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11.发明申请公开(公告)号：US20180102536A1
公开(公告)日：2018-04-12
申请号：US15726520
申请日：2017-10-06
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Takahiro KAWAKAMI , Teruaki OCHIAI , Yohei MOMMA , Ayae TSURUTA , Masahiro TAKAHASHI , Mayumi MIKAMI
CPC classification number: H01M4/366 , H01G11/24 , H01G11/50 , H01G11/60 , H01G11/86 , H01M4/0471 , H01M4/505 , H01M4/525 , H01M4/62 , H01M4/628 , H01M10/0525 , H01M2004/028
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：US20160164089A1
公开(公告)日：2016-06-09
申请号：US15040051
申请日：2016-02-10
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Takahiro KAWAKAMI , Shuhei YOSHITOMI , Teruaki OCHIAI , Yumiko SAITO , Yohei MOMMA , Satoshi SEO , Mayumi MIKAMI , Shunsuke ADACHI
IPC: H01M4/505 , H01M4/525 , H01M10/0525
CPC classification number: H01M4/505 , H01B1/08 , H01M4/362 , H01M4/525 , H01M10/052 , H01M10/0525 , H01M2004/028 , H01M2220/20 , H01M2220/30 , Y02E60/122
Abstract: The amount of lithium ions that can be received and released in and from a positive electrode active material is increased, and high capacity and high energy density of a secondary battery are achieved. Provided is a lithium-manganese composite oxide represented by LixMnyMzOw, where M is a metal element other than Li and Mn, or Si or P, and y, z, and w satisfy 0≦x/(y+z) 0, z>0, 0.26≦(y+z)/w
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公开(公告)号：US20250105277A1
公开(公告)日：2025-03-27
申请号：US18970314
申请日：2024-12-05
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Yohei MOMMA , Mayumi MIKAMI , Teruaki OCHIAI , Kazuhei NARITA , Jyo SAITO
Abstract: A positive electrode active material for a lithium ion secondary battery which has a large capacity and a good charge-and-discharge cycle performance is provided. The positive electrode active material includes lithium, cobalt, oxygen, and magnesium, and has a compound represented by a layered rock-salt crystal structure. A space group of the compound is represented by R-3m. The compound is a composite oxide in which magnesium is substituted for a lithium position and a cobalt position. The compound is a particle. The magnesium substituted for a lithium position and a cobalt position exists more in the region from the surface to 5 nm than in the region deeper than 10 nm from the surface. More magnesium is substituted for a lithium position than for a cobalt position.
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公开(公告)号：US20240379941A1
公开(公告)日：2024-11-14
申请号：US18576873
申请日：2022-06-27
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Jo SAITO , Tatsuyoshi TAKAHASHI , Kunihiko SUZUKI , Shunsuke HOSOUMI , Mayumi MIKAMI , Kazuki TANEMURA , Yuji IWAKI , Shunpei YAMAZAKI
IPC: H01M4/36 , C01G51/00 , H01M4/02 , H01M4/1315 , H01M4/525 , H01M10/0525
Abstract: A positive electrode active material that is unlikely to generate defects even when charging and discharging at a high voltage and/or at a high temperature is provided. A positive electrode active material in which crystal structures are unlikely to collapse even when charging and discharging are repeated is also provided. The positive electrode active material contains lithium, cobalt, oxygen, and an additive element. The positive electrode active material includes a surface portion, an inner portion. The positive electrode active material contains the additive element in the surface portion. The surface portion is a region extending from a surface of the positive electrode active material to a depth of 10 nm or less toward the inner portion, and the surface portion and the inner portion are topotaxy. A degree of diffusion of the additive element vary between crystal planes of the surface portion, and the additive element is at least one or two or more selected from nickel, aluminum, and magnesium.
