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公开(公告)号：US20220359870A1
公开(公告)日：2022-11-10
申请号：US17734744
申请日：2022-05-02
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Mayumi MIKAMI , Jo SAITO , Kazuki TANEMURA , Tatsuyoshi TAKAHASHI , Yohei MOMMA , Kazuya SHIMADA , Kunihiro FUKUSHIMA
IPC: H01M4/525
Abstract: A positive electrode active material in which a discharge capacity decrease due to charge and discharge cycles is suppressed and a secondary battery including the positive electrode active material are provided. A positive electrode active material in which a change in a crystal structure, e.g., a shift in CoO2 layers is small between a discharged state and a high-voltage charged state is provided. For example, a positive electrode active material that has a layered rock-salt crystal structure belonging to the space group R-3m in a discharged state and a crystal structure belonging to the space group P2/m in a charged state where x in LixCoO2 is greater than 0.1 and less than or equal to 0.24 is provided. When the positive electrode active material is analyzed by powder X-ray diffraction, a diffraction pattern has at least diffraction peaks at 2θ of 19.47±0.10° and 2θ of 45.62±0.05°.
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公开(公告)号：US20220179007A1
公开(公告)日：2022-06-09
申请号：US17441324
申请日：2020-03-23
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Akihiro CHIDA , Mayumi MIKAMI
IPC: G01R31/388 , H01M10/48 , G01R31/367 , H02J7/00
Abstract: A method of estimating the state of charge of a secondary battery that has high estimation accuracy even when degradation of the secondary battery progresses is provided. Furthermore, a capacity measurement system of a secondary battery that estimates an SOC with high estimation accuracy in a short time at low cost is provided. When the capacity of a secondary battery can be estimated with high accuracy, an anomaly can also be detected in accordance with the value. A novel method of detecting an anomaly of a secondary battery is provided. In the CCCV charging method, the CC time and the CV time are used as learning parameters to construct a learning model. With this learning model, an estimated capacity value with high accuracy can be obtained with use of two data, which are the CC time and the CV time, or three data, which are the CC time, the CV time, and a charge inception voltage value as the minimum input data.
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公开(公告)号：US20220173394A1
公开(公告)日：2022-06-02
申请号：US17441808
申请日：2020-03-23
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Yohei MOMMA , Teruaki OCHIAI , Mayumi MIKAMI , Jo SAITO , Masahiro TAKAHASHI
Abstract: A method for forming a positive electrode active material of a lithium ion secondary battery is provided. The method for forming a positive electrode active material includes a first step of placing a first container in which a mixture of a lithium oxide, a fluoride, and a magnesium compound are put, in a heating furnace, a second step of providing an atmosphere including oxygen in an inside of the heating furnace, and a third step of heating the inside of the heating furnace. The third step is performed after the first step and the second step are performed. Preferably, an atmosphere including oxygen is provided in the heating furnace before the inside of the heating furnace is heated. More preferably, the fluoride is lithium fluoride and the magnesium compound is magnesium fluoride.
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公开(公告)号：US20210391575A1
公开(公告)日：2021-12-16
申请号：US17290841
申请日：2019-11-05
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Mayumi MIKAMI , Ryota TAJIMA
IPC: H01M4/525 , H01M4/505 , H01M10/0525 , C01G51/00 , C01G53/00
Abstract: A positive electrode active material, which has high capacity and excellent charge and discharge cycle performance, for a lithium-ion secondary battery is provided. The positive electrode active material contains lithium, cobalt, an element X, and fluorine, and includes a region represented by a layered rock-salt structure. The space group of the region is represented by R-3m. The element X is one or more selected from elements that have a property in which ΔE3 obtained by subtracting, from the stabilization energy in the case of substitution of the element at a lithium position in lithium cobalt oxide, the stabilization energy before the substitution is smaller than ΔE4 obtained by subtracting, from the stabilization energy in the case of substitution of the element at a cobalt position in lithium cobalt oxide, the stabilization energy before the substitution. ΔE3 and ΔE4 are calculated by the first-principles calculation.
