公开(公告)号：US20250105295A1

公开(公告)日：2025-03-27

申请号：US18974849

申请日：2024-12-10

Applicant: TDK Corporation

Inventor： Hiroshi SASAGAWA ,  Takashi MORI

IPC: H01M4/62 ,  H01M4/02 ,  H01M4/13 ,  H01M4/134 ,  H01M4/36 ,  H01M4/38 ,  H01M4/48 ,  H01M10/0525

Abstract: This negative electrode active material layer may contain a negative electrode active material and a fibrous material. The negative electrode active material may contain silicon. The fibrous material may contain at least one kind selected from the group consisting of titanium oxide, potassium titanate, aluminum oxide, silicon carbide, silicon nitride, and silicon oxide. The fiber length of the fibrous material may be 20 μm or more and 150 μm or less. The value obtained by dividing a thickness of the negative electrode active material layer by the fiber length may be 0.4 or more and 1.0 or less.

公开(公告)号：US20210083316A1

公开(公告)日：2021-03-18

申请号：US16633558

申请日：2018-12-25

Applicant: TDK CORPORATION

Inventor： Hiroshi SASAGAWA ,  Yasuyuki KAWANAKA

IPC: H01M10/056 ,  H01M10/0587

Abstract: The secondary cell with the nonaqueous electrolyte includes: the wound body in which an electrode group including the positive electrode, the negative electrode, and a separator sandwiched therebetween is wound in a flat shape; and the nonaqueous electrolyte having the wound body immersed therein. The wound body, in the central section within at least five layers from the inside of the wound body, includes a gap between adjacent layers of the electrode group and a length Gn of the gap in a major axis direction of the wound body when viewed from the axial direction of the wound body fulfills a relationship of 0.09/n−0.003≤Gn≤0.98/n−0.093 (1≤n≤4).

公开(公告)号：US20250087677A1

公开(公告)日：2025-03-13

申请号：US18956068

申请日：2024-11-22

Applicant: TDK Corporation

Inventor： Hiroshi SASAGAWA ,  Takashi MORI

IPC: H01M4/38 ,  H01M4/02 ,  H01M4/134 ,  H01M4/62 ,  H01M10/0525

Abstract: This negative electrode active material layer may contain a negative electrode active material and acicular particles. The negative electrode active material may contain silicon. The acicular particles may contain at least one kind selected from the group consisting of titanium oxide, potassium titanate, aluminum oxide, silicon carbide, silicon nitride, and silicon oxide, The length of the minor axis of each of the acicular particles may be 0.1 μm or more and 0.5 μm or less. The aspect ratio of each of the acicular particles may be 1.2 or more and 15.0 or less.

公开(公告)号：US20220311004A1

公开(公告)日：2022-09-29

申请号：US17699626

申请日：2022-03-21

Applicant: TDK CORPORATION

Inventor： Hiroshi SASAGAWA ,  Yuji YAMAMOTO ,  Kazuki MATSUSHITA ,  Takashi MORI

IPC: H01M4/62 ,  H01M10/0525 ,  H01M4/134 ,  C08F216/06 ,  C08F220/12

Abstract: The negative electrode for a lithium ion secondary battery includes: a current collector; and a negative electrode active material layer which is in contact with at least one surface of the current collector, the negative electrode active material layer has a negative electrode active material and a binder, the negative electrode active material contains a material that can be alloyed with Li, the binder contains a predetermined copolymer, and a specific surface area of a surface of the negative electrode active material layer on a side opposite to the current collector side is 7.0 m2/g or more and 16.0 m2/g or less.

公开(公告)号：US20180269468A1

公开(公告)日：2018-09-20

申请号：US15915371

申请日：2018-03-08

Applicant: TDK CORPORATION

Inventor： Hiroshi SASAGAWA ,  Yasuyuki KAWANAKA ,  Takuya AOKI

IPC: H01M4/133 ,  H01M10/0525 ,  H01M4/38

CPC classification number: H01M4/133 ,  H01M4/38 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/0585 ,  H01M2004/027

Abstract: A negative electrode of a lithium ion secondary battery of the present invention includes a current collector (32) and a negative electrode active material layer (34) provided on the current collector (32). In the negative electrode of a lithium ion secondary battery, the negative electrode active material layer (34) includes carbon particles, a degree of graphitization of the carbon particles is 1.0 or more and 1.5 or less and a degree of orientation of the carbon particles is 50 or more and 150 or less; where, the degree of graphitization is a ratio (P101/P100) between a peak intensity P101 of the (101) plane and a peak intensity P100 of the (100) plane in an X-ray diffraction pattern and the degree of orientation is a ratio (P002/P110) between a peak intensity P002 of the (002) plane and a peak intensity P110 of the (110) plane in an X-ray diffraction pattern.