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公开(公告)号：US20240266502A1
公开(公告)日：2024-08-08
申请号：US18442424
申请日：2024-02-15
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Masahiro TAKAHASHI , Teruaki OCHIAI , Yohei MOMMA , Ayae TSURUTA
CPC classification number: H01M4/364 , H01M4/505 , H01M4/525 , H01M2004/028
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.
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公开(公告)号：US20240047655A1
公开(公告)日：2024-02-08
申请号：US18257335
申请日：2021-12-03
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Kazutaka KURIKI , Taisuke NAKAO , Teruaki OCHIAI , Tatsuyoshi TAKAHASHI , Shunpei YAMAZAKI
IPC: H01M4/36 , H01M4/587 , H01M4/133 , H01M4/38 , H01M4/134 , H01M10/0568 , H01M10/0525
CPC classification number: H01M4/366 , H01M4/587 , H01M4/133 , H01M4/386 , H01M4/134 , H01M10/0568 , H01M10/0525 , H01M2004/027
Abstract: A secondary battery has a high capacity and little deterioration can be provided. Alternatively, a novel power storage device is provided. The secondary battery includes a positive electrode and a negative electrode. The negative electrode includes a first active material, a second active material, and a graphene compound. At least part of a surface of the first active material includes a region covered with the second active material. A surface of the second active material and at least part of the surface of the first active material each include a region covered with the graphene compound. The first active material includes graphite. The second active material includes silicon. The capacity of the positive electrode is greater than or equal to 50% and less than 100% of the capacity of the negative electrode.
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3.发明公开公开(公告)号：US20230361290A1
公开(公告)日：2023-11-09
申请号：US18212440
申请日：2023-06-21
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 , H01M4/366 , H01M4/131 , H01M4/1391 , 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.
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4.发明公开公开(公告)号：US20230327073A1
公开(公告)日：2023-10-12
申请号：US18203085
申请日：2023-05-30
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
CPC classification number: H01M4/131 , H01M4/1315 , H01M4/1391 , H01M4/625 , H01M4/13915 , H01M4/134 , H01M4/366 , H01M4/525 , H01M4/8657 , H01M2004/021
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.
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公开(公告)号：US20230299305A1
公开(公告)日：2023-09-21
申请号：US18202523
申请日：2023-05-26
Applicant: Semiconductor Energy Laboratory Co., Ltd.
Inventor： Teruaki OCHIAI , Takahiro KAWAKAMI , Takuya MIWA
IPC: H01M4/66 , H01M4/131 , H01M4/587 , H01M4/36 , H01M4/62 , H01G11/50 , H01G11/36 , H01G11/86 , H01G11/38
CPC classification number: H01M4/663 , H01M4/131 , H01M4/587 , H01M4/366 , H01M4/625 , H01G11/50 , H01G11/36 , H01G11/86 , H01G11/38 , H01M10/0525
Abstract: 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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Patent Agency Ranking
6.发明公开公开(公告)号：US20230299274A1
公开(公告)日：2023-09-21
申请号：US18201818
申请日：2023-05-25
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
CPC classification number: H01M4/366 , H01M4/0471 , H01M4/62 , H01G11/24 , H01G11/86 , H01G11/50 , H01G11/60 , H01M4/505 , H01M4/525 , H01M4/628 , H01M10/0525
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.
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公开(公告)号：US20230074610A1
公开(公告)日：2023-03-09
申请号：US17904395
申请日：2021-03-02
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Teruaki OCHIAI , Yumiko YONEDA , Kazutaka KURIKI , Shunpei YAMAZAKI
IPC: H01M4/62 , H01M4/04 , H01M10/0525 , H01M4/38 , B60L50/64
Abstract: An active material layer that has a high filling rate and a higher density and is formed using a small amount of conductive additive is provided. A positive electrode active material layer includes a first carbon material and a second carbon material, which is more likely to aggregate than the first carbon material, and mixing is performed such that the weight of the second carbon material is more than or equal to 1.5 times and less than or equal to 20 times that of the first carbon material, thereby preventing the aggregation of the second carbon material and the aggregation of the first carbon material and reducing the proportion of the aggregated portions.
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公开(公告)号：US20230014507A1
公开(公告)日：2023-01-19
申请号：US17782835
申请日：2020-12-01
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Yohei MOMMA , Jo SAITO , Teruaki OCHIAI , Mayumi MIKAMI
Abstract: To provide a method of forming a positive electrode active material with high productivity. To provide a manufacturing apparatus capable of forming a positive electrode active material with high productivity. Provided is a method of forming a positive electrode active material including lithium, a transition metal, oxygen, and fluorine. An adhesion preventing step is performed during heating of an object. Examples of the adhesion preventing step include stirring by rotating a furnace during the heating, stirring by vibrating a container containing an object during the heating, and crushing performed between the plurality of heating steps. By these manufacturing methods, a positive electrode active material having favorable distribution of an additive at the surface portion can be formed.
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9.发明申请公开(公告)号：US20220263089A1
公开(公告)日：2022-08-18
申请号：US17729236
申请日：2022-04-26
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Yohei MOMMA , Teruaki OCHIAI , Mayumi MIKAMI , Jyo SAITOU
IPC: H01M4/525 , C01G51/00 , C01G53/00 , H01M4/505 , H01M10/0525 , H01M10/0568 , H01M10/0569
Abstract: A positive electrode active material, which has higher capacity and excellent charge and discharge cycle performance, for a lithium-ion secondary battery is provided. The positive electrode active material includes lithium, cobalt, magnesium, oxygen, and fluorine; when a pattern obtained by powder X ray diffraction using a CuKα1 ray is subjected to Rietveld analysis, the positive electrode active material has a crystal structure having a space group R-3m, a lattice constant of an a-axis is greater than 2.814×10(−10th power) m and less than 2.817×10(−10th power) m, and a lattice constant of a c-axis is greater than 14.05×10(−10th power) m and less than 14.07×10(−10th power) m; and in analysis by X-ray photoelectron spectroscopy, a relative value of a magnesium concentration is higher than or equal to 1.6 and lower than or equal to 6.0 with the cobalt concentration regarded as 1.
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10.发明申请公开(公告)号：US20220246931A1
公开(公告)日：2022-08-04
申请号：US17727300
申请日：2022-04-22
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Yohei MOMMA , Teruaki OCHIAI , Mayumi MIKAMI , Jyo SAITOU
IPC: H01M4/525 , C01G51/00 , C01G53/00 , H01M4/505 , H01M10/0525 , H01M10/0568 , H01M10/0569
Abstract: A positive electrode active material, which has higher capacity and excellent charge and discharge cycle performance, for a lithium-ion secondary battery is provided. The positive electrode active material includes lithium, cobalt, magnesium, oxygen, and fluorine; when a pattern obtained by powder X ray diffraction using a CuKα1 ray is subjected to Rietveld analysis, the positive electrode active material has a crystal structure having a space group R-3m, a lattice constant of an a-axis is greater than 2.814×10(−10th power) m and less than 2.817×10(−10th power) m, and a lattice constant of a c-axis is greater than 14.05×10(−10th power) m and less than 14.07×10(−10th power) m; and in analysis by X-ray photoelectron spectroscopy, a relative value of a magnesium concentration is higher than or equal to 1.6 and lower than or equal to 6.0 with the cobalt concentration regarded as 1.
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