公开(公告)号：US20240120560A1

公开(公告)日：2024-04-11

申请号：US18272945

申请日：2022-01-19

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Takashi Tsukasaki ,  Yuto Horiuchi

IPC: H01M10/44 ,  H01M4/36 ,  H01M4/48 ,  H01M4/587 ,  H01M10/48 ,  H02J7/00

CPC classification number: H01M10/44 ,  H01M4/364 ,  H01M4/483 ,  H01M4/587 ,  H01M10/48 ,  H02J7/0048 ,  H02J7/00712 ,  H01M2004/027

Abstract: A charging method for a non-aqueous electrolyte secondary battery according to one aspect of the present disclosure comprises a switching step for switching the control temperature of a non-aqueous electrolyte secondary battery from high temperature to low temperature, wherein the non-aqueous electrolyte secondary battery includes a positive electrode and a negative electrode which reversibly perform intercalation and deintercalation of lithium ions, and the negative electrode contains, as a negative electrode active material, a carbon material and a silicon compound. The timing of the switching step is determined by detecting that dQGr/dQ, that is, the ratio of the amount of change in a capacity QGr of the carbon material to the amount of change in a battery capacity Q, becomes larger than dQSi/dQ, that is, the ratio of the amount of change in a capacity QSi of the silicon compound to the amount of change in the battery capacity Q.

公开(公告)号：US20240396015A1

公开(公告)日：2024-11-28

申请号：US18692502

申请日：2022-08-22

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Takashi Tsukasaki ,  Yosuke Sato

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/38 ,  H01M4/583 ,  H01M4/62 ,  H01M4/66 ,  H01M10/0525

Abstract: Provided is a high-capacity, long-life lithium-ion secondary battery. A lithium ion secondary battery that is an example of an embodiment comprises a positive electrode, a negative electrode, a separator that separates the positive electrode and the negative electrode from each other, and an electrolyte, wherein the negative electrode has a negative electrode collector and a negative electrode mixture layer formed on the surface of the negative electrode collector, the negative electrode mixture layer includes a negative electrode active material having a discharge capacity of 400-750 mAh/g and a conductive agent, the negative electrode active material includes a carbon-based material and a silicon-based material, the negative electrode current collector has a thickness of 4-12 μm, the negative electrode current collector has a 1% yield strength of 300-700 MPa, and the conductive agent includes carbon nanotubes.

公开(公告)号：US20240113344A1

公开(公告)日：2024-04-04

申请号：US18273423

申请日：2022-01-24

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Takashi Tsukasaki

IPC: H01M10/44 ,  H01M4/36 ,  H01M4/48 ,  H01M4/583 ,  H02J7/00

CPC classification number: H01M10/44 ,  H01M4/364 ,  H01M4/483 ,  H01M4/583 ,  H02J7/00712 ,  H01M2004/027

Abstract: The present invention provides a method for charging a nonaqueous electrolyte secondary battery which is provided with a negative electrode containing a carbon material, the method enabling charging with high efficiency, while ensuring good cycle characteristics. A method for charging a nonaqueous electrolyte secondary battery according to one embodiment of the present disclosure is a charging method for a nonaqueous electrolyte secondary battery that is provided with a negative electrode which contains a carbon material as a negative electrode active material; and this method comprises a switching step wherein the control temperature of the nonaqueous electrolyte secondary battery is switched from a high temperature to a low temperature.