公开(公告)号：US20230343942A1

公开(公告)日：2023-10-26

申请号：US18028011

申请日：2021-09-14

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Norihisa Yamamoto ,  Masahiro Soga

IPC: H01M4/38 ,  H01M4/62 ,  H01M4/134

CPC classification number: H01M4/386 ,  H01M4/625 ,  H01M4/622 ,  H01M4/134 ,  H01M2004/027

Abstract: This negative electrode for a secondary battery is provided with a negative electrode mixture layer comprising an Si compound-containing negative electrode active material, a conductive material and a binding material; the conductive material includes single-layer carbon nanotubes with a outermost diameter of at most 5 nm, and the binding material contains carboxymethyl cellulose salt with a weight average molecular weight of 150,000-450,000.

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.

公开(公告)号：US20220302451A1

公开(公告)日：2022-09-22

申请号：US17639118

申请日：2020-07-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Masahiro Soga ,  Masaki Hasegawa ,  Takahiro Fukuoka

IPC: H01M4/587 ,  H01M10/0525 ,  H01M4/62 ,  H01M4/36 ,  H01M4/48

Abstract: A negative electrode for a secondary battery including a negative electrode active material capable of absorbing and releasing lithium ions. The negative electrode active material includes a first carbon material as a main component, and includes a second carbon material and a silicon-containing material which are present between particles of the first carbon material. The first carbon material has an average particle diameter A, the second carbon material has an average particle diameter B, and the silicon-containing material has an average particle diameter C, satisfying A>C≥B.

公开(公告)号：US20250158037A1

公开(公告)日：2025-05-15

申请号：US18839127

申请日：2023-02-14

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Masato Otsuka ,  Masahiro Soga

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/38 ,  H01M10/04

Abstract: A secondary battery electrode according to one embodiment of the present invention comprises an electric current collector and active material layers formed on the electric current collector. The active material layers each include a first active material layer formed on the electric current collector, and a second active material layer formed on the electric current collector with the first active material layer interposed therebetween. As compared to the first active material layer, the second active material layer has a lower curvature rate or a larger porosity, or the contained amount of a binder therein is 0.5 times or more. The second active material layer has a plurality of grooves on the surface thereof.

公开(公告)号：US20240405219A1

公开(公告)日：2024-12-05

申请号：US18694115

申请日：2022-09-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Norihisa Yamamoto ,  Masahiro Soga ,  Naomichi Sato

IPC: H01M4/583 ,  H01M4/02 ,  H01M4/10 ,  H01M4/36 ,  H01M4/38 ,  H01M4/525 ,  H01M10/052

Abstract: An electrode for secondary batteries according to one embodiment of the present invention is provided with a core body and a mixture layer that is formed on the core body. The mixture layer comprises a first mixture layer and a second mixture layer that is arranged on the first mixture layer. The tortuosity (τ2) of the second mixture layer is lower than the tortuosity (τ1) of the first mixture layer. The ratio (τ2/τ1) of the tortuosity (τ2) to the tortuosity (τ1) satisfies, for example, 0.3≤(τ2/τ1)

公开(公告)号：US11949091B2

公开(公告)日：2024-04-02

申请号：US16975820

申请日：2019-01-25

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Masahiro Soga ,  Taisuke Yamamoto

IPC: H01M4/133 ,  H01M4/02 ,  H01M4/131 ,  H01M4/134 ,  H01M10/0525 ,  H01M10/44 ,  H01M10/48

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.

公开(公告)号：US20230361307A1

公开(公告)日：2023-11-09

申请号：US18028700

申请日：2021-09-15

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Norihisa Yamamoto ,  Masahiro Soga ,  Takashi Watanabe

IPC: H01M4/62 ,  H01M4/38 ,  H01M4/134

CPC classification number: H01M4/625 ,  H01M4/386 ,  H01M4/622 ,  H01M4/134 ,  H01M2004/021

Abstract: A secondary battery negative electrode according to the present invention is provided with a negative electrode mixture layer comprising: a negative electrode active material that contains an Si compound; and a binding material that includes cellulose nanofibers having a fiber diameter of 9 nm or less and a conductive material containing single-walled carbon nanotubes having a fiber diameter of less than 4 nm. The content of the cellulose nanofibers is greater than or equal to 0.005 mass % and less than 0.2 mass % in relation to the mass of the negative electrode active material.

公开(公告)号：US20230317950A1

公开(公告)日：2023-10-05

申请号：US18011254

申请日：2021-06-24

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Norihisa Yamamoto ,  Nobuhiko Hojo ,  Masahiro Soga

IPC: H01M10/0568 ,  H01M4/134 ,  H01M10/052 ,  H01M4/38 ,  H01M4/62

CPC classification number: H01M4/622 ,  H01M4/134 ,  H01M4/386 ,  H01M4/625 ,  H01M10/052 ,  H01M10/0568 ,  H01M2004/027

Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode mixture including a negative electrode active material capable of electrochemically absorbing and releasing lithium ions, carbon nanotubes, and a binder. The negative electrode active material includes a silicon-containing material, and the binder includes an acrylic polymer. The polymer includes a hydrophilic structural unit having a carboxyl group, and a hydrophobic structural unit.

公开(公告)号：US20220190320A1

公开(公告)日：2022-06-16

申请号：US17441961

申请日：2020-02-17

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Takahiro Fukuoka ,  Masaki Hasegawa ,  Masahiro Soga ,  Yuto Horiuchi ,  Takashi Yamamoto

IPC: H01M4/36 ,  H01M4/62 ,  H01M4/134 ,  H01M4/38 ,  H01M10/0525

Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode material mixture including a negative electrode active material capable of electrochemically absorbing and desorbing lithium ions, a carbon nanotube; and an acrylic resin. The negative electrode active material includes a composite material including a silicate phase, and silicon particles dispersed in the silicate phase, and the silicate phase includes at least one selected from the group consisting of alkali metal elements and Group 2 elements.