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公开(公告)号：US20220344659A1
公开(公告)日：2022-10-27
申请号：US17763021
申请日：2020-07-21
Inventor： Yuji Oura , Kazuhiro Yoshii , Yuta Kuroda
IPC: H01M4/583 , H01M10/0525 , H01M4/36 , H01M4/40
Abstract: This negative electrode is provided with a negative electrode current collector, and a negative electrode mixture layer formed on the negative electrode current collector, wherein: the negative electrode mixture layer comprises a first layer arranged on the negative electrode current collector, and a second layer arranged on the first layer; the second layer includes graphite particles A having a particle internal porosity of at most 10%: the first layer includes graphite particles B having a particle internal porosity of more than 10%; and the second layer has a water contact angle of at most 50°.
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公开(公告)号：US10895605B2
公开(公告)日：2021-01-19
申请号：US16141118
申请日：2018-09-25
Inventor： Yuta Kuroda , Masanobu Takeuchi
IPC: G01R31/392 , H01M10/48 , G01R31/3842 , H02J7/00 , H01M10/44 , G01R31/36 , H01M10/0525
Abstract: A life estimation apparatus includes a second calculation unit that calculates a remaining capacity, which is a capacity with which the lithium ion secondary cell is capable of being charged or which the lithium ion secondary cell is capable of discharging, based on Equation 1 having an exponent n1 of 0.9 to 1.1 and Equation 2 having an exponent n2 of 0.4 to 0.6. The second calculation unit calculates the remaining capacity using Equation 1 if the amount of change of open circuit voltage, the amount of change of a voltage rise width, or the amount of change of a voltage rise rate has a positive value and calculates the remaining capacity using Equation 2 if the amount of change of the open circuit voltage, the amount of change of the voltage rise width, or the amount of change of the voltage rise rate has a negative value.
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公开(公告)号：US20250096264A1
公开(公告)日：2025-03-20
申请号：US18580814
申请日：2022-07-12
Inventor： Yuta Kuroda , Yosuke Sato , Keiko Kato
Abstract: A negative electrode for a secondary battery includes a negative electrode current collector and a negative electrode mixture layer including a negative electrode active material, wherein the negative electrode active material includes carbon particles and Si-containing particles, and in a distribution in a plane direction of the negative electrode mixture layer of a presence probability of Si element in a thickness direction of the negative electrode mixture layer, a difference of an upper limit value Rmax and a lower limit value Rmin in a 1σ region: Rmax−Rmin is 20% or less.
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公开(公告)号：US20200168907A1
公开(公告)日：2020-05-28
申请号：US16634998
申请日：2018-07-19
Inventor： Manabu Takijiri , Yuta Kuroda
IPC: H01M4/505 , H01M10/0569 , H01M4/525 , H01M10/0525
Abstract: This nonaqueous electrolyte secondary battery is provided with a positive electrode, a negative electrode and a nonaqueous electrolyte. The nonaqueous electrolyte comprises a nonaqueous solvent that contains a fluorine-containing cyclic carbonate; the positive electrode comprises a positive electrode active material that contains composite oxide particles which contain Ni, Co and Li, while containing at least one of Mn and Al, and wherein the proportion of Ni relative to the total number of moles of the metal elements excluding Li is 50% by mole or more; and the composite oxide particles are in a non-aggregated state, while having a compressive strength of 250 MPa or more.
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公开(公告)号：US20220190328A1
公开(公告)日：2022-06-16
申请号：US17442051
申请日：2020-02-17
Inventor： Yuta Kuroda , Ryo Kazama
IPC: H01M4/38 , H01M4/134 , H01M10/0525 , H01M10/0568 , H01M10/0569 , H01M4/36 , H01M4/583
Abstract: A negative electrode for a non-aqueous electrolyte secondary battery including a negative electrode mixture layer including a negative electrode active material and a negative electrode additive, the negative electrode active material including a carbon material and a Si-containing material, the content of the Si-containing material in the negative electrode mixture layer being 5 mass % or more, and the negative electrode additive including a formaldehyde condensate of an aromatic organic acid having a hydroxyl group and/or an aromatic organic acid salt having a hydroxyl group.
