The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 25, 2025
Filed:
Dec. 02, 2021
Ecopro Bm Co., Ltd., Chungcheongbuk-do, KR;
Moon Ho Choi, Chungcheongbuk-do, KR;
Seung Hyun Choi, Chungcheongbuk-do, KR;
Ra Na Lim, Chungcheongbuk-do, KR;
A Reum Yang, Chungcheongbuk-do, KR;
ECOPRO BM CO., LTD., Chungcheongbuk-Do, KR;
Abstract
A positive electrode active material for a secondary battery comprises a lithium composite oxide represented by chemical formula 1 below and containing a layer-structured lithium excess oxide, wherein the lithium composite oxide comprises a secondary particle; the secondary particle comprises at least one primary particle; the primary particle comprises at least one crystallite; at least any one of the secondary particle, the primary particle, or the crystallite comprises a core and a shell occupying at least a portion of the surface of the core. When the crystal structure of space group C2/m is designated as [C2/m], the crystal structure of space group R-3m is designated as [R-3m], and the ratio of the crystal structure of space group C2/m versus the crystal structure of space group R-3m is designated as [C2/m]/[R-3m], the [C2/m]/[R-3m] of the core differs from that of the shell in the secondary particle: [chemical formula 1] rLiM1O·(1−r)LiM2O.