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1.发明授权公开(公告)号：US11881578B2
公开(公告)日：2024-01-23
申请号：US18085682
申请日：2022-12-21
CPC分类号： H01M4/0404 , H01M4/0471 , H01M4/13 , H01M4/139 , H01M4/625 , H01M2220/30
摘要： In manufacturing a storage battery electrode, a method for manufacturing a storage battery electrode with high capacity and stability is provided. As a method for preventing a mixture for forming an active material layer from becoming strongly basic, a first aqueous solution is formed by mixing an active material exhibiting basicity with an aqueous solution exhibiting acidity and including an oxidized derivative of a first conductive additive; a first mixture is formed by reducing the oxidized derivative of the first conductive additive by drying the first aqueous solution; a second mixture is formed by mixing a second conductive additive and a binder; a third mixture is formed by mixing the first mixture and the second mixture; and a current collector is coated with the third mixture. The strong basicity of the mixture for forming an active material layer is lowered; thus, the binder can be prevented from becoming gelled.
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公开(公告)号：US20220190313A1
公开(公告)日：2022-06-16
申请号：US17687800
申请日：2022-03-07
发明人： Teruaki Ochiai , Takahiro Kawakami , Mayumi Mikami , Yohei Momma , Masahiro Takahashi , Ayae Tsuruta
IPC分类号： H01M4/131 , H01M4/134 , H01M4/36 , H01M4/13915 , H01M4/525 , H01M4/1315 , H01M4/86 , H01M4/1391 , H01M4/62
摘要： 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：US11094927B2
公开(公告)日：2021-08-17
申请号：US15726520
申请日：2017-10-06
发明人： Takahiro Kawakami , Teruaki Ochiai , Yohei Momma , Ayae Tsuruta , Masahiro Takahashi , Mayumi Mikami
IPC分类号： H01M4/36 , H01M4/04 , H01M4/62 , H01G11/24 , H01G11/86 , H01G11/50 , H01G11/60 , H01M4/505 , H01M4/525 , H01M10/0525 , H01M4/02
摘要： 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：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：US10741828B2
公开(公告)日：2020-08-11
申请号：US15638449
申请日：2017-06-30
发明人： Teruaki Ochiai , Takahiro Kawakami , Mayumi Mikami , Yohei Momma , Masahiro Takahashi , Ayae Tsuruta
IPC分类号： H01M4/131 , H01M4/1315 , H01M4/1391 , H01M4/62 , H01M4/13915 , H01M4/86 , H01M4/02 , H01M10/0525
摘要： 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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6.发明授权公开(公告)号：US10084186B2
公开(公告)日：2018-09-25
申请号：US14920650
申请日：2015-10-22
发明人： Takahiro Kawakami , Teruaki Ochiai , Shuhei Yoshitomi , Takuya Hirohashi , Mako Motoyoshi , Yohei Momma , Junya Goto
IPC分类号： H01M4/505 , H01M4/36 , H01M4/131 , H01M4/1391
CPC分类号： H01M4/505 , H01M4/131 , H01M4/1391 , H01M4/366 , H01M2220/30
摘要： 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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公开(公告)号：US11777089B2
公开(公告)日：2023-10-03
申请号：US17729170
申请日：2022-04-26
发明人： Mayumi Mikami , Aya Uchida , Yumiko Yoneda , Yohei Momma , Masahiro Takahashi , Teruaki Ochiai
IPC分类号： H01B1/08 , H01M4/505 , C01G53/00 , H01M4/525 , H01M4/131 , H01M4/133 , H01M4/134 , H01M4/139 , H01M4/36 , H01M10/0525 , H01M6/16 , H01M4/02
CPC分类号： H01M4/525 , C01G53/50 , H01B1/08 , H01M4/131 , H01M4/133 , H01M4/134 , H01M4/139 , H01M4/366 , H01M4/505 , H01M6/164 , H01M10/0525 , C01P2002/74 , H01M2004/028
摘要： 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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8.发明授权公开(公告)号：US11545655B2
公开(公告)日：2023-01-03
申请号：US17171042
申请日：2021-02-09
摘要： In manufacturing a storage battery electrode, a method for manufacturing a storage battery electrode with high capacity and stability is provided.
As a method for preventing a mixture for forming an active material layer from becoming strongly basic, a first aqueous solution is formed by mixing an active material exhibiting basicity with an aqueous solution exhibiting acidity and including an oxidized derivative of a first conductive additive; a first mixture is formed by reducing the oxidized derivative of the first conductive additive by drying the first aqueous solution; a second mixture is formed by mixing a second conductive additive and a binder; a third mixture is formed by mixing the first mixture and the second mixture; and a current collector is coated with the third mixture. The strong basicity of the mixture for forming an active material layer is lowered; thus, the binder can be prevented from becoming gelled.-
9.发明授权公开(公告)号：US10923706B2
公开(公告)日：2021-02-16
申请号：US16521650
申请日：2019-07-25
摘要： In manufacturing a storage battery electrode, a method for manufacturing a storage battery electrode with high capacity and stability is provided.
As a method for preventing a mixture for forming an active material layer from becoming strongly basic, a first aqueous solution is formed by mixing an active material exhibiting basicity with an aqueous solution exhibiting acidity and including an oxidized derivative of a first conductive additive; a first mixture is formed by reducing the oxidized derivative of the first conductive additive by drying the first aqueous solution; a second mixture is formed by mixing a second conductive additive and a binder; a third mixture is formed by mixing the first mixture and the second mixture; and a current collector is coated with the third mixture. The strong basicity of the mixture for forming an active material layer is lowered; thus, the binder can be prevented from becoming gelled.-
公开(公告)号：US10230093B2
公开(公告)日：2019-03-12
申请号：US15273131
申请日：2016-09-22
发明人： Yohei Momma , Takahiro Kawakami , Teruaki Ochiai
IPC分类号： H01M4/04 , H01M4/62 , H01M4/505 , H01M10/052
摘要： A storage battery electrode with high capacity is stably manufactured with the use of a strongly basic active material. The basicity of a mixture of a strongly basic active material and graphene oxide, the mixture subjected to heat treatment, or the mixture subjected to reduction by addition of a reducing agent is measured. Only in the case where the measured basicity falls within a predetermined range, a binder such as polyvinylidene fluoride (PVdF) is mixed to form a slurry. Thus, gelation of the binder can be prevented.
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