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公开(公告)号：US12237495B2
公开(公告)日：2025-02-25
申请号：US18140877
申请日：2023-04-28
Inventor： Yuki Tokuda , Hideharu Takezawa , Yuko Ogawa , Hiroyuki Okuda
IPC: H01M4/13 , H01M10/0525 , H01M10/0587 , H01M50/531 , H01M50/534 , H01M50/536 , H01M50/586 , H01M50/595
Abstract: An electrode group includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a positive electrode lead electrically connected to the positive electrode. The positive electrode includes a positive electrode current collector and a positive electrode active material layer carried on each main surface of the positive electrode current collector. The positive electrode current collector has an exposed section that does not carry the positive electrode active material layer. The negative electrode includes a negative electrode current collector and a negative electrode active material layer carried on each main surface of the negative electrode current collector and has a first region and a second region. The mass of the negative electrode active material layer in the first region per unit area is smaller than the mass of the negative electrode active material layer in the second region per unit area.
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公开(公告)号：US20230318049A1
公开(公告)日：2023-10-05
申请号：US18028695
申请日：2021-08-18
Inventor： Hiroyuki Matsumoto , Kazuhiro Iida , Hideharu Takezawa
IPC: H01M10/42 , H01M10/0525 , H01M10/056
CPC classification number: H01M10/4235 , H01M10/0525 , H01M10/056 , H01M2300/0088
Abstract: This lithium ion secondary battery comprises a negative electrode, a positive electrode, a non-aqueous electrolyte including a lithium salt, and an aqueous electrolyte including a lithium salt, wherein: among the negative electrode and the positive electrode, the aqueous electrolyte contacts only the positive electrode; among the negative electrode and the positive electrode, the non-aqueous electrolyte contacts at least the negative electrode; the positive electrode contains a positive electrode active material; the positive electrode active material contains a lithium transition metal composite oxide and a surface modification layer formed on the surface of primary particles of the lithium transition metal composite oxide; and the surface modification layer contains an alkali earth metal element.
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公开(公告)号：US11664503B2
公开(公告)日：2023-05-30
申请号：US16695920
申请日：2019-11-26
Inventor： Takahito Nakayama , Tomoki Shiozaki , Hideharu Takezawa
CPC classification number: H01M4/668 , H01M4/364 , H01M4/58 , H01M2004/027 , H01M2004/028
Abstract: This secondary battery positive electrode is provided with a positive-electrode current collector, a positive-electrode mixture layer, and an intermediate layer disposed between the positive-electrode current collector and the positive-electrode mixture layer. The intermediate layer comprises: a first intermediate layer that includes a non-oxide conductive inorganic compound and a positive-electrode active material; and a second intermediate layer that includes an insulating inorganic material and a non-oxide conductive inorganic compound. The conductive inorganic compound becomes an insulating oxide at 300° C. or above.
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公开(公告)号：US11462773B2
公开(公告)日：2022-10-04
申请号：US16659774
申请日：2019-10-22
Inventor： Yuji Oura , Tomoki Shiozaki , Hideharu Takezawa , Takahito Nakayama , Takahiro Takahashi , Daisuke Furusawa
Abstract: A secondary battery positive electrode is provided with: a positive electrode current collector; a positive electrode mixture layer; and an intermediate layer disposed between the positive electrode current collector and the positive electrode mixture layer. The intermediate layer comprises first particles configured from an electrically conductive material, and second particles which are configured from an insulating inorganic material and have an average grain size greater than an average grain size of the first particles. The volume ratio of the first particles in the intermediate layer is not less than 25% and less than 70%. The volume ratio of the second particles in the intermediate layer is not less than 30% and less than 75%. The density of the intermediate layer is greater than 1 g/cm3 and not more than 2.5 g/cm3.
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公开(公告)号：US20220149385A1
公开(公告)日：2022-05-12
申请号：US17585919
申请日：2022-01-27
Inventor： Yuji Oura , Tomoki Shiozaki , Hideharu Takezawa
Abstract: This positive electrode for secondary batteries is provided with: a positive electrode collector which has a plurality of recesses and projections in the surface; an intermediate layer which is provided on the surface of the positive electrode collector having the recesses and projections; and a positive electrode mixture layer which is provided on the intermediate layer and contains a positive electrode active material. This positive electrode for secondary batteries is configured such that: the intermediate layer contains conductive material particles and inorganic material particles that have a higher resistance than the positive electrode active material; and both the ratio of the central particle diameter of the conductive material particles to the average depth of the recesses and projections of the positive electrode collector and the ratio of the central particle diameter of the inorganic material particles to the average depth of the recesses and projections of the positive electrode collector are 5:6 or less.
