公开(公告)号：US20210057710A1

公开(公告)日：2021-02-25

申请号：US17049412

申请日：2019-02-19

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Masanobu Takeuchi ,  Manabu Takijiri ,  Yoshio Kato ,  Masahiro Shiraga

IPC: H01M2/26 ,  H01M10/0587 ,  H01M2/02 ,  H01M10/0567 ,  H01M4/587 ,  H01M4/133 ,  H01M10/0525

Abstract: A nonaqueous electrolyte secondary battery (10) according to one embodiment of the present disclosure is provided with: an electrode body (14) which is obtained by winding a positive electrode (30) and a negative electrode (40), with a separator (50) being interposed therebetween; a nonaqueous electrolyte; and a battery case (15) which is formed of a metal and contains the electrode body (14) and the nonaqueous electrolyte. The negative electrode (40) comprises a negative electrode collector (41) and a negative electrode active material layer (42) that contains graphite particles as a negative electrode active material; the outer circumferential surface of the electrode body (14) is provided with an exposure part (43) from which the negative electrode collector (41) is exposed so as to be in contact with the inner circumferential surface of the battery case (15); and the graphite particles have a compressive strength of 15 MPa or more.

公开(公告)号：US11923543B2

公开(公告)日：2024-03-05

申请号：US17049384

申请日：2019-02-22

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yoshio Kato ,  Yoshinori Kida ,  Masahiro Shiraga

IPC: H01M4/583 ,  H01M4/02

CPC classification number: H01M4/583 ,  H01M2004/027 ,  H01M2004/028

Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present invention includes a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein the negative electrode contains, as a negative electrode active material, graphite particles having a volume per mass, of pores having a diameter of 2 nm or less determined by the DFT method from nitrogen adsorption isotherm, of 0.3 mm3/g or less.

公开(公告)号：US20210249658A1

公开(公告)日：2021-08-12

申请号：US17049384

申请日：2019-02-22

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yoshio Kato ,  Yoshinori Kida ,  Masahiro Shiraga

IPC: H01M4/583

Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present invention includes a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein the negative electrode contains, as a negative electrode active material, graphite particles having a volume per mass, of pores having a diameter of 2 nm or less determined by the DFT method from nitrogen adsorption isotherm, of 0.3 mm3/g or less.

公开(公告)号：US20240405192A1

公开(公告)日：2024-12-05

申请号：US18696472

申请日：2022-09-27

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Rina Yamamoto ,  Youichirou Uka ,  Yoshio Kato

IPC: H01M4/131 ,  H01M4/02 ,  H01M4/36 ,  H01M4/525

Abstract: A positive electrode for a secondary battery including a positive electrode current collector, and a positive electrode mixture layer containing a positive electrode active material and disposed on a surface of the positive electrode current collector in which the positive electrode mixture layer contains a first positive electrode active material having a compressive strength of 400 MPa or less, a second positive electrode active material having a compressive strength smaller than the compressive strength of the first positive electrode active material, and when the positive electrode mixture layer is zoned into a first region and a second region having the same thickness, the first positive electrode active material is contained more in the first region than in the second region, and the second positive electrode active material is contained more in the second region than in the first region is used.

公开(公告)号：US20240396000A1

公开(公告)日：2024-11-28

申请号：US18697323

申请日：2022-09-27

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Youichirou Uka ,  Rina Yamamoto ,  Yoshio Kato

IPC: H01M4/04 ,  H01M4/02 ,  H01M4/36 ,  H01M4/62 ,  H01M10/052

Abstract: A positive electrode for a secondary battery including a positive electrode current collector, and a positive electrode mixture layer containing a positive electrode active material and disposed on a surface of the positive electrode current collector, in which the positive electrode mixture layer contains a first positive electrode active material, a second positive electrode active material crushable more easily than the first positive electrode active material, and when the positive electrode mixture layer is zoned into a first region and a second region having the same thickness, the first positive electrode active material is contained more in the first region than in the second region, and the second positive electrode active material is contained more in the second region than in the first region is used. The crack ratio of the positive electrode active material in the first region is smaller than that in the second region.