公开(公告)号：US20230112744A1

公开(公告)日：2023-04-13

申请号：US17913739

申请日：2022-01-07

Applicant: TDK CORPORATION

Inventor： Tomohiko HASEGAWA ,  Kosuke SATO ,  Hiroki KARISYUKU ,  Takashi MORI

IPC: H01M4/62 ,  H01M4/525 ,  H01M10/0525 ,  C01G49/00

Abstract: A lithium iron complex oxide is represented by Li5FeO4, two peaks with different quadrupole splitting values (QS) analyzed using 57Fe Mössbauer spectroscopy are shown, one of the two peaks, a peak A, satisfies QS>0, and the other one of the two peaks, a peak B, satisfies QS=0.

公开(公告)号：US20230102390A1

公开(公告)日：2023-03-30

申请号：US17903069

申请日：2022-09-06

Applicant: TDK Corporation

Inventor： Kazuki MATSUSHITA ,  Yuji YAMAMOTO ,  Takashi MORI

IPC: H01M10/0567 ,  H01M10/0569 ,  H01M10/0568

Abstract: This non-aqueous electrolyte may include: a compound represented by Chemical Formula (1). wherein a repeating number n of a unit structure may be an integer in a range of 1 to 7, inclusive.

公开(公告)号：US20220311007A1

公开(公告)日：2022-09-29

申请号：US17699881

申请日：2022-03-21

Applicant: TDK CORPORATION

Inventor： Hiroki KARISYUKU ,  Takashi MORI ,  Yasuhide YAMASHITA ,  Kotaro TERAO

IPC: H01M4/62 ,  H01M4/131 ,  H01M10/0525

Abstract: A positive electrode for a lithium ion secondary battery includes a current collector and a positive electrode active material layer in contact with at least one surface of the current collector, wherein the positive electrode active material layer contains a plurality of positive electrode active materials and a plurality of fibrous carbons, the positive electrode active material layer has a plurality of pores therein, at least a part of the plurality of fibrous carbons is intertwined with each other to form a carbon network, and the carbon network is formed on a surface facing one of the plurality of pores.

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：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：US20230080975A1

公开(公告)日：2023-03-16

申请号：US17898565

申请日：2022-08-30

Applicant: TDK Corporation

Inventor： Takashi MORI

IPC: H01M4/62 ,  H01M4/38 ,  H01M10/0568 ,  H01M10/0569 ,  H01M4/48 ,  H01M4/587 ,  H01M10/0525

Abstract: A lithium-ion secondary battery containing: a positive electrode; a negative electrode; a separator between the positive electrode and the negative electrode; and an electrolyte, in which the negative electrode may contain silicon or a silicon compound, a binder, and a carbon nanotube, the binder may contain a compound having a structure in which a linear molecule penetrates a cyclic molecule, and the electrolyte may contain an electrolytic salt containing one or more elements selected from the group consisting of boron, carbon, nitrogen, oxygen, and sulfur.

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：US20220311008A1

公开(公告)日：2022-09-29

申请号：US17703345

申请日：2022-03-24

Applicant: TDK CORPORATION

Inventor： Tomohiko HASEGAWA ,  Kosuke SATO ,  Hiroki KARISYUKU ,  Tomohide SHIRANE ,  Takashi MORI

IPC: H01M4/62 ,  H01M4/131 ,  H01M4/525 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/485

Abstract: The lithium ion secondary battery includes: a positive electrode; a negative electrode; a separator disposed between the positive electrode and the negative electrode; and an electrolytic solution, in which the positive electrode has a metal foil and a positive electrode active material layer provided on the metal foil, a plurality of voids are formed on the positive electrode active material layer, and a transition metal oxide having an average particle size of 10 nm or more and 500 nm or less is provided on an inner wall portion of the voids, on which the voids and the electrolytic solution are in contact with each other.