公开(公告)号：US10403879B2

公开(公告)日：2019-09-03

申请号：US14976504

申请日：2015-12-21

Applicant: Semiconductor Energy Laboratory Co., LTD.

Inventor： Junpei Momo ,  Yohei Momma ,  Masaki Yamakaji ,  Teppei Oguni

IPC: H01M4/04 ,  H01M10/052 ,  H01M10/04 ,  H01M10/058 ,  C25D11/00 ,  C25D21/02 ,  C25D21/10

Abstract: To provide a method of manufacturing a lithium-ion secondary battery having stable charge characteristics and lifetime characteristics. A positive electrode is subjected to an electrochemical reaction in a large amount of electrolytic solution in advance before a secondary battery is completed. In this manner, the positive electrode can have stability. The use of the positive electrode enables manufacture of a highly reliable secondary battery. Similarly, a negative electrode is subjected to an electrochemical reaction in a large amount of electrolytic solution in advance. The use of the negative electrode enables manufacture of a highly reliable secondary battery.

公开(公告)号：US09385366B2

公开(公告)日：2016-07-05

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: H01M4/02 ,  H01M4/131 ,  H01M4/04 ,  H01M4/62 ,  H01M4/1391 ,  H01M4/136 ,  H01M4/1397 ,  H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M4/587 ,  H01M10/052

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：US09373834B2

公开(公告)日：2016-06-21

申请号：US13710497

申请日：2012-12-11

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masaki Yamakaji ,  Rika Yatabe ,  Hiroatsu Todoriki

IPC: B05D5/12 ,  H01M4/04 ,  H01M4/139 ,  H01M4/1391 ,  H01M4/1397 ,  H01M4/62

CPC classification number: H01M4/0404 ,  H01M4/139 ,  H01M4/1391 ,  H01M4/1397 ,  H01M4/623 ,  H01M4/625 ,  Y02E60/122 ,  Y02P70/54

Abstract: To provide a positive electrode for a lithium-ion secondary battery, which is highly filled with a positive electrode active material and has a high-density positive electrode active material layer. To provide a lithium-ion secondary battery having high capacity and improved cycle characteristics with use of the positive electrode. After graphene oxide is dispersed in a dispersion medium, a positive electrode active material is added and mixed to form a mixture. A binder is added to the mixture and mixed to form a positive electrode paste. The positive electrode paste is applied to a positive electrode current collector and the dispersion medium contained in the positive electrode paste is evaporated, and then, the graphene oxide is reduced, so that a positive electrode active material layer containing graphene is formed over the positive electrode current collector.

Abstract translation: 为了提供高纯度的正极活性物质并具有高密度正极活性物质层的锂离子二次电池用正极。 使用正极来提供具有高容量和改进的循环特性的锂离子二次电池。 将氧化石墨烯分散在分散介质中后，加入正极活性物质并混合形成混合物。 向混合物中加入粘合剂并混合以形成正极浆料。 将正极浆料涂布在正极集电体上，将正极浆料中所含的分散介质蒸发，然后将石墨烯氧化物还原，从而在正极上形成含有石墨烯的正极活性物质层 集电器

公开(公告)号：US12176485B2

公开(公告)日：2024-12-24

申请号：US18395852

申请日：2023-12-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yumiko Yoneda ,  Masaki Yamakaji ,  Ryota Tajima ,  Masaaki Hiroki

IPC: H01M10/0565 ,  H01M4/02 ,  H01M4/13 ,  H01M10/04 ,  H01M10/052 ,  H01M10/0585 ,  H01M50/119 ,  H01M50/121 ,  H01M50/122 ,  H01M50/124

Abstract: A gel electrolyte and a separator are provided between the positive electrode current collector and the negative electrode current collector. The plurality of positive electrode current collectors and the plurality of negative electrode current collectors are stacked such that surfaces of negative electrodes with which active material layers are not coated or surfaces of positive electrodes with which active material layers are not coated are in contact with each other.

公开(公告)号：US12027702B2

公开(公告)日：2024-07-02

申请号：US17160735

申请日：2021-01-28

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro Kawakami ,  Masaki Yamakaji

IPC: H01M4/58 ,  B60L50/64 ,  B82Y30/00 ,  H01M4/02 ,  H01M4/136 ,  H01M4/1397 ,  H01M10/04 ,  H01M10/0525

CPC classification number: H01M4/5825 ,  B60L50/64 ,  B82Y30/00 ,  H01M4/136 ,  H01M4/1397 ,  H01M10/0436 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/028 ,  H01M2220/20 ,  Y02E60/10 ,  Y02P70/50 ,  Y02T10/70

Abstract: An object is to improve the characteristics of a power storage device such as a charging and discharging rate or a charge and discharge capacity. The grain size of particles of a positive electrode active material is nano-sized so that a surface area per unit mass of the active material is increased. Specifically, the grain size is set to greater than or equal to 10 nm and less than or equal to 100 nm, preferably greater than or equal to 20 nm and less than or equal to 60 nm. Alternatively, the surface area per unit mass is set to 10 m2/g or more, preferably 20 m2/g or more, further, the crystallinity of the active material is increased by setting an XRD half width to greater than or equal to 0.12° and less than 0.17°, preferably greater than or equal to 0.13° and less than 0.16°.