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Patent Agency Ranking
公开(公告)号：US20210167396A1
公开(公告)日：2021-06-03
申请号：US17045261
申请日：2019-02-22
Inventor： Ryo Kazama , Yuta Kuroda , Manabu Takijiri
IPC: H01M4/62 , H01M4/525 , H01M4/38 , H01M4/36 , H01M10/0525
Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure comprises a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode has: a positive electrode current collector; and a positive electrode active material layer that is provided to the surface of the positive electrode current collector and includes a positive electrode active material and a positive electrode additive. The positive electrode active material contains a lithium-nickel composite oxide having a compressive breaking strength of at least 130 MPa and including at least 50 mol % of nickel relative to the total quantity of metals other than lithium. The positive electrode additive contains a lithium-containing metal oxide that has an antifluorite structure.
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公开(公告)号：US20190025381A1
公开(公告)日：2019-01-24
申请号：US16141118
申请日：2018-09-25
Inventor： Yuta Kuroda , Masanobu Takeuchi
IPC: G01R31/36 , H01M10/0525 , H01M10/48
Abstract: A life estimation apparatus includes a second calculation unit that calculates a remaining capacity, which is a capacity with which the lithium ion secondary cell is capable of being charged or which the lithium ion secondary cell is capable of discharging, based on Equation 1 having an exponent n1 of 0.9 to 1.1 and Equation 2 having an exponent n2 of 0.4 to 0.6. The second calculation unit calculates the remaining capacity using Equation 1 if the amount of change of open circuit voltage, the amount of change of a voltage rise width, or the amount of change of a voltage rise rate has a positive value and calculates the remaining capacity using Equation 2 if the amount of change of the open circuit voltage, the amount of change of the voltage rise width, or the amount of change of the voltage rise rate has a negative value.
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公开(公告)号：US12046748B2
公开(公告)日：2024-07-23
申请号：US16635018
申请日：2018-07-19
Inventor： Yuta Kuroda , Manabu Takijiri
IPC: H01M4/505 , H01M4/525 , H01M10/0525 , H01M4/02
CPC classification number: H01M4/505 , H01M4/525 , H01M10/0525 , H01M2004/021 , H01M2004/028
Abstract: A non-aqueous electrolyte secondary battery according to one embodiment of the present disclosure is provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode active material containing a composite oxide particle that includes Ni, Co and Li, and also includes at least one among Mn and Al, and the ratio of Ni to the total number of moles of metal elements excluding Li is 50 mol % or more. In the composite oxide particle, the ratio (A/B) of a BET specific surface area (A) to a theoretical specific surface area (B) determined by the following formula is more than 1.0 and less than 3.3. Theoretical specific surface area (B) (m2/g)=6/(true density (g/cm3)×volume average particle diameter (μm)).
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9.发明申请公开(公告)号：US20220376227A1
公开(公告)日：2022-11-24
申请号：US17763087
申请日：2020-07-21
Inventor： Yuta Kuroda , Kazuhiro Yoshii , Yuji Oura
IPC: H01M4/36 , H01M10/0525 , H01M4/583
Abstract: A negative electrode for lithium ion secondary batteries according to the present invention is provided with a negative electrode collector and a negative electrode mixture layer that is formed on the negative electrode collector; the negative electrode mixture layer comprises a negative electrode active material which contains graphite particles A that have an internal porosity of 10% or less, graphite particles B that have an internal porosity of more than 10%, and an alloying material that is alloyed with lithium; and the content of the alloying material is 15% by mass or less relative to the total amount of the negative electrode active material in the negative electrode mixture layer.
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公开(公告)号：US20200243856A1
公开(公告)日：2020-07-30
申请号：US16635018
申请日：2018-07-19
Inventor： Yuta Kuroda , Manabu Takijiri
IPC: H01M4/505 , H01M4/525 , H01M10/0525
Abstract: A non-aqueous electrolyte secondary battery according to one embodiment of the present disclosure is provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode active material containing a composite oxide particle that includes Ni, Co and Li, and also includes at least one among Mn and Al, and the ratio of Ni to the total number of moles of metal elements excluding Li is 50 mol % or more. In the composite oxide particle, the ratio (A/B) of a BET specific surface area (A) to a theoretical specific surface area (B) determined by the following formula is more than 1.0 and less than 3.3. Theoretical specific surface area (B) (m2/g)=6/(true density (g/cm3)×volume average particle diameter (μm)).
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