公开(公告)号：US20140057165A1

公开(公告)日：2014-02-27

申请号：US13973524

申请日：2013-08-22

Applicant: Semiconductor Energy Laboratory Co., Ltd.

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

IPC: H01M4/131 ,  H01M4/62 ,  H01M4/1391 ,  H01M4/04

CPC classification number: H01M4/366 ,  H01M4/0404 ,  H01M4/043 ,  H01M4/0471 ,  H01M4/131 ,  H01M4/136 ,  H01M4/1391 ,  H01M4/1397 ,  H01M4/505 ,  H01M4/525 ,  H01M4/5825 ,  H01M4/587 ,  H01M4/625 ,  H01M10/052 ,  H01M10/0525 ,  H01M2004/028 ,  Y02E60/122 ,  Y02P70/54 ,  Y02T10/7011

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 %.

Abstract translation: 提供一种能够实现良好的电池特性和预定电极电极强度的二次电池用正极，二次电池以及二次电池用正极的制造方法。 二次电池用正极在集电体上具有集电体和活性物质层。 活性物质层包括活性物质，石墨烯和粘合剂。 碳层在活性材料的表面上。 活性物质层中的石墨烯的比例大于或等于0.1重量％且小于或等于1.0重量％。

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：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：US09768443B2

公开(公告)日：2017-09-19

申请号：US14070636

申请日：2013-11-04

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

CPC classification number: H01M4/1393 ,  H01M4/131 ,  H01M4/133 ,  H01M4/1391 ,  H01M4/364 ,  H01M4/625 ,  Y02E60/122

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：US20140127568A1

公开(公告)日：2014-05-08

申请号：US14070636

申请日：2013-11-04

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/587 ,  H01M4/1393

CPC classification number: H01M4/1393 ,  H01M4/131 ,  H01M4/133 ,  H01M4/1391 ,  H01M4/364 ,  H01M4/625 ,  Y02E60/122

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.

Abstract translation: 提供一种非水系二次电池用正极，其包含具有导电性添加剂的低比例的足够的电子传导性的活性物质层。 一种非水系二次电池用正极，包括高活性物质层，包含活性物质和导电性添加剂的比率低的活性物质层。 活性物质层包括具有层状岩盐结构的活性物质的多个粒子，与活性物质的多个粒子表面接触的石墨烯和粘合剂。