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.

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：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.