公开(公告)号：US12218337B2

公开(公告)日：2025-02-04

申请号：US17350248

申请日：2021-06-17

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya Ikenuma ,  Kazutaka Kuriki

IPC: H01M4/13 ,  H01M4/04 ,  H01M4/139 ,  H01M4/36 ,  H01M4/62 ,  H01M10/42 ,  H01M10/052

Abstract: To provide a highly reliable power storage device. To provide a long-life power storage device. To provide a power storage device electrode having high adhesion with a current collector. To reduce or inhibit electrochemical decomposition of an electrolytic solution or the like on a surface of an electrode. The power storage device electrode includes a current collector and a second electrode layer provided over the current collector and including a second binder and an active material. A first electrode layer including a first binder and conductive particles is provided between the current collector and the second electrode layer. At least part of a surface of the active material is provided with a coating film, and the coating film is porous.

公开(公告)号：US11967710B2

公开(公告)日：2024-04-23

申请号：US17152830

申请日：2021-01-20

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya Ikenuma

IPC: H01M4/505 ,  H01M4/04 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/36 ,  H01M4/62 ,  H01M10/0525

CPC classification number: H01M4/505 ,  H01M4/0404 ,  H01M4/0471 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/366 ,  H01M4/622 ,  H01M4/625 ,  H01M10/0525 ,  H01M2220/30 ,  Y02E60/10 ,  Y02P70/50

Abstract: As a positive electrode active material of a secondary battery, a lithium-manganese composite oxide containing lithium, manganese, and an element represented by M, and oxygen is used, and the lithium-manganese composite oxide is covered with reduced graphene oxide. An active material layer including the active material, graphene oxide, a conductive additive, and a binder is formed and soaked in alcohol, and then heat treatment is performed, whereby an electrode with reduced graphene oxide is fabricated.

公开(公告)号：US11545655B2

公开(公告)日：2023-01-03

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 ,  H01M4/62 ,  H01M4/139

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.

公开(公告)号：US10923706B2

公开(公告)日：2021-02-16

申请号：US16521650

申请日：2019-07-25

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Takahiro Kawakami ,  Yohei Momma ,  Teruaki Ochiai ,  Tatsuya Ikenuma

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

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.

公开(公告)号：US10608248B2

公开(公告)日：2020-03-31

申请号：US15856281

申请日：2017-12-28

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro Kawakami ,  Tatsuya Ikenuma ,  Satoshi Seo

IPC: H01M4/36 ,  H01M4/131 ,  H01M4/505 ,  H01M4/02 ,  H01M10/0525

Abstract: The volume density or weight density of lithium ions that can be received and released in and from a positive electrode active material is increased to achieve high capacity and high energy density of a secondary battery. In a lithium manganese composite oxide, each particle includes a first region including a crystal with a layered rock-salt crystal structure and a second region including a crystal with a spinel crystal structure. The second region is in contact with the outside of the first region. The lithium manganese composite oxide has high structural stability and high capacity.

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：US09865867B2

公开(公告)日：2018-01-09

申请号：US14492759

申请日：2014-09-22

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro Kawakami ,  Tatsuya Ikenuma ,  Satoshi Seo

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/131 ,  H01M10/0525 ,  H01M4/02

CPC classification number: H01M4/366 ,  H01M4/131 ,  H01M4/364 ,  H01M4/505 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/028 ,  H01M2220/30

Abstract: The volume density or weight density of lithium ions that can be received and released in and from a positive electrode active material is increased to achieve high capacity and high energy density of a secondary battery. In a lithium manganese composite oxide, each particle includes a first region including a crystal with a layered rock-salt crystal structure and a second region including a crystal with a spinel crystal structure. The second region is in contact with the outside of the first region. The lithium manganese composite oxide has high structural stability and high capacity.

公开(公告)号：US11322745B2

公开(公告)日：2022-05-03

申请号：US14879330

申请日：2015-10-09

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya Ikenuma ,  Kazutaka Kuriki ,  Ai Nakagawa

IPC: H01M4/62 ,  H01M4/139 ,  H01M4/36 ,  H01M4/13 ,  H01G11/06 ,  H01G11/50 ,  H01G11/38 ,  H01M10/0525

Abstract: Provided is an electrode including a current collector and an active material layer. The active material layer includes an active material, a film including silicone, a conductive additive, and a binder. The active material is in the form of a particle. The film including silicone covers at least part of the active material.

公开(公告)号：US11251415B2

公开(公告)日：2022-02-15

申请号：US16727984

申请日：2019-12-27

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya Ikenuma ,  Yumiko Yoneda

IPC: H01M4/133 ,  H01M4/04 ,  H01M4/587 ,  C01B32/184 ,  H01M4/62 ,  H01M4/1393

Abstract: To provide graphene oxide that has high dispersibility and is easily reduced. To provide graphene with high electron conductivity. To provide a storage battery electrode including an active material layer with high electric conductivity and a manufacturing method thereof. To provide a storage battery with increased discharge capacity. A method for manufacturing a storage battery electrode that is to be provided includes a step of dispersing graphene oxide into a solution containing alcohol or acid, a step of heating the graphene oxide dispersed into the solution, and a step or reducing the graphene oxide.

公开(公告)号：US20210143419A1

公开(公告)日：2021-05-13

申请号：US17152830

申请日：2021-01-20

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya Ikenuma

IPC: H01M4/505 ,  H01M10/0525 ,  H01M4/131 ,  H01M4/62 ,  H01M4/1391 ,  H01M4/04 ,  H01M4/36

Abstract: As a positive electrode active material of a secondary battery, a lithium-manganese composite oxide containing lithium, manganese, and an element represented by M, and oxygen is used, and the lithium-manganese composite oxide is covered with reduced graphene oxide. An active material layer including the active material, graphene oxide, a conductive additive, and a binder is formed and soaked in alcohol, and then heat treatment is performed, whereby an electrode with reduced graphene oxide is fabricated.