公开(公告)号：US20230335725A1

公开(公告)日：2023-10-19

申请号：US17796538

申请日：2021-01-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Masaki Hasegawa ,  Shunsuke Nambuya ,  Yuto Horiuchi

IPC: H01M4/38 ,  H01M10/0525 ,  H01M4/36 ,  H01M4/62

CPC classification number: H01M4/386 ,  H01M10/0525 ,  H01M4/364 ,  H01M4/625 ,  H01M2004/027

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 silicon material, a carbon material capable of electrochemically absorbing and releasing lithium ions, and electrically conductive fibers. The silicon material has a lithium-ion conductive phase, and silicon particles dispersed in the lithium-ion conductive phase. When the negative electrode mixture layer is divided into two layers, a first region and a second region, having the same thickness, the first region is nearer to the negative electrode current collector than the second region is, the silicon material is contained more in the second region than in the first region, and the conductive fibers are contained in the second region.

公开(公告)号：US20230035623A1

公开(公告)日：2023-02-02

申请号：US17784463

申请日：2020-12-01

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Chisaki Fujitomo ,  Tasuku Ishiguro ,  Shunsuke Nambuya

IPC: H01M10/0567 ,  H01M10/0568 ,  H01M10/0569 ,  H01M10/0525 ,  H01M4/04 ,  H01M4/36

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein the negative electrode includes a negative electrode current collector, and a negative electrode active material layer supported by the negative electrode current collector and containing a silicon material as a negative electrode active material; when dividing the negative electrode active material layer into two layers of a first region and a second region having the same thickness, the second region is closer to the negative electrode current collector than the first region; the silicon material is contained in the first region more than the second region; and the nonaqueous electrolyte includes at least one additive selected from the group consisting of a sulfite compound and a sulfate compound.

公开(公告)号：US20230216042A1

公开(公告)日：2023-07-06

申请号：US17912714

申请日：2021-03-25

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Shunsuke Nambuya ,  Norihisa Yamamoto ,  Masahiro Soga

IPC: H01M4/485 ,  H01M4/62 ,  H01M4/131

CPC classification number: H01M4/485 ,  H01M4/625 ,  H01M4/131 ,  H01M2004/027

Abstract: This negative electrode for nonaqueous electrolyte secondary batteries is provided with a negative electrode mixture layer that contains a negative electrode active material and carbon nanotubes. The negative electrode active material contains a first negative electrode active material and a second negative electrode active material; the first negative electrode active material and the second negative electrode active material contain lithium silicate phases, each of which contains lithium, silicon and oxygen, and silicon particles that are dispersed in the lithium silicate phases; the molar ratios of oxygen to silicon (O/Si) in the lithium silicate phases are different from each other; the carbon nanotubes have a diameter of from 1 nm to 5 nm; and the ratio of the mass of the first negative electrode active material relative to the total mass of the first negative electrode active material and the second negative electrode active material is 60% or less.