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15.发明公开公开(公告)号：US20230343952A1
公开(公告)日：2023-10-26
申请号：US18002197
申请日：2021-06-15
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Yohei MOMMA , Mayumi MIKAMI , Teruaki OCHIAI
IPC: H01M4/525 , H01M4/1315 , H01M10/04 , H01M4/04 , C01G51/00
CPC classification number: H01M4/525 , H01M4/1315 , H01M10/049 , H01M4/0471 , C01G51/42 , H01M2004/028
Abstract: A positive electrode active material with high charge and discharge capacity is provided. A positive electrode active material with high charge and discharge voltage is provided. A positive electrode active material that hardly deteriorates is provided. The positive electrode active material is formed through a plurality of heating steps. The second and subsequent heating steps are preferably performed at a temperature higher than or equal to 742° C. and lower than or equal to 920° C. for longer than or equal to an hour and shorter than or equal to 10 hours. Through the heating, magnesium, fluorine, and the like are distributed in a surface portion of the positive electrode active material with preferable concentrations. The crystal structure of general lithium cobalt oxide is easily broken because it becomes the H1-3 phase type crystal structure when being charged at 4.6 V; on the other hand, the positive electrode active material of the present invention has a small ratio of the H1-3 type crystal structure when being charged at 4.6 V, and has the O3′ type crystal structure where a change in the crystal structure from discharging is relatively small, and thus has excellent cycle performance.
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Patent Agency Ranking
公开(公告)号：US20230335733A1
公开(公告)日：2023-10-19
申请号：US18138790
申请日：2023-04-25
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Mayumi MIKAMI , Yohei MOMMA , Kazutaka KURIKI , Kazuhei NARITA
IPC: H01M4/58 , H01M10/0525 , H01M10/0562 , H01M50/446
CPC classification number: H01M4/582 , H01M10/0525 , H01M10/0562 , H01M50/446 , H01M2004/028
Abstract: A conduction path in an all-solid-state secondary battery is difficult to keep with a volume change in an active material due to charging and discharging in some cases. A positive electrode active material with a small volume change between the charged state and the discharged state is used for an all-solid-state secondary battery. For example, a positive electrode active material that has a layered rock-salt crystal structure in the discharged state and a crystal structure similar to the cadmium chloride type crystal structure in the charged state with a depth of charge of approximately 0.8 changes less in its volume and crystal structure between charging and discharging than known positive electrode active materials.
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17.发明公开公开(公告)号：US20230327088A1
公开(公告)日：2023-10-12
申请号：US18204439
申请日：2023-06-01
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 , H01M10/0525 , H01G11/60 , H01M4/505 , H01M4/525 , H01M4/628 , H01G11/50
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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18.发明公开公开(公告)号：US20230290926A1
公开(公告)日：2023-09-14
申请号：US18200204
申请日：2023-05-22
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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19.发明公开公开(公告)号：US20230246183A1
公开(公告)日：2023-08-03
申请号：US18007789
申请日：2021-06-02
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Jo SAITO , Yohei MOMMA , Mayumi MIKAMI , Teruaki OCHIAI , Yusuke YOSHITANI , Azusa KIKUCHI , Kazuhei NARITA
CPC classification number: H01M4/525 , H01M4/366 , H01M4/131 , C01G53/66 , H01M2004/028
Abstract: According to one embodiment of the present invention, a positive electrode active material with high charge and discharge capacity is provided. Alternatively, a positive electrode active material with high charge and discharge voltage is provided. Alternatively, a positive electrode active material with little deterioration is provided. To improve the reliability of the positive electrode active material, the surface of the positive electrode active material is prevented from reacting with an electrolyte solution and being reduced. The provision of a projection on part of the positive electrode active material surface decreases the reduction of the positive electrode active material surface from reacting with the electrolyte solution, thereby improving the cycle performance.
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公开(公告)号：US20230045920A1
公开(公告)日：2023-02-16
申请号：US17792095
申请日：2021-01-06
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Jo SAITO , Yohei MOMMA , Mayumi MIKAMI , Teruaki OCHIAI , Shunpei YAMAZAKI
Abstract: A positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. A positive electrode active material with high charge and discharge capacity is provided. One embodiment of the present invention is a positive electrode active material containing lithium, cobalt, nickel, and oxygen; in which a molar ratio of lithium, cobalt, and nickel is lithium: cobalt: nickel=1:1−x: x (0.3
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