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公开(公告)号：US11637293B2
公开(公告)日：2023-04-25
申请号：US16892582
申请日：2020-06-04
发明人： Yumiko Yoneda , Takuya Miwa
IPC分类号： H01M6/10 , H01M4/1397 , H01M4/36 , H01M50/538 , H01M4/58 , H01M10/04 , H01M10/052 , H01M4/02 , H01M10/42 , H01M10/0525
摘要： 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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公开(公告)号：US11101492B2
公开(公告)日：2021-08-24
申请号：US16787105
申请日：2020-02-11
发明人： Minoru Takahashi , Ryota Tajima , Takuya Miwa , Yuugo Goto
IPC分类号： H01M10/04 , H01M50/463 , H01M10/42 , H01M50/10
摘要： In the case where a film, which has lower strength than a metal can, is used as an exterior body of a secondary battery, a current collector provided in a region surrounded by the exterior body, an active material layer provided on a surface of the current collector, or the like might be damaged when force is externally applied to the secondary battery. A secondary battery that is durable even when force is externally applied thereto is provided. A cushioning material is provided in a region surrounded by an exterior body of a secondary battery. Specifically, a cushioning material is provided on the periphery of a current collector such that a sealing portion of an exterior body (film) is located outside the cushioning material.
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公开(公告)号：US10784516B2
公开(公告)日：2020-09-22
申请号：US15189517
申请日：2016-06-22
发明人： Teruaki Ochiai , Takahiro Kawakami , Takuya Miwa
IPC分类号： H01M4/00 , H01M4/66 , H01M4/131 , H01M4/587 , H01M4/36 , H01M4/62 , H01G11/50 , H01G11/36 , H01G11/86 , H01G11/38 , H01M10/0525
摘要： A novel electrode is provided. A novel power storage device is provided. A conductor having a sheet-like shape is provided. The conductor has a thickness of greater than or equal to 800 nm and less than or equal to 20 μm. The area of the conductor is greater than or equal to 25 mm2 and less than or equal to 10 m2. The conductor includes carbon and oxygen. The conductor includes carbon at a concentration of higher than 80 atomic % and oxygen at a concentration of higher than or equal to 2 atomic % and lower than or equal to 20 atomic %.
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公开(公告)号：US10680242B2
公开(公告)日：2020-06-09
申请号：US15586341
申请日：2017-05-04
发明人： Takuya Miwa , Yumiko Yoneda , Teppei Oguni
IPC分类号： H01M4/58 , C01B25/45 , H01M10/0525 , H01M4/02
摘要： A composite oxide with high diffusion rate of lithium is provided. Alternatively, a lithium-containing complex phosphate with high diffusion rate of lithium is provided. Alternatively, a positive electrode active material with high diffusion rate of lithium is provided. Alternatively, a lithium ion battery with high output is provided. Alternatively, a lithium ion battery that can be manufactured at low cost is provided. A positive electrode active material is formed through a first step of mixing a lithium compound, a phosphorus compound, and water, a second step of adjusting pH by adding a first aqueous solution to a first mixed solution formed in the first step, a third step of mixing an iron compound with a second mixed solution formed in the second step, a fourth step of performing heat treatment under a pressure more than or equal to 0.1 MPa and less than or equal to 2 MPa at a highest temperature more than 100° C. and less than or equal to 119° C. on a third mixed solution formed in the third step with a pH of more than or equal to 3.5 and less than or equal to 5.0.
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公开(公告)号：US12080893B2
公开(公告)日：2024-09-03
申请号：US18202523
申请日：2023-05-26
发明人： Teruaki Ochiai , Takahiro Kawakami , Takuya Miwa
IPC分类号： H01M4/00 , H01G11/36 , H01G11/38 , H01G11/50 , H01G11/86 , H01M4/131 , H01M4/36 , H01M4/587 , H01M4/62 , H01M4/66 , H01M10/0525
CPC分类号： H01M4/663 , H01G11/36 , H01G11/38 , H01G11/50 , H01G11/86 , H01M4/131 , H01M4/366 , H01M4/587 , H01M4/625 , H01M10/0525
摘要： A novel electrode is provided. A novel power storage device is provided. A conductor having a sheet-like shape is provided. The conductor has a thickness of greater than or equal to 800 nm and less than or equal to 20 μm. The area of the conductor is greater than or equal to 25 mm2 and less than or equal to 10 m2. The conductor includes carbon and oxygen. The conductor includes carbon at a concentration of higher than 80 atomic % and oxygen at a concentration of higher than or equal to 2 atomic % and lower than or equal to 20 atomic %.
