Lithium complex oxide for lithium secondary battery positive active material and method of preparing the same

Patent metadata

Field	Value
Publication number	US-2024379956-A1
Application number	US-202418735371-A
Country	US
Kind code	A1
Filing date	Jun 6, 2024
Priority date	Aug 2, 2016
Publication date	Nov 14, 2024
Grant date	—

Abstract

A lithium complex oxide and method of manufacturing the same, more particularly, a lithium complex oxide effective in improving the characteristics of capacity, resistance, and lifetime with reduced residual lithium and with different interplanar distances of crystalline structure between a primary particle locating in an internal part of secondary particle and a primary particle locating on the surface part of the secondary particle, and a method of preparing the same.

First claim

1 . A lithium complex oxide secondary particle formed by coagulation of a plurality of primary particles,
wherein the secondary particle comprises a Co-coating layer on the surface, wherein the secondary particle has at least one peak at positions (104), (110), (113), (101), (102), and (003) during XRD analysis, and wherein the secondary particle has a ratio between the highest peak intensity (I 289 ) between 288 eV and 290 eV and a highest peak intensity (I 284 ) between 283.5 eV and 285.5 eV during a C 1s core-level spectrometry that is obtained through XPS measurement, and wherein the ratio is I 289 /I 284 ≤0.9.

2 . The lithium complex oxide secondary particle of claim 1 , wherein an interplanar distance of the crystalline structure in said primary particles at the center of the secondary particle, d1, is configured to be equal to or larger than 4.8 nm.

3 . The lithium complex oxide secondary particle of claim 1 , wherein an interplanar distance of the crystalline structure in said primary particles on the surface of the secondary particle, d2, is configured to be equal to or smaller than 4.7 nm.

4 . The lithium complex oxide secondary particle of claim 1 , wherein the lithium complex oxide secondary particle is configured in a hexagonal structure, and
wherein a lithium ion pathway in said primary particles is formed toward the center from the surface of the secondary particle.

5 . The lithium complex oxide secondary particle of claim 1 , wherein the secondary particle has a bound energy (P1) of spin-orbit splitting 2p3/2 peak and a bound energy (P2) of 2p1/2 peak in a Co 2p core-level spectrometry obtained through XPS measurement, and
wherein the P1 and the P2 are ranged respectively in 779 eV≤P1≤780 eV and 794 eV≤P2≤795 eV.

6 . The lithium complex oxide secondary particle of claim 1 , wherein the secondary particle has a ratio of highest peak intensity (I 531 ) between 530 eV and 532 eV and a highest peak intensity (I 528 ) between 527.5 eV and 529.5 eV during an O 1s core-level spectrometry that is obtained through XPS measurement, and wherein the ratio is I 531 / 1 528 ≤2.

7 . (canceled)

8 . The lithium complex oxide secondary particle of claim 1 , wherein the secondary particle is given by the following Formula 1
Li X1 Ni 1−(x1+y1+z1+r1) Co x1 M1 y1 M2 z1 M3 r1 O a ,  [Formula 1]

wherein, in the Formula 1, M1 is Mn or Al, and M2 is Co, and M3 is selected from the group consisting of Al, Ba, B, Co, Ce, Cr, F, Li, Mg, Mn, Mo, P, Sr, Ti, and Zr, and
wherein 0.95≤X1≤1.05, 1.50≤a≤2.1, 0.02≤x1≤0.25, 0.01≤y1≤0.20, 0≤z1≤0.20, and 0≤r1≤0.20.

9 . A method of preparing a lithium complex oxide secondary particle of claim 1 comprising:
manufacturing precursors of lithium secondary battery positive active material;
reacting the precursors of lithium secondary battery positive active material with a lithium compound and manufacturing a positive active material by a first thermal treatment;
washing the positive active material with distilled water or an alkaline solution;
reactively coating the washed positive active material with a solution containing Co with distilled water or an alkaline solution;
drying particles of the positive active material; and
mixing the dried positive active material with one or more elements selected from the group consisting of Al, Ba, B, Co, Ce, Cr, F, Mg, Mn, Mo, P, Sr, Ti, and Zr and doping the one or more elements into the particles by a second thermal treatment.

10 . A lithium secondary battery comprising a lithium complex oxide secondary particle of claim 1 .

11 . (canceled)

Assignees

• Ecopro Bm Co Ltd

Inventors

• Choi Moon Ho
• Shin Jong Seung
• Kim Dong Hee
• Jeon Suk Yong
• Yu Hyun Jong
• Lee Kyoung Jun
• Park Young Nam

Classifications

• C01G53/82 Primary

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• C01P2006/40

  Electric properties · CPC title