公开(公告)号：US12142765B2

公开(公告)日：2024-11-12

申请号：US17424296

申请日：2020-01-14

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Ryota Tajima ,  Yumiko Yoneda ,  Yohei Momma ,  Shunpei Yamazaki

IPC: H01M4/38 ,  H01M4/02 ,  H01M4/583 ,  H01M4/62 ,  H01M10/0525 ,  H01M10/0562

Abstract: Use of silicon as a negative electrode active material particle causes a problem of expansion and contraction of the negative electrode active material particle due to charging and discharging. A negative electrode active material particle or a plurality of negative electrode active material particles are bound or fixed using a graphene compound to inhibit expansion and contraction of the negative electrode active material particle due to charging and discharging. In an all-solid-state secondary battery, an interface between a solid electrolyte and a negative electrode or an interface between the solid electrolyte and a positive electrode has the highest resistance. In order to reduce the interface resistance, at least the negative electrode active material particle is surrounded by a graphene compound to increase the conductivity. Alternatively, a positive electrode active material particle is surrounded by a graphene compound to increase the conductivity. Carrier ions, e.g., lithium ions, pass through a graphene compound, and thus the graphene compound does not hinder the transfer of lithium ions between the positive electrode and the negative electrode in charging or discharging.

公开(公告)号：US11799080B2

公开(公告)日：2023-10-24

申请号：US16611791

申请日：2018-05-11

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Mayumi Mikami ,  Aya Uchida ,  Yumiko Yoneda ,  Yohei Momma ,  Masahiro Takahashi ,  Teruaki Ochiai

IPC: H01B1/08 ,  H01M4/525 ,  C01G53/00 ,  H01M4/131 ,  H01M4/133 ,  H01M4/134 ,  H01M4/36 ,  H01M4/505 ,  H01M6/16 ,  H01M10/0525 ,  H01M4/139 ,  H01M4/02

CPC classification number: H01M4/525 ,  C01G53/50 ,  H01B1/08 ,  H01M4/131 ,  H01M4/133 ,  H01M4/134 ,  H01M4/139 ,  H01M4/366 ,  H01M4/505 ,  H01M6/164 ,  H01M10/0525 ,  C01P2002/74 ,  H01M2004/028

Abstract: A positive electrode active material having high capacity and excellent cycle performance is provided. The 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 charge and discharge as compared with those of a known positive electrode active material.

公开(公告)号：US11710823B2

公开(公告)日：2023-07-25

申请号：US17852407

申请日：2022-06-29

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

CPC classification number: H01M4/505 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/366 ,  H01M2220/30

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：US11444274B2

公开(公告)日：2022-09-13

申请号：US16914539

申请日：2020-06-29

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masahiro Takahashi ,  Teruaki Ochiai ,  Yohei Momma ,  Ayae Tsuruta

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M4/02

Abstract: A positive electrode active material particle with little deterioration is provided. A power storage device with little deterioration is provided. A highly safe power storage device is provided. The positive electrode active material particle includes a first crystal grain, a second crystal grain; and a crystal grain boundary positioned between the crystal grain and the second crystal grain; the first crystal grain and the second crystal grain include lithium, a transition metal, and oxygen; the crystal grain boundary includes magnesium and oxygen; and the positive electrode active material particle includes a region where the ratio of the atomic concentration of magnesium in the crystal grain boundary to the atomic concentration of the transition metal in first crystal grain and the second crystal grain is greater than or equal to 0.010 and less than or equal to 0.50.

公开(公告)号：US10541372B2

公开(公告)日：2020-01-21

申请号：US16055612

申请日：2018-08-06

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Yohei Momma ,  Tomohiko Suganoya ,  Saki Obana

IPC: H01L33/00 ,  H01L51/00 ,  H01L51/56 ,  H01L33/52 ,  H01L27/12 ,  H01L27/32 ,  H01L51/52

Abstract: A light-emitting device having a curved light-emitting surface is provided. Further, a highly-reliable light-emitting device is provided. A substrate with plasticity is used. A light-emitting element is formed over the substrate in a flat state. The substrate provided with the light-emitting element is curved and put on a surface of a support having a curved surface. Then, a protective layer for protecting the light-emitting element is formed in the same state. Thus, a light-emitting device having a curved light-emitting surface, such as a lighting device or a display device can be manufactured.

