公开(公告)号：US10749174B2

公开(公告)日：2020-08-18

申请号：US16114312

申请日：2018-08-28

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro Kawakami ,  Teruaki Ochiai ,  Shuhei Yoshitomi ,  Takuya Hirohashi ,  Mako Motoyoshi ,  Yohei Momma ,  Junya Goto

IPC: H01M4/13 ,  H01M4/505 ,  H01M4/36 ,  H01M4/131 ,  H01M4/1391

Abstract: To increase capacity per weight of a power storage device, a particle includes a first region, a second region in contact with at least part of a surface of the first region and located on the outside of the first region, and a third region in contact with at least part of a surface of the second region and located on the outside of the second region. The first and the second regions contain lithium and oxygen. At least one of the first region and the second region contains manganese. At least one of the first and the second regions contains an element M. The first region contains a first crystal having a layered rock-salt structure. The second region contains a second crystal having a layered rock-salt structure. An orientation of the first crystal is different from an orientation of the second crystal.

公开(公告)号：US10581060B2

公开(公告)日：2020-03-03

申请号：US15046877

申请日：2016-02-18

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Junpei Momo ,  Yohei Momma

IPC: H01M4/04 ,  H01M10/0525 ,  H01M4/485 ,  H01M4/587

Abstract: A lithium-ion secondary battery having stable charge characteristics and lifetime characteristics is manufactured. Before the secondary battery is completed, a positive electrode is subjected to an electrochemical reaction in a large amount of electrolyte solution in advance, so that the positive electrode can have stability. The use of the positive electrode enables the secondary battery to be highly reliable. If a negative electrode is also subjected to an electrochemical reaction in a large amount of electrolyte solution in advance, the secondary battery can be more highly reliable.

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：US10235961B2

公开(公告)日：2019-03-19

申请号：US15159036

申请日：2016-05-19

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Yohei Momma ,  Takahiro Kawakami ,  Junpei Momo

IPC: H01B13/00 ,  H05K1/11 ,  G09G3/36 ,  G06F3/044 ,  G06F3/041 ,  G02F1/1343 ,  G02F1/1333

Abstract: A novel element, a novel formation method of a film, or a novel formation method of an element is provided. Alternatively, a film including graphene is formed at low cost and high yield. A formation method of a film including graphene includes a first step of forming a film including graphene oxide that includes a first region and a second region by application of a dispersion liquid in which graphene oxide is dispersed over a substrate and removal of dispersion medium from the applied dispersion liquid, a second step of forming a film including graphene by light irradiation to the first region to reduce the first region, and a third step of removing the second region by washing.

公开(公告)号：US09666326B2

公开(公告)日：2017-05-30

申请号：US14272718

申请日：2014-05-08

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro Kawakami ,  Shuhei Yoshitomi ,  Teruaki Ochiai ,  Satoshi Seo ,  Yohei Momma ,  Yumiko Saito

IPC: H01B1/08 ,  H01M4/36 ,  H01M4/131 ,  H01M4/505 ,  C01G45/12

CPC classification number: H01B1/08 ,  C01G45/1242 ,  C01G45/1257 ,  C01P2002/72 ,  C01P2002/76 ,  C01P2004/80 ,  C01P2006/40 ,  H01M4/131 ,  H01M4/364 ,  H01M4/366 ,  H01M4/505 ,  Y02P70/54

Abstract: To increase the amount 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 composite material of crystallites of LiMn2O4 (crystallites with a spinel crystal structure) and crystallites of Li2MnO3 (crystallites with a layered rock-salt crystal structure) is used as a positive electrode active material. The lithium manganese oxide composite has high structural stability and high capacity.

公开(公告)号：US12272822B2

公开(公告)日：2025-04-08

申请号：US16624319

申请日：2018-06-14

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masahiro Takahashi ,  Mayumi Mikami ,  Yohei Momma ,  Teruaki Ochiai ,  Jyo Saitou

IPC: H01M4/525 ,  C01G51/66 ,  C01G53/66 ,  H01M4/13915 ,  H01M10/0525 ,  C01G45/1214 ,  C01G51/42 ,  C01G53/44 ,  H01M4/02 ,  H01M4/1315

Abstract: A positive electrode active material has a small difference in a crystal structure between the charged state and the discharged state. For example, the crystal structure and volume of the positive electrode active material, which has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of approximately 4.6 V, are less likely to be changed by charging and discharging as compared with those of a known positive electrode active material. In order to form the positive electrode active material having the pseudo-spinel crystal structure in the charged state, it is preferable that a halogen source such as a fluorine and a magnesium source be mixed with particles of a composite oxide containing lithium, a transition metal, and oxygen, which is synthesized in advance, and then the mixture be heated at an appropriate temperature for an appropriate time.

公开(公告)号：US12244007B2

公开(公告)日：2025-03-04

申请号：US18608249

申请日：2024-03-18

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei Momma ,  Hiroshi Kadoma ,  Yoshihiro Komatsu ,  Shiori Saga ,  Shunpei Yamazaki

IPC: H01M4/36 ,  H01M4/485 ,  H01M4/525 ,  H01M4/58 ,  H01M10/0525 ,  H01M4/02

Abstract: A positive electrode active material in which a capacity decrease caused by charge and discharge cycles is suppressed is provided. Alternatively, a positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. The positive electrode active material contains titanium, nickel, aluminum, magnesium, and fluorine, and includes a region where titanium is unevenly distributed, a region where nickel is unevenly distributed, and a region where magnesium is unevenly distributed in a projection on its surface. Aluminum is preferably unevenly distributed in a surface portion, not in the projection, of the positive electrode active material.

公开(公告)号：US12142759B2

公开(公告)日：2024-11-12

申请号：US17291463

申请日：2019-11-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi Mikami ,  Yohei Momma ,  Teruaki Ochiai

IPC: H01M4/525 ,  H01M4/02 ,  H01M4/505 ,  H01M10/0525

Abstract: A positive electrode active material with high capacity and excellent charging and discharging cycle performance for a lithium-ion secondary battery is provided. The positive electrode active material contains lithium, cobalt, and oxygen, and the spin density attributed to a bivalent cobalt ion and a tetravalent cobalt ion is within a predetermined range. It is preferable that the positive electrode active material further contain magnesium. An appropriate magnesium concentration is represented as a concentration with respect to cobalt. It is also preferable that the positive electrode active material further contain fluorine.

公开(公告)号：US11936036B2

公开(公告)日：2024-03-19

申请号：US16952189

申请日：2020-11-19

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei Momma ,  Hiroshi Kadoma ,  Yoshihiro Komatsu ,  Shiori Saga ,  Shunpei Yamazaki

IPC: H01M4/36 ,  H01M4/485 ,  H01M4/525 ,  H01M4/58 ,  H01M10/0525 ,  H01M4/02

CPC classification number: H01M4/366 ,  H01M4/485 ,  H01M4/525 ,  H01M4/582 ,  H01M10/0525 ,  H01M2004/028

Abstract: A positive electrode active material in which a capacity decrease caused by charge and discharge cycles is suppressed is provided. Alternatively, a positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. The positive electrode active material contains titanium, nickel, aluminum, magnesium, and fluorine, and includes a region where titanium is unevenly distributed, a region where nickel is unevenly distributed, and a region where magnesium is unevenly distributed in a projection on its surface. Aluminum is preferably unevenly distributed in a surface portion, not in the projection, of the positive electrode active material.

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.