公开(公告)号：US20240405215A1

公开(公告)日：2024-12-05

申请号：US18731052

申请日：2024-05-31

Applicant: NICHIA CORPORATION

Inventor： Toru KOIZUKA ,  Shinya HAMAGUCHI ,  Yasuhiro YOSHIDA ,  Naohiro IKEDA

IPC: H01M4/525 ,  C01G53/00 ,  H01M4/02

Abstract: A positive active material for a lithium ion battery has a layered structure and contains nickel atoms and cobalt atoms. The positive active material has a ratio of a number of moles of the nickel atom to a total number of moles of metal atoms other than lithium that is 0.7 or more and less than 1. The positive active material has a disorder of lithium element determined by an X-ray diffraction method that is 6.2% or less.

公开(公告)号：US20220255064A1

公开(公告)日：2022-08-11

申请号：US17589852

申请日：2022-01-31

Applicant: NICHIA CORPORATION

Inventor： Kenta KAWAI ,  Yoshiteru MIYAMOTO ,  Taiga SHIRAISHI ,  Yasuhiro YOSHIDA ,  Masahiro MURAYAMA ,  Tomoya MATSUI

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/505 ,  H01M10/0525 ,  C01G53/00

Abstract: The positive electrode active material includes secondary particles formed by aggregation of a plurality of primary particles that contain a lithium transition metal composite oxide having a layered structure and containing lithium and nickel. The secondary particles have a smoothness greater than 0.73, and a circularity greater than 0.83. The secondary particles contain cobalt and have a first region at a depth of 150 nm from a surface of the respective secondary particle and a second region at a depth of 10 nm or less from the surface of the respective secondary particle, and a ratio of a number of moles of cobalt to a total number of moles of metal elements other than lithium in the second region is larger than a ratio of a number of moles of cobalt to a total number of moles of metal elements other than lithium in the first region.

公开(公告)号：US20220259066A1

公开(公告)日：2022-08-18

申请号：US17631317

申请日：2020-07-30

Applicant: NICHIA CORPORATION

Inventor： Yoshiteru MIYAMOTO ,  Taiga SHIRAISHI ,  Kenta KAWAI ,  Yasuhiro YOSHIDA ,  Masahiro MURAYAMA

IPC: C01G53/00 ,  H01M10/0525

Abstract: Provided is a positive electrode for an all-solid-state lithium ion secondary battery which can reduce the internal resistance of the all-solid-state lithium ion secondary battery. The positive electrode includes an active material layer containing a positive electrode active material and a solid electrolyte material. The positive electrode active material contains secondary particles comprising an aggregate of a plurality of primary particles containing a lithium transition metal composite oxide. A smoothness of the secondary particles is more than 0.73, and a degree of circularity of the secondary particles is more than 0.83.