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公开(公告)号：US20210020935A1
公开(公告)日：2021-01-21
申请号：US17036611
申请日：2020-09-29
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Masahiro TAKAHASHI , Mayumi MIKAMI , Yohei MOMMA , Teruaki OCHIAI , Jyo SAITOU
IPC: H01M4/525 , C01G51/00 , C01G53/00 , H01M10/0525
Abstract: A 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 charging and discharging as compared with those of a known positive electrode active material. In order to form the positive electrode active material having the pseudo-spinel crystal structure in the charged state, it is preferable that a halogen source such as a fluorine and a magnesium source be mixed with particles of a composite oxide containing lithium, a transition metal, and oxygen, which is synthesized in advance, and then the mixture be heated at an appropriate temperature for an appropriate time.
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Patent Agency Ranking
公开(公告)号：US20210020910A1
公开(公告)日：2021-01-21
申请号：US17064724
申请日：2020-10-07
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Teruaki OCHIAI , Takahiro KAWAKAMI , Mayumi MIKAMI , Yohei MOMMA , Masahiro TAKAHASHI , Ayae TSURUTA
IPC: H01M4/134 , H01M4/131 , H01M4/525 , H01M4/36 , H01M10/0525
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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27.发明申请公开(公告)号：US20200343530A1
公开(公告)日：2020-10-29
申请号：US16923494
申请日：2020-07-08
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 , H01M4/86
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：US20250158054A1
公开(公告)日：2025-05-15
申请号：US19023705
申请日：2025-01-16
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Jyo SAITO , Mayumi MIKAMI , Yohei MOMMA , Teruaki OCHIAI , Tatsuyoshi TAKAHASHI , Kazuhei NARITA
IPC: H01M4/525 , H01M4/02 , H01M4/36 , H01M10/0525 , H01M10/0569
Abstract: A positive electrode active material that has high capacity and excellent charge and discharge cycle performance for a secondary battery is provided. A positive electrode active material that inhibits a decrease in capacity in charge and discharge cycles is provided. A high-capacity secondary battery is provided. A secondary battery with excellent charge and discharge characteristics is provided. A highly safe or reliable secondary battery is provided. A positive electrode active material contains lithium, cobalt, oxygen, and aluminum and has a crystal structure belonging to a space group R-3m when Rietveld analysis is performed on a pattern obtained by powder X-ray diffraction. In analysis by X-ray photoelectron spectroscopy, the number of aluminum atoms is less than or equal to 0.2 times the number of cobalt atoms.
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公开(公告)号：US20240170993A1
公开(公告)日：2024-05-23
申请号：US18548353
申请日：2022-02-24
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Kazuki TANEMURA , Mayumi MIKAMI , Takeshi OSADA , Yohei MOMMA , Tetsuji ISHITANI , Haruki KATAGIRI
CPC classification number: H02J7/04 , H01M4/525 , H01M10/443 , H02J7/0047 , H02J7/007182
Abstract: A power storage system with a high energy density is provided. A power storage system with a high degree of safety is provided. A secondary battery with a high energy density is provided. A secondary battery with a high degree of safety is provided. A charging unit has a function of controlling start and stop of charge of a secondary battery and a function of controlling a charge current of the secondary battery. The secondary battery includes a positive electrode, the positive electrode includes a positive electrode active material particle, the positive electrode active material particle is lithium cobalt oxide to which magnesium is added. The charging unit has a function of controlling charge of the secondary battery by a first step of starting constant current charge of the secondary battery at a time t1; and a second step of stopping the charge at a time t2. A crystal structure of the lithium cobalt oxide at the time t2, which is determined by powder X-ray diffraction, is a crystal structure represented by a space group R-3m.
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公开(公告)号：US20240036117A1
公开(公告)日：2024-02-01
申请号：US18359999
申请日：2023-07-27
Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Inventor： Kazuki TANEMURA , Mayumi MIKAMI , Kazuki HIGASHI , Haruki KATAGIRI , Kyoichi MUKAO
IPC: G01R31/3835 , G01R31/36
CPC classification number: G01R31/3835 , G01R31/3646 , G01R31/3648
Abstract: A battery evaluation system that performs evaluation by easily linking a plurality of measurement methods relating to a secondary battery is provided. A charge and discharge device is configured to perform, in a first period, either or both of charge and discharge of a secondary battery. The first measurement device is configured to perform, in the first period, measurement of a spectrum a plurality of times. The arithmetic portion is configured to generate a first graph using the plurality of measured spectra. The arithmetic portion is configured to generate data of a second graph using a set of data including a voltage and the time of measurement of the voltage. A display portion is configured to display the first graph and the second graph at the same time. The battery evaluation system is configured to set a first area in one of the first graph and the second graph and to display a second area corresponding to the first area in the other of the first graph and the second graph.
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