公开(公告)号：US11962013B2

公开(公告)日：2024-04-16

申请号：US17178286

申请日：2021-02-18

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masaki Yamakaji ,  Kuniharu Nomoto

IPC: H01M4/62 ,  H01M4/04 ,  H01M4/134 ,  H01M4/136 ,  H01M4/1397 ,  H01M4/58

CPC classification number: H01M4/625 ,  H01M4/134 ,  H01M4/136 ,  H01M4/1397 ,  H01M4/622 ,  H01M4/0404 ,  H01M4/5825

Abstract: The positive electrode active material layer includes a plurality of particles of a positive electrode active material and a reaction mixture where reduced graphene oxide is bonded to a polymer having a functional group as a side chain. The reduced graphene oxide has a sheet-like shape and high conductivity and thus functions as a conductive additive by being in contact with the plurality of particles of the positive electrode active material. The reaction mixture serves as an excellent binder since the reduced graphene oxide is bonded to the polymer. Therefore, even a small amount of the reaction mixture where the reduced graphene oxide is covalently bonded to the polymer excellently serves as a conductive additive and a binder.

公开(公告)号：US11121405B2

公开(公告)日：2021-09-14

申请号：US15818814

申请日：2017-11-21

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Yumiko Yoneda ,  Masaki Yamakaji ,  Ryota Tajima ,  Masaaki Hiroki

IPC: H01M10/0565 ,  H01M4/13 ,  H01M4/02 ,  H01M10/04 ,  H01M10/052 ,  H01M10/0585 ,  H01M50/116

Abstract: A gel electrolyte and a separator are provided between the positive electrode current collector and the negative electrode current collector. The plurality of positive electrode current collectors and the plurality of negative electrode current collectors are stacked such that surfaces of negative electrodes with which active material layers are not coated or surfaces of positive electrodes with which active material layers are not coated are in contact with each other.

公开(公告)号：US20210202945A1

公开(公告)日：2021-07-01

申请号：US17184074

申请日：2021-02-24

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yumiko Yoneda ,  Teppei Oguni ,  Takuya Miwa ,  Masaki Yamakaji ,  Ayae Tsuruta

IPC: H01M4/587 ,  H01M4/62 ,  C01B32/225 ,  C01B32/23 ,  H01M50/44 ,  H01M50/46 ,  H01M50/403 ,  H01M50/411 ,  H01M50/429 ,  H01M4/04 ,  H01M4/1393 ,  H01M4/36 ,  H01M10/0525 ,  H01M10/0587

Abstract: To provide a manufacturing method of graphene oxide that allows mass production through a relatively simple process, at low costs, and with safety and efficiency. A hydrogen peroxide solution, sulfuric acid, and flake graphite are put in a reaction container, and the mixture is stirred to obtain expansion graphite. The synthesized expansion graphite is washed not with pure water but with a saturated aqueous solution of magnesium sulfate (MgSO4) or an organic solvent, whereby a large amount of sulfuric acid is contained between graphite layers. The expansion graphite is subjected to heat treatment or microwave irradiation to form expanded graphite, and a graphite layer is peeled by ultrasonic treatment and then oxidized to form a graphene compound.

公开(公告)号：US10272594B2

公开(公告)日：2019-04-30

申请号：US14642079

申请日：2015-03-09

Applicant: Semiconductor Energy Laboratory Co., LTD.

Inventor： Masaki Yamakaji ,  Koji Nara ,  Mako Motoyoshi

IPC: B29B9/12 ,  H01M4/04 ,  C01B33/20 ,  C01B33/32 ,  H01M4/36 ,  H01M4/58 ,  B29B9/16 ,  H01M4/136 ,  H01M10/052 ,  B29K105/00 ,  B29L31/00

Abstract: In a manufacturing process of a positive electrode active material for a power storage device, which includes a lithium silicate compound represented by a general formula Li2MSiO4, heat treatment is performed at a high temperature on a mixture material, grinding treatment is performed, a carbon-based material is added, and then heat treatment is performed again. Therefore, the reactivity between the substances contained in the mixture material is enhanced, favorable crystallinity can be obtained, and further microparticulation of the grain size of crystal which is grown larger by the high temperature treatment and crystallinity recovery are achieved; and at the same time, carbon can be supported on the surfaces of particles of the crystallized mixture material. Accordingly, a positive electrode active material for a power storage device, in which electron conductivity is improved, can be manufactured.

公开(公告)号：US10944110B2

公开(公告)日：2021-03-09

申请号：US16454116

申请日：2019-06-27

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yumiko Yoneda ,  Teppei Oguni ,  Takuya Miwa ,  Masaki Yamakaji ,  Ayae Tsuruta

IPC: H01M4/587 ,  C01B32/23 ,  C01B32/225 ,  H01M10/0587 ,  H01M10/0525 ,  H01M4/1393 ,  H01M2/16 ,  H01M4/62 ,  H01M4/04 ,  H01M4/36 ,  H01M2/14 ,  H01M10/052 ,  H01M4/133 ,  H01M4/02

Abstract: To provide a manufacturing method of graphene oxide that allows mass production through a relatively simple process, at low costs, and with safety and efficiency. A hydrogen peroxide solution, sulfuric acid, and flake graphite are put in a reaction container, and the mixture is stirred to obtain expansion graphite. The synthesized expansion graphite is washed not with pure water but with a saturated aqueous solution of magnesium sulfate (MgSO4) or an organic solvent, whereby a large amount of sulfuric acid is contained between graphite layers. The expansion graphite is subjected to heat treatment or microwave irradiation to form expanded graphite, and a graphite layer is peeled by ultrasonic treatment and then oxidized to form a graphene compound.