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公开(公告)号：US11990606B2
公开(公告)日：2024-05-21
申请号：US16957156
申请日：2018-10-29
Inventor： Yohei Uchiyama , Norihisa Yamamoto , Tatsuya Akira
IPC: H01M4/36 , H01M4/02 , H01M4/38 , H01M4/58 , H01M10/0525
CPC classification number: H01M4/362 , H01M4/38 , H01M4/5825 , H01M10/0525 , H01M2004/027
Abstract: A negative electrode active material for non-aqueous electrolyte secondary batteries, including: lithium silicate composite particles including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, the lithium silicate phase being an oxide phase including Li, Si, O, and M, where M is an element other than the following elements: Group 1 elements of alkali metals, Group 16 elements of oxygen group, Group 18 elements of rare gas, and Si. An amount of each element relative to a total amount of Li, Si and M in the lithium silicate phase is 3 to 55 mol % for Li, 25 mol % or more for Si, and 3 to 50 mol % for M. A carbon material is present inside the lithium silicate composite particles; and an area ratio of the carbon material occupying a cross section of the composite particles is 0.008 to 6%.
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公开(公告)号：US20240145761A1
公开(公告)日：2024-05-02
申请号：US18574233
申请日：2022-06-20
Inventor： Yohei Uchiyama
IPC: H01M10/052 , H01M10/0568 , H01M10/0569
CPC classification number: H01M10/052 , H01M10/0568 , H01M10/0569
Abstract: Disclosed is a lithium secondary battery (10) including a positive electrode (11) containing a positive electrode active material capable of absorbing and releasing lithium ions, a negative electrode (12) including a negative electrode current collector, a separator (13) disposed between the positive electrode (11) and the negative electrode (12), and a nonaqueous electrolyte having lithium ion conductivity. At the negative electrode, lithium metal deposits during charging, and the lithium metal dissolves during discharging. The oxygen content in the negative electrode current collector is 50 ppm or less, and the negative electrode current collector has a breaking strength of 300 MPa or less and has a breaking elongation of 4% or more.
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公开(公告)号：US11715822B2
公开(公告)日：2023-08-01
申请号：US16650236
申请日：2018-09-26
Inventor： Norihisa Yamamoto , Yohei Uchiyama , Tatsuya Akira , Kazuro Hayashida
CPC classification number: H01M4/364 , H01M4/134 , H01M4/136 , H01M4/366 , H01M4/386 , H01M4/5825 , H01M4/625 , H01M10/0525 , H01M2004/027
Abstract: Negative electrode active material particles comprise base particles having: a silicate phase containing Li2O, SiO2, at least one oxide selected from M12O3, M2O2, M32O5, and M4O3 (where M1, M2, M3, and M4 are elements other than alkali metals, alkali earth metals, and Si), and a discretionary component MO (where M is an alkali earth metal); and silicon particles dispersed in the silicate phase. The element contents for the elements contained in the silicate phase are: 3-33 mol % of Li; 40-78 mol % of S; and 1-40 mol % of M1, M2, M3, and M4. If MO is contained, the M content in the silicate phase is 1-10 mol %.
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公开(公告)号：US20230207791A1
公开(公告)日：2023-06-29
申请号：US17927321
申请日：2021-05-26
Inventor： Yohei Uchiyama , Yosuke Sato
CPC classification number: H01M4/386 , H01M4/134 , C01B33/32 , H01M2004/027
Abstract: A negative electrode active material for a secondary battery includes a lithium silicate phase; and a silicon phase dispersed in the lithium silicate phase. The lithium silicate phase contains at least one element M selected from the group consisting of alkali metals (except lithium), Group II elements, rare-earth elements, zirconium (Zr), niobium (Nb), tantalum (Ta), vanadium (V), titanium (Ti), phosphorus (P), bismuth (Bi), zinc (Zn), tin (Sn), lead (Pb), antimony (Sb), cobalt (Co), fluorine (F), tungsten (W), aluminum (Al), and boron (B). An electron diffraction image of the negative electrode active material obtained using a transmission electron microscope has a spot image.
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公开(公告)号：US20230057606A1
公开(公告)日：2023-02-23
申请号：US17794359
申请日：2021-01-26
Inventor： Yohei Uchiyama , Keita Okazaki
IPC: H01M4/1395 , H01M10/0525 , H01M4/62
Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode current collector, and a negative electrode mixture layer supported on the negative electrode current collector. The negative electrode mixture layer includes a negative electrode active material capable of electrochemically absorbing and releasing lithium ions, a binder, and a conductive agent. The negative electrode active material includes flaky silicon particles, and the binder includes a silicate.
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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：US20220029151A1
公开(公告)日：2022-01-27
申请号：US17311818
申请日：2019-12-04
Inventor： Yosuke Sato , Yohei Uchiyama , Taisuke Asano
Abstract: A negative electrode active material for a secondary battery includes a silicate composite particle. The silicate composite particle contains silicate phases, silicon particles dispersed in the silicate phases, and a carbon phase. The silicate phases contain at least one selected from the group consisting of an alkali metal and an alkaline earth metal. At least parts of the carbon phase coat at least parts of surfaces of the silicon particles.
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公开(公告)号：US20210202930A1
公开(公告)日：2021-07-01
申请号：US16650236
申请日：2018-09-26
Inventor： Norihisa Yamamoto , Yohei Uchiyama , Tatsuya Akira , Kazuro Hayashida
Abstract: Negative electrode active material particles comprise base particles having: a silicate phase containing Li2O, SiO2, at least one oxide selected from M12O3, M2O2, M32O5, and M4O3 (where M1, M2, M3, and M4 are elements other than alkali metals, alkali earth metals, and Si), and a discretionary component MO (where M is an alkali earth metal); and silicon particles dispersed in the silicate phase. The element contents for the elements contained in the silicate phase are: 3-33 mol % of Li; 40-78 mol % of S; and 1-40 mol % of M1, M2, M3, and M4. If MO is contained, the M content in the silicate phase is 1-10 mol %.
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公开(公告)号：US20210167367A1
公开(公告)日：2021-06-03
申请号：US17267231
申请日：2019-08-23
Inventor： Yohei Uchiyama , Norihisa Yamamoto , Keita Okazaki
Abstract: A negative electrode active material for a secondary battery includes silicate composite particles each of which contain a silicate phase and silicon particles dispersed in the silicate phase, the silicate phase is an oxide phase containing Si, O, and alkali metals, the alkali metals include at least Na and Li, and an atomic ratio: Na/Li of Na to Li is 0.1 to 7.1.
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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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