公开(公告)号：US20230317957A1

公开(公告)日：2023-10-05

申请号：US18022661

申请日：2021-08-23

Applicant: GS Yuasa International Ltd.

Inventor： Norio YAMATANI ,  Morito TANABE ,  Takeshi SASAKI

IPC: H01M4/62 ,  H01M50/538 ,  H01M4/587

CPC classification number: H01M4/625 ,  H01M50/538 ,  H01M4/587 ,  H01M2004/027

Abstract: One aspect of the present invention is an energy storage device satisfying the following formula 1, in which a flat electrode assembly obtained by winding a positive electrode and a negative electrode with a separator interposed therebetween and having two curved surface portions facing each other, and a case that houses the electrode assembly, and at least one of the positive electrode and the negative electrode includes an active material layer containing active material particles and a fibrous conductive agent. In the formula 1, X is a distance from a distal end of one of the curved surface portions to the inner surface of the case facing the distal end of the curved surface portion as viewed in the winding axis direction of the electrode assembly. R is a length of a periphery of the one curved surface portion as viewed in the winding axis direction of the electrode assembly. D is an average particle size D50 of the active material particles. A is a surface roughness Ra of the active material layer.


(R/D)A≥2X  1

公开(公告)号：US20240266499A1

公开(公告)日：2024-08-08

申请号：US18568022

申请日：2022-03-29

Applicant: GS Yuasa International Ltd.

Inventor： Norio YAMATANI ,  Morito TANABE ,  Yuki ASADA

IPC: H01M4/133 ,  H01M4/02

CPC classification number: H01M4/133 ,  H01M2004/021 ,  H01M2004/027

Abstract: An energy storage device according to an aspect of the present invention includes an electrode assembly including a negative electrode and a positive electrode, the negative electrode includes a negative active material layer including a negative active material, the negative active material contains solid graphite, the negative active material layer has a BET specific surface area of 2.1 m2/g or less, and a pressure applied to the electrode assembly is 0.1 MPa or more.

公开(公告)号：US20230207784A1

公开(公告)日：2023-06-29

申请号：US17928121

申请日：2021-05-20

Applicant: GS Yuasa International Ltd.

Inventor： Kohei TSUJITA ,  Morito TANABE ,  Norio YAMATANI

IPC: H01M4/36 ,  H01M4/131 ,  H01M4/66

CPC classification number: H01M4/366 ,  H01M4/131 ,  H01M4/663 ,  H01M2004/028

Abstract: One aspect of the present invention is a positive electrode for an energy storage device including a positive active material layer, in which the positive active material layer includes a positive active material particle having a ratio of a secondary particle size to a primary particle size of 3 or less, and a fibrous conductive agent.

公开(公告)号：US20230155180A1

公开(公告)日：2023-05-18

申请号：US17915128

申请日：2021-03-24

Applicant: GS Yuasa International Ltd.

Inventor： Norio YAMATANI

IPC: H01M10/0585 ,  H01M4/525 ,  H01M4/30

CPC classification number: H01M10/0585 ,  H01M4/525 ,  H01M4/30 ,  H01M2004/028

Abstract: An energy storage device according to one aspect of the present invention includes: an electrode assembly including a positive electrode, a negative electrode, and a separator; a nonaqueous electrolyte; and a case for housing the electrode assembly and the nonaqueous electrolyte, in which the positive electrode contains a positive active material, the positive active material contains a plurality of particles satisfying at least one of conditions (1) and (2) below, and the electrode assembly is in a pressed state. (1) A plurality of primary particles that do not form secondary particles (2) A plurality of secondary particles formed by aggregation of a plurality of primary particles, having a ratio of an average diameter of the secondary particles to an average diameter of the primary particles that form the secondary particles of less than 11

公开(公告)号：US20230087788A1

公开(公告)日：2023-03-23

申请号：US17797987

申请日：2021-02-16

Applicant: GS Yuasa International Ltd.

Inventor： Norio YAMATANI

IPC: H01M4/62 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0567 ,  H01M4/131 ,  H01M10/058 ,  H01G11/86 ,  H01G11/64 ,  H01G11/46

Abstract: An aspect of the present invention is a nonaqueous electrolyte energy storage device including: a positive electrode including a positive composite layer containing a transition metal oxide and a boron element; a negative electrode; and a nonaqueous electrolyte containing a sulfate compound, in which the content of the boron element in the positive composite layer is 0.03% by mass or more.