公开(公告)号：US20230378448A1

公开(公告)日：2023-11-23

申请号：US18028368

申请日：2021-09-09

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Tatsuro Sasa ,  Yuta Kuroda

IPC: H01M4/38 ,  H01M4/583 ,  H01M4/36 ,  H01M4/134 ,  H01M10/0525

CPC classification number: H01M4/386 ,  H01M4/583 ,  H01M4/364 ,  H01M4/134 ,  H01M10/0525 ,  H01M2004/027

Abstract: This negative electrode for secondary batteries is provided with a negative electrode mixture layer which comprises a binder material and a negative electrode active material that contains graphite particles and an Si-containing material; the Si-containing material contains an Si-containing material A which comprises a carbon phase and silicon particles that are dispersed in the carbon phase; in cases where the negative electrode mixture layer is divided into equal halves in the thickness direction, the average intraparticle void fraction of the graphite particles contained in the upper half region is 13% or less, and is smaller than the average intraparticle void fraction of the graphite particles contained in the lower half region.

公开(公告)号：US20230343932A1

公开(公告)日：2023-10-26

申请号：US18028015

申请日：2021-09-09

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuta Kuroda ,  Tatsuro Sasa

IPC: H01M4/36 ,  H01M4/587 ,  H01M4/38 ,  H01M4/485

CPC classification number: H01M4/364 ,  H01M4/587 ,  H01M4/386 ,  H01M4/485 ,  H01M2004/027

Abstract: This negative electrode for a secondary battery comprises a negative electrode mixture layer that includes: a negative electrode active material containing graphite particles and a Si-containing material; and a binder. The Si-containing material includes a Si-containing material A that includes a carbon phase and silicon particles dispersed in the carbon phase. The graphite particles include graphite particles A with 5% or less particle internal porosity, and the content of the graphite particles A is at least 10% by mass with respect to the total mass of the negative electrode active material. The content of the Si-containing material A is at least 1% by mass with respect to the total mass of the negative electrode active material.

公开(公告)号：US20230290939A1

公开(公告)日：2023-09-14

申请号：US18032431

申请日：2021-10-29

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuji Goshima ,  Yuta Kuroda ,  Fumiharu Niina ,  Tatsuro Sasa

IPC: H01M4/38 ,  H01M4/134

CPC classification number: H01M4/386 ,  H01M4/134

Abstract: A nonaqueous electrolyte secondary battery according to one embodiment of the present disclosure is provided with a positive electrode, a negative electrode and a nonaqueous electrolyte, while being characterized in that: the negative electrode comprises a negative electrode active material that contains an Si-containing material; the Si-containing material contains a first Si-containing material which comprises a silicate phase and silicon particles that are dispersed in the silicate phase, and a second Si-containing material which comprises a carbon phase and silicon particles that are dispersed in the carbon phase; and the difference between the initial charge/discharge efficiency (Efc) of the positive electrode and the initial charge/discharge efficiency (Efa) of the negative electrode, namely (Efc−Efa) satisfies 1%