公开(公告)号：US20230411619A1

公开(公告)日：2023-12-21

申请号：US18207817

申请日：2023-06-09

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Masayuki KIMURA ,  Kenji ARAI ,  Taisuke NAKAO ,  Kazutaka KURIKI

IPC: H01M4/583 ,  H01M10/0525 ,  H01M4/38 ,  H01M4/36 ,  H01M4/04

CPC classification number: H01M4/583 ,  H01M10/0525 ,  H01M4/386 ,  H01M4/364 ,  H01M4/04 ,  H01M2004/027

Abstract: A negative electrode active material, a negative electrode active material layer, and a secondary battery including them, or a formation method thereof are provided. In one embodiment of the present invention, carbon particles and a silicon-based material are mixed and used as a negative electrode active material. A polymer including a polar substituent such as a carboxy group is used as a binder. Specifically, as the binder for the carbon particles and the silicon-based material, a polymer containing glutamic acid is used. As the silicon-based material, nanosilicon particles each having a particle diameter less than 1 μm is used.

公开(公告)号：US20240413324A1

公开(公告)日：2024-12-12

申请号：US18703508

申请日：2022-10-14

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Seiya SAITO ,  Tetsuya KAKEHATA ,  Kazutaka KURIKI ,  Taisuke NAKAO ,  Kenji ARAI

IPC: H01M4/525 ,  H01M4/02 ,  H01M10/0525 ,  H01M10/0569

Abstract: A lithium ion battery having excellent discharge characteristics even at a temperature below freezing is provided. The lithium ion battery includes a positive electrode containing a positive electrode active material, an electrolyte solution, and a negative electrode containing a negative electrode active material that is a carbon material; the carbon material has peaks at 2θ of greater than or equal to 20° and less than or equal to 24°, 2θ of greater than or equal to 42° and less than or equal to 46.5°, and 2θ of greater than or equal to 78° and less than or equal to 82° in X-ray diffraction (XRD) analysis; and a value of the discharge capacity obtained by subjecting the lithium ion battery to constant current and constant voltage charging (0.1 C, 4.5 V, and a termination current of 0.01 C) at 25° C. and then discharging at −40° C. is higher than or equal to 40% of a value of the discharge capacity in discharging at 25° C.

公开(公告)号：US20240006599A1

公开(公告)日：2024-01-04

申请号：US18342457

申请日：2023-06-27

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kenji ARAI ,  Taisuke NAKAO

IPC: H01M4/38 ,  H01M4/62 ,  H01M10/0569 ,  H01M4/134

CPC classification number: H01M4/386 ,  H01M4/622 ,  H01M10/0569 ,  H01M4/134 ,  H01M2300/0028 ,  H01M2004/027

Abstract: A novel secondary battery that is highly convenient, useful, or reliable can be provided. The secondary battery includes a positive electrode active material layer, a negative electrode active material layer, and a separator. The separator is interposed between the positive electrode active material layer and the negative electrode active material layer. The negative electrode active material layer includes silicon particles and a binder. The weight ratio of the binder to the silicon particles is greater than or equal to 0.05 and less than or equal to 10. The binder has a carboxy group. The bulk specific gravity of the silicon particles is greater than or equal to 0.02 g/cm3 and less than or equal to 0.5 g/cm3.