公开(公告)号：US11961994B2

公开(公告)日：2024-04-16

申请号：US17588556

申请日：2022-01-31

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya Ikenuma ,  Yumiko Yoneda

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

CPC classification number: H01M4/133 ,  C01B32/184 ,  H01M4/0416 ,  H01M4/049 ,  H01M4/1393 ,  H01M4/587 ,  H01M4/625 ,  Y02E60/10 ,  Y02E60/13

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：US10367188B2

公开(公告)日：2019-07-30

申请号：US15538049

申请日：2015-12-25

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：US09882211B2

公开(公告)日：2018-01-30

申请号：US14704508

申请日：2015-05-05

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro Kawakami ,  Tatsuya Ikenuma ,  Teruaki Ochiai ,  Shuhei Yoshitomi ,  Mako Motoyoshi ,  Hiroyuki Miyake ,  Yohei Momma ,  Takuya Hirohashi ,  Satoshi Seo

IPC: H01M4/36 ,  H01M4/485 ,  H01M4/48 ,  H01M4/62 ,  H01M4/583 ,  G06F1/16 ,  H01M4/505 ,  G04G21/00 ,  H01M4/525 ,  H01M10/052

CPC classification number: H01M4/485 ,  G04C10/00 ,  G04G21/00 ,  G06F1/16 ,  G06F1/1626 ,  G06F1/163 ,  G06F1/1635 ,  G06F1/1652 ,  H01M4/366 ,  H01M4/483 ,  H01M4/505 ,  H01M4/525 ,  H01M4/583 ,  H01M4/623 ,  H01M4/625 ,  H01M10/052 ,  H01M2220/30

Abstract: A lithium-ion secondary battery with high capacity is provided. Alternatively, a lithium-ion secondary battery with improved cycle characteristics is provided. To achieve this, an active material including a particle having a cleavage plane and a layer containing carbon covering at least part of the cleavage plane is provided. The particle having the cleavage plane contains lithium, manganese, nickel, and oxygen. The layer containing carbon preferably contains graphene. When a lithium-ion secondary battery is fabricated using an electrode including the particle having the cleavage plane at least part of which is covered with the layer containing carbon as an active material, the discharge capacity can be increased and the cycle characteristics can be improved.

公开(公告)号：US10529977B2

公开(公告)日：2020-01-07

申请号：US14836420

申请日：2015-08-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya Ikenuma ,  Yumiko Yoneda

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

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：US10454102B2

公开(公告)日：2019-10-22

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 ,  H01M10/05 ,  H01M4/04 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/505 ,  H01M4/587 ,  H01M10/0525 ,  H01M4/02

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.

公开(公告)号：US09728770B2

公开(公告)日：2017-08-08

申请号：US14887370

申请日：2015-10-20

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya Ikenuma

IPC: H01M4/04 ,  H01M4/62 ,  H01M10/052

CPC classification number: H01M4/0438 ,  H01M4/0416 ,  H01M4/0471 ,  H01M4/625 ,  H01M10/052 ,  Y02E60/122 ,  Y02P70/54

Abstract: In manufacture of a storage battery electrode containing graphene as a conductive additive, the efficiency of reduction of graphene oxide is reduced with high efficiency under mild conditions, and cycle characteristics and rate characteristics of a storage battery are improved. Provided is a manufacturing method of a storage battery electrode. In the manufacturing method, a paste containing an active material, a binder, graphene oxide, and a solvent is formed; the paste is applied to a current collector and the solvent contained in the paste is evaporated to form an active material layer; the active material layer is immersed in a liquid containing alcohol; and the active material layer is taken out from the liquid and heated so that the graphene oxide is reduced.

公开(公告)号：US11881578B2

公开(公告)日：2024-01-23

申请号：US18085682

申请日：2022-12-21

Applicant: Semiconductor Energy Laboratory Co., Ltd.

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

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

CPC classification number: H01M4/0404 ,  H01M4/0471 ,  H01M4/13 ,  H01M4/139 ,  H01M4/625 ,  H01M2220/30

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：US11735738B2

公开(公告)日：2023-08-22

申请号：US17511108

申请日：2021-10-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya Ikenuma

IPC: H01M4/62 ,  H01M4/04 ,  H01M4/66 ,  H01M4/139 ,  H01M10/052 ,  H01M4/13

CPC classification number: H01M4/623 ,  H01M4/0404 ,  H01M4/049 ,  H01M4/13 ,  H01M4/139 ,  H01M4/625 ,  H01M4/663 ,  H01M4/666 ,  H01M4/667 ,  H01M10/052 ,  H01M4/661 ,  Y02E60/10 ,  Y02T10/70

Abstract: An electrode improved for achieving a storage battery having both a high electrode strength and favorable electrode conductivity is provided. The electrode includes graphene and a modified polymer in an active material layer or includes a layer substantially formed of carbon particles and an active material layer including a modified polymer over a current collector. The modified polymer has a poly(vinylidene fluoride) structure and partly has a polyene structure or an aromatic ring structure. The polyene structure or the aromatic ring structure is sandwiched between poly(vinylidene fluoride) structures.

公开(公告)号：US11165066B2

公开(公告)日：2021-11-02

申请号：US14722795

申请日：2015-05-27

Applicant: Semiconductor Energy Laboratory Co., LTD.

Inventor： Tatsuya Ikenuma

IPC: H01M4/62 ,  H01M10/052 ,  H01M4/13 ,  H01M4/133 ,  H01M4/04

Abstract: An electrode improved for achieving a storage battery having both a high electrode strength and favorable electrode conductivity is provided. The electrode includes graphene and a modified polymer in an active material layer or includes a layer substantially formed of carbon particles and an active material layer including a modified polymer over a current collector. The modified polymer has a poly(vinylidene fluoride) structure and partly has a polyene structure or an aromatic ring structure. The polyene structure or the aromatic ring structure is sandwiched between poly(vinylidene fluoride) structures.

公开(公告)号：US10354810B2

公开(公告)日：2019-07-16

申请号：US14645090

申请日：2015-03-11

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya Ikenuma ,  Kazutaka Kuriki ,  Ai Nakagawa

IPC: H01G11/30 ,  H01G11/38 ,  H01G11/40 ,  H01G11/86 ,  H01M4/13 ,  H01M4/1393 ,  H01M4/133 ,  H01M4/36 ,  H01M4/58 ,  H01M4/587 ,  H01M4/62 ,  H01M4/04 ,  G06F1/16 ,  H01M4/02

Abstract: The cycle performance of a lithium-ion secondary battery or a lithium-ion capacitor can be obtained by minimizing the decomposition reaction of an electrolytic solution, etc. in the repeated charge and discharge cycles of the lithium-ion secondary battery or the lithium-ion capacitor. An electrode includes a current collector and an active material layer over the current collector. The active material layer includes active material particles, a conductive additive, a binder, and a film containing silicon oxide as its main component. The surface of one of the active material particles includes at least one of a region in contact with the surface of another active material particle, a region in contact with the conductive additive, and a region in contact with the binder. The surface of the active material particle except these regions is at least partly in contact with the film containing silicon oxide as its main component.