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公开(公告)号：US11448702B2
公开(公告)日：2022-09-20
申请号：US17056206
申请日：2019-05-20
Inventor： Yuto Horiuchi , Taisuke Yamamoto
IPC: H02J7/04 , G01R31/378 , G01R31/382 , H02J7/00 , H01M10/44 , H01M10/48 , H01M4/134 , H01M4/62 , H01M4/02
Abstract: A method for charging a nonaqueous electrolyte secondary battery includes a first charging step of charging a first capacity Q1st at a first constant current value I1st, the first capacity Q1st including a capacity range in which dQSi/dQ is more than or equal to a predetermined threshold value, a second charging step of charging a second capacity at a second constant current value more than the first constant current value, a detection step of acquiring at least one of dV/dQ and dQSi/dQ, and a changing step of changing at least one of the timing of switching between the first charging step and the second charging step and the first constant current value I1st on the basis of a change in time of dV/dQ or dQSi/dQ.
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公开(公告)号：US11362321B2
公开(公告)日：2022-06-14
申请号：US16498205
申请日：2018-02-14
Inventor： Tatsuya Akira , Taisuke Yamamoto
Abstract: A negative electrode material includes a graphite material, an alkali metal salt, and at least one metal material selected from the group consisting of Fe, Mn, Mg, Ni, Pd, Rh, Os, and Pt. The graphite material contains natural graphite.
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公开(公告)号：US20210364575A1
公开(公告)日：2021-11-25
申请号：US17056206
申请日：2019-05-20
Inventor： Yuto Horiuchi , Taisuke Yamamoto
IPC: G01R31/378 , H01M10/44 , H01M10/48 , H02J7/00 , G01R31/382
Abstract: A method for charging a nonaqueous electrolyte secondary battery includes a first charging step of charging a first capacity Q1st at a first constant current value I1st, the first capacity Q1st including a capacity range in which dQSi/dQ is more than or equal to a predetermined threshold value, a second charging step of charging a second capacity at a second constant current value more than the first constant current value, a detection step of acquiring at least one of dV/dQ and dQSi/dQ, and a changing step of changing at least one of the timing of switching between the first charging step and the second charging step and the first constant current value I1st on the basis of a change in time of dV/dQ or dQSi/dQ.
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公开(公告)号：US11949091B2
公开(公告)日：2024-04-02
申请号：US16975820
申请日：2019-01-25
Inventor： Masahiro Soga , Taisuke Yamamoto
CPC classification number: H01M4/133 , H01M4/131 , H01M4/134 , H01M10/0525 , H01M10/44 , H01M10/48 , H01M2004/027
Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q (0.1≤x≤0.5), charging is performed at a first fixed current value I1st that satisfies the expression below; and a high current charging step in which after completion of the first charging step, charging is performed at a fixed current value Imax higher than the first fixed current value I1st.
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公开(公告)号：US11196040B2
公开(公告)日：2021-12-07
申请号：US16464817
申请日：2017-11-17
Inventor： Yohei Uchiyama , Taisuke Yamamoto , Tatsuya Akira , Norihisa Yamamoto , Hiroshi Minami
Abstract: Disclosed is a negative electrode material including: a lithium silicate phase that contains a lithium silicate; and silicon particles that are dispersed in the lithium silicate phase, wherein the silicon particles have a crystallite size of 10 nm or more, and the lithium silicate has a composition represented by the following formula: Li2Si2O5.(x−2)SiO2, where 2
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Patent Agency Ranking
公开(公告)号：US11271197B2
公开(公告)日：2022-03-08
申请号：US16497609
申请日：2018-02-16
Inventor： Taisuke Asano , Yohei Uchiyama , Taisuke Yamamoto , Tatsuya Akira , Norihisa Yamamoto , Hiroshi Minami
Abstract: Disclosed is a negative electrode material for a non-aqueous electrolyte secondary battery, including: a lithium silicate phase; silicon particles dispersed in the lithium silicate phase; and at least one element Me dispersed in the lithium silicate phase, and selected from the group consisting of a rare-earth element and an alkaline-earth metal. The composition of the lithium silicate phase is represented, for example, by the formula: Li2zSiO2+z, and satisfies 0
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公开(公告)号：US20190319261A1
公开(公告)日：2019-10-17
申请号：US16464817
申请日：2017-11-17
Inventor： Yohei Uchiyama , Taisuke Yamamoto , Tatsuya Akira , Norihisa Yamamoto , Hiroshi Minami
Abstract: Disclosed is a negative electrode material including: a lithium silicate phase that contains a lithium silicate; and silicon particles that are dispersed in the lithium silicate phase, wherein the silicon particles have a crystallite size of 10 nm or more, and the lithium silicate has a composition represented by the following formula: Li2Si2O5.(x−2)SiO2, where 2
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公开(公告)号：US20200350591A1
公开(公告)日：2020-11-05
申请号：US16767774
申请日：2018-10-26
Inventor： Yohei Uchiyama , Taisuke Yamamoto , Tatsuya Akira , Norihisa Yamamoto , Hiroshi Minami
Abstract: A lithium battery including a negative electrode having a negative electrode active material layer that contains lithium silicate particles and a binder. The lithium silicate particles include composite particles including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, wherein a carbon material is present inside the composite particles, and an area ratio of the carbon material occupying a cross section of the composite particles is 0.008 to 6%. The binder includes at least a first resin, wherein the first resin is at least cue selected from the group consisting of polyacrylic acid, a polyacrylic acid salt, and their derivatives. The first resin is contained in an amount of 2 mass % or less in the negative electrode active material layer.
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公开(公告)号：US11984604B2
公开(公告)日：2024-05-14
申请号：US16767774
申请日：2018-10-26
Inventor： Yohei Uchiyama , Taisuke Yamamoto , Tatsuya Akira , Norihisa Yamamoto , Hiroshi Minami
CPC classification number: H01M4/661 , H01M4/131 , H01M4/386 , H01M4/583 , H01M4/622 , H01M10/0525 , H01M2004/021 , H01M2004/027 , H01M2004/028
Abstract: A lithium ion battery including a negative electrode having a negative electrode active material layer that contains lithium silicate particles and a binder. The lithium silicate particles include composite particles including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, wherein a carbon material is present inside the composite particles, and an area ratio of the carbon material occupying a cross section of the composite particles is 0.008 to 6%. The binder includes at least a first resin, wherein the first resin is at least cue selected from the group consisting of polyacrylic acid, a polyacrylic acid salt, and their derivatives. The first resin is contained in an amount of 2 mass % or less in the negative electrode active material layer.
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公开(公告)号：US11916220B2
公开(公告)日：2024-02-27
申请号：US16975820
申请日：2019-01-25
Inventor： Masahiro Soga , Taisuke Yamamoto
CPC classification number: H01M4/133 , H01M4/131 , H01M4/134 , H01M10/0525 , H01M10/44 , H01M10/48 , H01M2004/027
Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q (0.1≤x≤0.5), charging is performed at a first fixed current value I1st that satisfies the expression below; and a high current charging step in which after completion of the first charging step, charging is performed at a fixed current value Imax higher than the first fixed current value I1st.
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