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公开(公告)号：US20200052303A1
公开(公告)日：2020-02-13
申请号：US16659770
申请日：2019-10-22
Inventor： Takahiro Takahashi , Takahito Nakayama , Tomoki Shiozaki , Hideharu Takezawa , Daisuke Furusawa , Yuji Oura
Abstract: Provided is a secondary battery comprising a positive electrode, a negative electrode, and an electrolyte. The positive electrode is provided with a positive electrode collector, a positive electrode mix layer containing positive electrode active substance particles, and an intermediate layer disposed between the positive electrode collector and positive electrode mix layer. The intermediate layer contains a conductor and a cured product of a curable resin having at least one selected from a glycidyl, hydroxy, carboxyl, amino, acryloyl, and methacryloyl groups.
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公开(公告)号：US20200020951A1
公开(公告)日：2020-01-16
申请号：US16582347
申请日：2019-09-25
Inventor： Daisuke Furusawa , Tomoki Shiozaki , Hideharu Takezawa , Takahito Nakayama , Yuji Oura , Takahiro Takahashi
IPC: H01M4/62 , H01M4/131 , H01M4/66 , H01M10/0525 , H01M10/0587
Abstract: According to the present invention, a positive electrode is provided with: a positive electrode current collector which contains aluminum; a positive electrode mixture layer which contains a positive electrode active material that is configured of a lithium transition metal oxide; and an intermediate layer which is arranged between the positive electrode current collector and the positive electrode mixture layer. The intermediate layer contains inorganic compound particles, a conductive material and a binder; the circularity is from 5% to 75% (inclusive); the void fraction of the intermediate layer is from 30% to 69% (inclusive); and the average circularity of the inorganic compound particles is from 5% to 75% (inclusive).
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公开(公告)号：US11527757B2
公开(公告)日：2022-12-13
申请号：US16580195
申请日：2019-09-24
Inventor： Takahito Nakayama , Tomoki Shiozaki , Hideharu Takezawa , Daisuke Furusawa , Yuji Oura , Takahiro Takahashi
Abstract: A positive electrode used in a secondary cell that is an example of the present embodiment is provided with a positive electrode collector, an intermediate layer formed on the positive electrode collector, and a positive electrode mixture layer formed on the intermediate layer. The positive electrode mixture layer has a thermally expandable material and a positive electrode active material. The thermally expandable material content of the positive electrode mixture layer is at least 0.1% by mass and less than 5% by mass. The intermediate layer has an insulating inorganic material and a conductive agent. The insulating inorganic material content of the intermediate layer is 80-99% by mass.
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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：US20220115671A1
公开(公告)日：2022-04-14
申请号：US17426851
申请日：2019-12-12
Inventor： Yuko Ogawa , Hideharu Takezawa , Yuji Oura
IPC: H01M4/66
Abstract: This positive electrode is characterized by comprising a positive electrode collector, a positive electrode mixture layer that contains a lithium-containing transition metal oxide, and a protective layer that is arranged between the positive electrode collector and the positive electrode mixture layer, and is also characterized in that: the protective layer contains an inorganic compound that has a lower oxidative power than the lithium-containing transition metal oxide; a part of the lithium-containing transition metal oxide penetrates through the protective layer so as to be in contact with the positive electrode collector; and the coverage α of the main surface of the positive electrode collector by the protective layer is 50% or more.
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Patent Agency Ranking
公开(公告)号：US20200152990A1
公开(公告)日：2020-05-14
申请号：US16744574
申请日：2020-01-16
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 provided on the surface of the positive electrode collector having the recesses and projections; and a positive electrode mixture layer provided on the intermediate layer and contains a positive electrode active material. This positive electrode being 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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公开(公告)号：US20200020921A1
公开(公告)日：2020-01-16
申请号：US16582312
申请日：2019-09-25
Inventor： Tomoki Shiozaki , Daisuke Furusawa , Yuji Oura , Takahiro Takahashi , Takahito Nakayama , Hideharu Takezawa
IPC: H01M2/26 , H01M4/131 , H01M10/0587 , H01M10/0525 , H01M4/62
Abstract: According to the present invention, a positive electrode is provided with: a positive electrode current collector; a positive electrode active material layer which contains a positive electrode active material that is configured from a lithium transition metal oxide; a protective layer which is arranged between the positive electrode current collector and the positive electrode active material layer; and a positive electrode tab which is bonded with the positive electrode current collector at a positive electrode tab bonding part where the positive electrode active material layer and the protective layer are not formed so that the positive electrode current collector is exposed. An end edge of the positive electrode active material layer facing the positive electrode tab and an end edge of the protective layer facing the positive electrode tab are arranged in different positions in the longitudinal direction of the positive electrode.
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18.发明申请公开(公告)号：US20200006778A1
公开(公告)日：2020-01-02
申请号：US16568826
申请日：2019-09-12
Inventor： Kazuki Endo , Tomoki Shiozaki , Yuji Oura
IPC: H01M4/66 , H01M4/131 , H01M4/62 , H01M4/485 , H01M10/0525
Abstract: A positive electrode is provided with: a positive electrode current collector constituted of aluminum as the main component; a positive electrode mixture layer formed on the positive electrode current collector aid containing a lithium-containing transition metal oxide; and a protective layer interposed between the positive electrode current collector and the positive electrode mixture layer. The protective layer contains inorganic particles, a conductive agent, and a binder material. In the positive electrode, the peel strength between the positive electrode current collector and the protective layer is higher than the peel strength between the protective layer and the positive electrode mixture layer.
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公开(公告)号：US20190157650A1
公开(公告)日：2019-05-23
申请号：US16253494
申请日：2019-01-22
Inventor： Yuji Oura , Takahiro Takahashi , Tomoki Shiozaki , Hajime Nishino
Abstract: According to the present invention, a positive electrode of a lithium secondary battery is provided with an insulating tape that covers an electrode tab on an exposed part. This insulating tape has a multilayer structure that is composed of an organic material layer, a composite material layer which is formed from an organic material and an inorganic material, and an adhesive layer. The inorganic material in the composite material layer accounts for 20% or more of the weight of the composite material layer; and the inorganic material contains at least one substance selected from the group consisting of metal oxides, metal nitrides, metal fluorides and metal carbides. Puncture strength is ensured by means of the organic material layer, while heat resistance is ensured by means of the composite material layer.
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公开(公告)号：US20250105251A1
公开(公告)日：2025-03-27
申请号：US18973507
申请日：2024-12-09
Inventor： Yuji Oura , Yuki Tokuda
IPC: H01M4/13 , H01M4/36 , H01M4/48 , H01M4/62 , H01M10/0525
Abstract: In the present invention, this positive electrode is provided with: a collector; and a composite material layer that is formed on at least one surface of the collector. The composite material layer includes a particulate aggregate formed from inorganic substance particles which do not occlude or emit Li, a conductive material, and a binding material for binding the inorganic particles and the conductive material. According to an exemplary embodiment, the aggregate is present closer to the collector side at least with respect to the thickness-direction center of the composite material layer, and accounts for at least 1.3 vol % with respect to the volume of the composite material layer.
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