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公开(公告)号：US20250046864A1
公开(公告)日：2025-02-06
申请号：US18921138
申请日：2024-10-21
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Shunpei YAMAZAKI , Kazutaka KURIKI , Ryota TAJIMA , Yumiko YONEDA
IPC: H01M10/0562 , H01M4/02 , H01M4/04 , H01M4/38 , H01M10/058
Abstract: An all-solid-state secondary battery having a higher level of safety than a conventional lithium-ion secondary battery using an electrolyte solution, specifically, a thin-film-type solid-state secondary battery, and a manufacturing method thereof are provided. As a solid electrolyte, a mixed material obtained by co-evaporation of SiO and an organic complex of lithium is used. That is, a solid electrolyte layer formed using a mixed material of an inorganic material and an organic material is used in a solid-state secondary battery. The ratio of oxygen to silicon in the solid electrolyte layer is higher than 1 and lower than 2.
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公开(公告)号：US20230378459A1
公开(公告)日：2023-11-23
申请号：US18248103
申请日：2021-10-13
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Kazutaka KURIKI , Yumiko YONEDA , Shiori SAGA , Yoshiharu ASADA , Shunpei YAMAZAKI
IPC: H01M4/525 , H01M10/44 , H01M4/583 , H01M10/0569 , H01M4/133 , C07D233/58
CPC classification number: H01M4/525 , H01M10/44 , H01M4/583 , H01M10/0569 , H01M4/133 , C07D233/58 , H01M2004/028
Abstract: A lithium-ion secondary battery having high capacity and excellent charge and discharge cycle performance is provided. A secondary battery having high capacity is provided. A secondary battery with excellent charge and discharge characteristics is provided. A secondary battery in which a reduction in capacity is suppressed even when a state being charged with a high voltage is held for a long time is provided. In the secondary battery, after constant current charging is performed in an environment at 60° C. with a current value of 0.5 C until a voltage reaches 4.5 V, a charging process of performing constant voltage charging until a current value reaches 0.2 C and a discharging process of performing constant current discharging with a current value of 0.5 C until a voltage reaches 3 V are alternately repeated 150 or more times, and then discharging is performed, lithium cobalt oxide that is a surface portion of the positive electrode active material particle has an O3 structure, and an electrolyte includes an imidazolium cation.
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公开(公告)号：US20230317925A1
公开(公告)日：2023-10-05
申请号：US18017189
申请日：2021-07-30
Applicant: Semiconductor Energy Laboratory Co., Ltd.
Inventor： Kazutaka KURIKI , Taisuke NAKAO , Yoshiharu ASADA , Yumiko YONEDA
CPC classification number: H01M4/366 , H01M4/0471 , H01M4/386 , H01M4/583 , H01M4/625 , H01M10/0525 , H01M2004/027
Abstract: A negative electrode with little deterioration is provided. A novel negative electrode is provided. A power storage device with little deterioration is provided. A novel power storage device is provided. The electrode contains silicon, graphite, and a graphene compound. A silicon particle with a particle diameter of less than or equal to 1 µm is attached to a graphite particle with a particle diameter 10 times or more that of the silicon particle. The graphene compound is in contact with the graphite particle so as to cover the silicon particle.
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公开(公告)号：US20230044210A1
公开(公告)日：2023-02-09
申请号：US17788483
申请日：2020-12-16
Applicant: Semiconductor Energy Laboratory Co., Ltd.
Inventor： Shunpei YAMAZAKI , Mayumi MIKAMI , Kazutaka KURIKI , Yumiko YONEDA , Teruaki OCHIAI , Yuji IWAKI
Abstract: A secondary battery with favorable cycle performance is provided. Alternatively, a secondary battery with higher capacity is provided. A positive electrode active material layer including a first graphene layer, a second graphene layer, and a positive electrode active material. The first graphene layer includes a first region covering the positive electrode active material. The second graphene layer includes a second region covering the positive electrode active material and a third region overlapping with the first region. The first region includes a plane positioned between the positive electrode active material and the third region and formed of arranged six-membered carbon rings. The positive electrode active material includes a fourth region with a layered rock-salt structure. A lithium layer with a layered rock-salt structure included in the fourth region is substantially perpendicular to the plane formed of six-membered carbon rings and included in the second region.
