whose thickness is ignorable, whereby the amount of carbon coating can be reduced and an energy storage device having capacity close to theoretical capacity can be obtained even when a conduction auxiliary agent is not used or the amount of the conduction auxiliary agent is extremely small. Accordingly, the amount of carbon coating in a positive electrode and the volume of the conduction auxiliary agent can be reduced; consequently, the volume of the positive electrode can be reduced.

公开(公告)号：US11670807B2

公开(公告)日：2023-06-06

申请号：US17116678

申请日：2020-12-09

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masaki Yamakaji ,  Junpei Momo ,  Ryota Tajima ,  Takahiro Kasahara

IPC: H01M10/42 ,  H01M10/48 ,  H01M50/124 ,  H01M50/129 ,  H01M50/119 ,  H01M50/121 ,  H01M10/0525

CPC classification number: H01M10/425 ,  H01M10/48 ,  H01M10/488 ,  H01M50/119 ,  H01M50/121 ,  H01M50/124 ,  H01M50/129 ,  H01M10/0525 ,  H01M2220/30 ,  Y02E60/10

Abstract: To provide a lithium-ion storage battery or electronic device that is flexible and highly safe. One embodiment of the present invention is a flexible storage battery including a positive electrode, a negative electrode, a separator between the positive electrode and the negative electrode, an exterior body that surrounds the positive electrode, the negative electrode, and the separator, and a wiring provided along the exterior body. At least part of the wiring is more easily breakable by deformation than the exterior body. The wiring is more vulnerable to deformation than the exterior body and thus damaged earlier than the exterior body. Damage to the wiring is detected and an alert is sent to a user; thus, the use of the storage battery can be stopped before the exterior body is damaged.

公开(公告)号：US11515517B2

公开(公告)日：2022-11-29

申请号：US16710468

申请日：2019-12-11

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro Kawakami ,  Masaki Yamakaji ,  Mako Motoyoshi ,  Rika Yatabe

IPC: H01M4/1393 ,  H01M4/131 ,  H01M4/133 ,  H01M4/1391 ,  H01M4/36 ,  H01M4/62

Abstract: A positive electrode for a nonaqueous secondary battery including an active material layer which has sufficient electron conductivity with a low ratio of a conductive additive is provided. A positive electrode for a nonaqueous secondary battery including an active material layer which is highly filled with an active material, id est, including the active material and a low ratio of a conductive additive. The active material layer includes a plurality of particles of an active material with a layered rock salt structure, graphene that is in surface contact with the plurality of particles of the active material, and a binder.

公开(公告)号：US11108038B2

公开(公告)日：2021-08-31

申请号：US15193478

申请日：2016-06-27

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masaki Yamakaji ,  Takahiro Kawakami ,  Mako Motoyoshi ,  Rika Yatabe

IPC: H01M4/36 ,  H01M4/131 ,  H01M4/04 ,  H01M4/62 ,  H01M4/1391 ,  H01M4/136 ,  H01M4/1397 ,  H01M4/505 ,  H01M4/525 ,  H01M4/587 ,  H01M4/58 ,  H01M10/0525 ,  H01M10/052 ,  H01M4/02

Abstract: A positive electrode for a secondary battery which enables both good battery characteristics and electrode strength at a predetermined level, a secondary battery, and a method for fabricating the positive electrode for a secondary battery are provided. The positive electrode for a secondary battery includes a current collector and an active material layer over the current collector. The active material layer includes an active material, graphene, and a binder. A carbon layer is on a surface of the active material. The proportion of the graphene in the active material layer is greater than or equal to 0.1 wt % and less than or equal to 1.0 wt %.

公开(公告)号：US10707524B2

公开(公告)日：2020-07-07

申请号：US15719620

申请日：2017-09-29

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masaki Yamakaji

IPC: H01M10/0562 ,  C07F7/18 ,  H01M10/056 ,  C01B32/194 ,  C01B32/198 ,  C07D301/00 ,  C07D303/40 ,  H01M10/0525 ,  B82Y30/00 ,  B82Y40/00

Abstract: To provide a graphene compound having an insulating property and an affinity for lithium ions. To increase the molecular weight of a substituent included in a graphene compound. To provide a graphene compound including a chain group containing an ether bond or an ester bond. To provide a graphene compound including a substituent containing one or more branches. To provide a graphene compound including a substituent including at least one of an ester bond and an amide bond.