公开(公告)号：US10249876B2

公开(公告)日：2019-04-02

申请号：US15874123

申请日：2018-01-18

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: H01M4/505 ,  H01M4/485 ,  H01M4/48 ,  H01M4/62 ,  H01M4/583 ,  G06F1/16 ,  G04G21/00 ,  G04C10/00 ,  H01M4/36 ,  H01M4/525 ,  H01M10/052

Abstract: A lithium-ion secondary battery with high capacity is provided. Alternatively, a lithium-ion secondary battery with unproved 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：US11843113B2

公开(公告)日：2023-12-12

申请号：US16702862

申请日：2019-12-04

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro Kawakami ,  Teruaki Ochiai ,  Yohei Momma ,  Ayae Tsuruta ,  Masahiro Takahashi ,  Mayumi Mikami

IPC: H01M4/36 ,  H01M4/04 ,  H01M4/62 ,  H01G11/24 ,  H01G11/86 ,  H01G11/50 ,  H01G11/60 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M4/02

CPC classification number: H01M4/366 ,  H01G11/24 ,  H01G11/50 ,  H01G11/60 ,  H01G11/86 ,  H01M4/0471 ,  H01M4/505 ,  H01M4/525 ,  H01M4/62 ,  H01M4/628 ,  H01M10/0525 ,  H01M2004/028

Abstract: Provided is a positive electrode active material which suppresses a reduction in capacity due to charge and discharge cycles when used in a lithium ion secondary battery. A covering layer is formed by segregation on a superficial portion of the positive electrode active material. The positive electrode active material includes a first region and a second region. The first region exists in an inner portion of the positive electrode active material. The second region exists in a superficial portion of the positive electrode active material and part of the inner portion thereof. The first region includes lithium, a transition metal, and oxygen. The second region includes magnesium, fluorine, and oxygen.

公开(公告)号：US20230361267A1

公开(公告)日：2023-11-09

申请号：US18221776

申请日：2023-07-13

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Yohei Momma ,  Mayumi MIKAMI ,  Aya UCHIDA ,  Kazuhito MACHIKAWA

IPC: H01M4/04 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M4/583 ,  H01M10/0525

CPC classification number: H01M4/0471 ,  H01M4/0419 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M4/5835 ,  H01M10/0525 ,  H01M2004/027

Abstract: To provide a positive electrode active material with which the cycle performance of a secondary battery can be improved and a manufacturing method thereof. When a secondary battery is fabricated using, for a positive electrode, a positive electrode active material obtained by depositing a solid electrolyte on a lithium compound with the use of a graphene compound by spray-drying treatment and volatilizing carbon from the graphene compound by heat treatment, the decomposition of an electrolyte solution in contact with the positive electrode active material can be inhibited, contributing to improvement in the cycle performance of the secondary battery.

公开(公告)号：US11670770B2

公开(公告)日：2023-06-06

申请号：US17036740

申请日：2020-09-29

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/525 ,  C01G51/00 ,  C01G53/00 ,  H01M10/0525 ,  H01M4/02

CPC classification number: H01M4/525 ,  C01G51/66 ,  C01G53/66 ,  H01M10/0525 ,  C01P2002/32 ,  C01P2002/52 ,  C01P2002/72 ,  C01P2002/77 ,  C01P2002/85 ,  C01P2002/88 ,  C01P2004/04 ,  C01P2006/40 ,  C01P2006/42 ,  H01M2004/028

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：US11664488B2

公开(公告)日：2023-05-30

申请号：US17687800

申请日：2022-03-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki Ochiai ,  Takahiro Kawakami ,  Mayumi Mikami ,  Yohei Momma ,  Masahiro Takahashi ,  Ayae Tsuruta

IPC: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/13915 ,  H01M4/134 ,  H01M4/36 ,  H01M4/525 ,  H01M4/86 ,  H01M4/02 ,  H01M10/0525

CPC classification number: H01M4/131 ,  H01M4/134 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/13915 ,  H01M4/366 ,  H01M4/525 ,  H01M4/625 ,  H01M4/8657 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/028

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.