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Patent Agency Ranking
公开(公告)号：US20210075002A1
公开(公告)日：2021-03-11
申请号：US17040693
申请日：2019-02-22
Inventor： Takahito Nakayama , Tomoki Shiozaki , Hideharu Takezawa
Abstract: A positive electrode (11) according to one embodiment is provided with: a positive electrode collector (30); a first middle layer (32) disposed on one of two surfaces of the positive electrode collector (30), the surface being on the inner circumferential side when the positive electrode collector (30) is wound; a second middle layer (34) that is disposed on the other surface that is on the outer circumferential side; and a positive electrode mixed material layer (36) disposed on the first middle layer (32) and on the second middle layer (34). The first middle layer (32) and the second middle layer (34) contain insulating particles and an electrical conductor, and the thickness of the first middle layer (32) is less than the thickness of the second middle layer (34).
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公开(公告)号：US20210013516A1
公开(公告)日：2021-01-14
申请号：US16977579
申请日：2019-01-15
Inventor： Kohei Saito , Takahiro Takahashi , Hideharu Takezawa , Tomoki Shiozaki
IPC: H01M4/66
Abstract: This positive electrode includes: a positive electrode current collector; a positive electrode mixed material layer that is formed on at least one surface of the positive electrode current collector; and a protective layer which includes an insulating inorganic compound and a conductive material, and is interposed between the positive electrode current collector and the positive electrode mixed material layer. The protective layer includes secondary particles comprising agglomerated primary particles of the inorganic compound. The median value of the particle size of the secondary particles is 30 μm or less.
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公开(公告)号：US20200091515A1
公开(公告)日：2020-03-19
申请号：US16689387
申请日：2019-11-20
Inventor： Hideharu Takezawa , Tomoki Shiozaki
IPC: H01M4/525 , H01M4/36 , H01M10/0525 , H01M4/485
Abstract: A positive electrode with a positive electrode current collector and a positive electrode mixture layer, and the positive electrode mixture layer has first and second positive electrode mixture layers. The first positive electrode mixture layer comprises a positive electrode active material composed of compound A that contains Ni, Co, Al and Li. The second positive electrode mixture layer is disposed between the first positive electrode mixture layer and the positive electrode current collector, and comprises a positive electrode active material including: said compound A; and a Li-containing compound B which is smaller in specific capacity (mAh/g) and average particle diameter than said compound A. In said compound A, a ratio of Ni to the total number of moles of the metal elements except Li is 82 mol % or more. The average particle diameter of said compound B is 55% or less of the average particle diameter of said compound A.
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公开(公告)号：US20250015363A1
公开(公告)日：2025-01-09
申请号：US18291342
申请日：2022-06-21
Inventor： Kazuhiro Iida , Hideharu Takezawa
IPC: H01M10/26 , H01M4/38 , H01M4/525 , H01M10/0525 , H01M10/0565
Abstract: This lithium ion secondary battery has a negative electrode, a positive electrode, an aqueous electrolyte containing a lithium salt, and a separation layer arranged between the negative electrode and the positive electrode. The aqueous electrolyte is in contact with the positive electrode, and the separation layer includes a non-aqueous solid electrolyte A in which a matrix polymer, the lithium salt and a hydrophobic ionic liquid are compounded.
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公开(公告)号：US12155041B2
公开(公告)日：2024-11-26
申请号：US17282094
申请日：2019-09-24
Inventor： Hiroyuki Okuda , Hideharu Takezawa , Yuko Ogawa , Yuki Tokuda
IPC: H01M10/0587 , H01M4/36 , H01M4/48 , H01M4/505 , H01M4/525 , H01M4/587 , H01M50/183 , H01M50/531 , H01M50/534 , H01M50/536
Abstract: The cylindrical secondary battery is provided with a wound electrode body, a positive electrode tab connected to a positive electrode, a cylindrical case body for housing the electrode body and the positive electrode tab, and a sealing body for sealing an opening of the case body. A negative electrode has, at a winding end of the negative electrode, a negative electrode current collector exposure section where no negative electrode active material layer is disposed, and the negative electrode current collector exposure section is disposed in contact with an inner surface of the case body. The positive electrode tab is disposed at the center in the longitudinal direction of the positive electrode and in a region where the number of layers of the positive electrode in a radial direction is smaller than in other regions in a cross-sectional area of the wound electrode body.
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