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公开(公告)号：US10944110B2
公开(公告)日：2021-03-09
申请号：US16454116
申请日：2019-06-27
发明人： Yumiko Yoneda , Teppei Oguni , Takuya Miwa , Masaki Yamakaji , Ayae Tsuruta
IPC分类号： 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
摘要： 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.
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公开(公告)号：US10601066B2
公开(公告)日：2020-03-24
申请号：US14709950
申请日：2015-05-12
发明人： Minoru Takahashi , Ryota Tajima , Takuya Miwa , Yuugo Goto
摘要： In the case where a film, which has lower strength than a metal can, is used as an exterior body of a secondary battery, a current collector provided in a region surrounded by the exterior body, an active material layer provided on a surface of the current collector, or the like might be damaged when force is externally applied to the secondary battery. A secondary battery that is durable even when force is externally applied thereto is provided. A cushioning material is provided in a region surrounded by an exterior body of a secondary battery. Specifically, a cushioning material is provided on the periphery of a current collector such that a sealing portion of an exterior body (film) is located outside the cushioning material.
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公开(公告)号：US10586954B2
公开(公告)日：2020-03-10
申请号：US14717615
申请日：2015-05-20
发明人： Minoru Takahashi , Yuugo Goto , Yumiko Yoneda , Takuya Miwa , Ryota Tajima
摘要： In the case where a film, which has lower strength than a metal can, is used as an exterior body of a secondary battery, a current collector provided in a region surrounded by the exterior body, an active material layer provided on a surface of the current collector, or the like might be damaged when force is externally applied to the secondary battery. A secondary battery which is resistant to external force is obtained. An opening is provided in a central portion of the secondary battery, and a terminal is formed in the opening. An outer edge of the secondary battery is fixed by thermocompression bonding. In addition, the central portion of the secondary battery is fixed by thermocompression bonding, so that the amount of bending is limited even when the outer edge portion of the secondary battery is bent.
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公开(公告)号：US10381646B2
公开(公告)日：2019-08-13
申请号：US15381152
申请日：2016-12-16
发明人： Yumiko Yoneda , Teppei Oguni , Takuya Miwa , Masaki Yamakaji , Ayae Tsuruta
IPC分类号： H01M10/0525 , H01M4/36 , H01M2/14 , H01M4/587 , H01M2/16 , H01M4/04 , H01M4/1393 , H01M10/0587 , H01M4/62 , C01B32/225 , C01B32/23 , H01M4/133 , H01M4/02 , H01M10/052
摘要： 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.
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公开(公告)号：US09640831B2
公开(公告)日：2017-05-02
申请号：US14710005
申请日：2015-05-12
发明人： Ryota Tajima , Minoru Takahashi , Junya Goto , Takuya Miwa
IPC分类号： H01M10/04 , H01M2/18 , H01M10/058 , H01M4/13 , H01M10/052 , H01M2/26
CPC分类号： H01M2/0275 , H01M2/021 , H01M2/0277 , H01M2/18 , H01M2/26 , H01M4/13 , H01M10/0436 , H01M10/052 , H01M10/0525 , H01M10/058 , H01M10/0585 , H01M2220/30
摘要： In the case where a film, which has lower strength than a metal can, is used as an exterior body of a secondary battery, a current collector provided in a region surrounded by the exterior body, an active material layer provided on a surface of the current collector, or the like might be damaged when force is externally applied to the secondary battery. A secondary battery that is durable even when force is externally applied thereto is provided. A region that is easily partly bent and a region that is not easily partly bent owing to a protective material provided in the region are intentionally formed to obtain the durable secondary battery.
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