CATHODE ACTIVE MATERIAL, PREPARATION METHOD THEREFOR, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

Title:

CATHODE ACTIVE MATERIAL, PREPARATION METHOD THEREFOR, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

Document Type and Number:

WIPO Patent Application WO/2021/125869

Kind Code:

A1

Abstract:

The present embodiments relate to a cathode active material, a preparation method therefor, and a lithium secondary battery comprising same. An embodiment can provide a cathode active material comprising a lithium metal oxide particle and a coating layer disposed on the surface of the lithium metal oxide particle and having a c value of 1.25 or higher as analyzed for W4f by XPS, the c value being represented by formula 1 below: [Formula 1] c=b/a. In formula 1, a is a strength value of W4f 5/2 as measured by XPS and b is a strength value of specific W4f 7/2 as measured by XPS.

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Inventors:

CHOI KWON YOUNG (KR)
NAM SANG CHEOL (KR)
LEE SANG HYUK (KR)
PARK INCHUL (KR)
PARK JONG IL (KR)
SONG JUNG HOON (KR)
KWON OHMIN (KR)

Application Number:

PCT/KR2020/018640

Publication Date:

June 24, 2021

Filing Date:

December 18, 2020

Export Citation:

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Assignee:

POSCO (KR)
RES INST IND SCIENCE & TECH (KR)

International Classes:

H01M4/36; C01G41/00; C01G53/00; H01M4/505; H01M4/525; H01M4/62; H01M10/052

Foreign References:

KR20190078100A	2019-07-04
KR20190088786A	2019-07-29
KR20180137597A	2018-12-27
KR20180084727A	2018-07-25

Other References:

BECKER DINA, BÖRNER MARKUS, NÖLLE ROMAN, DIEHL MARCEL, KLEIN SVEN, RODEHORST UTA, SCHMUCH RICHARD, WINTER MARTIN, PLACKE TOBIAS: "Surface Modification of Ni-Rich LiNi0.8Co0.1Mn0.1O2 Cathode Material by Tungsten Oxide Coating for Improved Electrochemical Performance in Lithium-Ion Batteries", APPLIED MATERIALS & INTERFACES, vol. 11, no. 20, 22 May 2019 (2019-05-22), US, pages 18404 - 18414, XP055822117, ISSN: 1944-8244, DOI: 10.1021/acsami.9b02889

Attorney, Agent or Firm:

YOU ME PATENT AND LAW FIRM (KR)

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