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公开(公告)号：US20230009782A1
公开(公告)日：2023-01-12
申请号：US17782707
申请日：2020-11-27
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Kazutaka KURIKI , Teruaki OCHIAI , Yumiko YONEDA , Shunpei YAMAZAKI
IPC: H01M4/66 , H01M10/0525 , H01M4/62
Abstract: To provide a secondary battery in which a side reaction does not easily occur at an interface between a positive electrode active material and a solid electrolyte, an interface between the positive electrode active material and a positive electrode current collector, or the like even when charge and discharge are repeated. In one embodiment of the present invention, a buffer layer or a protective layer is provided on a current collector surface or between a current collector layer and an active material layer to prevent deterioration such as oxidation of the current collector. As the buffer layer or the protective layer, it is possible to use a titanium compound such as titanium oxide, titanium oxide in which nitrogen is substituted for part of oxygen, titanium nitride, titanium nitride in which oxygen is substituted for part of nitrogen, or titanium oxynitride (TiOxNy, where 0
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Patent Agency Ranking
公开(公告)号：US20220231341A1
公开(公告)日：2022-07-21
申请号：US17616582
申请日：2020-05-26
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Kazutaka KURIKI , Yumiko YONEDA , Yohei MOMMA , Teruaki OCHIAI
IPC: H01M10/0568 , H01M50/124 , H01M50/119 , H01M50/121 , H01M4/525 , H01M10/0525 , H01M4/587 , H01M10/48
Abstract: A lithium-ion secondary battery having high capacity and excellent charge and discharge cycle performance is provided. A secondary battery having high capacity is provided. A secondary battery having excellent charge and discharge performance is provided. A secondary battery in which a decrease in capacity is suppressed even at high temperatures is provided. The secondary battery includes a positive electrode, a negative electrode, an electrolyte solution, and an exterior body. The positive electrode includes a positive electrode active material. The positive electrode active material contains lithium, cobalt, oxygen, magnesium, and fluorine. The number of magnesium atoms contained in the positive electrode active material is greater than or equal to 0.001 times and less than or equal to 0.1 times the number of cobalt atoms contained in the positive electrode active material. The positive electrode active material includes a region having a layered rock-salt crystal structure. The electrolyte solution contains an ionic liquid. The exterior body includes a metal layer and a polymer layer stacked over the metal layer. The polymer layer includes a region in contact with the electrolyte solution.
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公开(公告)号：US20220231285A1
公开(公告)日：2022-07-21
申请号：US17617188
申请日：2020-06-01
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Kazutaka KURIKI , Ryota TAJIMA , Yumiko YONEDA
Abstract: A solid-state secondary battery with high charge and discharge characteristics is provided. The solid-state secondary battery includes a first layer and a positive electrode active material layer over a substrate. The first layer and the positive electrode active material layer are in contact with each other; the first layer has conductivity; the first layer has a first crystal structure including first cations and first anions; the positive electrode active material layer has a second structure including second cations and second anions; and a value calculated by the following formula (1) is less than or equal to 0.1 when La denotes the minimum value of a distance between one of the first cations and another one of the first cations in the first crystal structure and Lb denotes the minimum value of a distance between one of the second cations and another one of the second cations. La - Lb L a ( 1 )
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公开(公告)号：US20210143404A1
公开(公告)日：2021-05-13
申请号：US17086959
申请日：2020-11-02
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Mayumi MIKAMI , Kazuhei NARITA , Teruaki OCHIAI , Yumiko YONEDA
IPC: H01M4/1397 , H01M4/04 , H01M4/62 , H01M4/58 , H01M10/0525 , H01M4/136
Abstract: A method for manufacturing a lithium-ion secondary battery more safely at a lower cost is provided. A method for manufacturing a positive electrode for a secondary battery includes a step of forming slurry by mixing graphene oxide, a binder, and a positive electrode active material in a solvent containing water; a step of applying the slurry on a positive electrode current collector; and a step of reducing graphene oxide by at least one of chemical reduction and thermal reduction. As a reducing agent for the chemical reduction, ascorbic acid can be used.
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公开(公告)号：US20210083281A1
公开(公告)日：2021-03-18
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: H01M4/525 , H01M4/131 , H01M4/134 , H01M4/133 , H01M4/505 , H01M4/36 , H01M4/139 , H01M10/0525 , C01G53/00
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.
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公开(公告)号：US20180013151A1
公开(公告)日：2018-01-11
申请号：US15638444
申请日：2017-06-30
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Yumiko YONEDA , Takuya MIWA
IPC: H01M6/10 , H01M10/04 , H01M2/26 , H01M10/0525 , H01M4/58
CPC classification number: H01M6/10 , H01M2/263 , H01M4/1397 , H01M4/364 , H01M4/5825 , H01M10/0431 , H01M10/052 , H01M10/0525 , H01M2004/028 , H01M2010/4278 , H01M2220/10 , H01M2220/20 , H01M2220/30 , Y02E60/122
Abstract: A positive electrode active material includes a plurality of groups of particles. The plurality of groups of particles has a particle diameter of more than or equal to 300 nm and less than or equal to 3 μm. Each of the groups includes two or more particles. The two or more particles are each a lithium-containing complex phosphate including one or more of iron, nickel, manganese, and cobalt. The group of particles includes a first particle and a second particle each having a major diameter and a minor diameter in the upper surface when seen from a predetermined direction. The major diameters of the first and second particles are substantially parallel to each other. The major diameter of the first particle is two to six times larger than the minor diameter of the first particle and the minor diameter of the first particle is more than or equal to 20 nm and less than or equal to 130 nm.
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