Title:
METHOD FOR ACTIVATING ELECTROCHEMICAL PROPERTY OF CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY AND CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2021/246830
Kind Code:
A1
Abstract:
The present invention relates to a method for obtaining a cathode active material having both high capacity and high stability reversibly by improving electrochemical properties of a lithium-rich metal oxide. The method according to the present invention comprises: a delithiation step of partially delithiating a Li-rich metal oxide represented by the following [chemical formula 1] and having a layered structure to form a plurality of Li vacancies in the crystal structure of the Li-rich metal oxide; and a thermal treatment step of thermally treating the delithiated Li-rich metal oxide to make a distribution of M' and/or M elements constituting the Li-rich metal oxide through diffusion. [chemical formula 1] a{Li2M'O3}·(1-a){LiMO2} or Li1+x(M'M)1-xO2 (0
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Inventors:
KANG BYOUNG-WOO (KR)
LEE JUNG-HWA (KR)
LEE JUNG-HWA (KR)
Application Number:
PCT/KR2021/007044
Publication Date:
December 09, 2021
Filing Date:
June 04, 2021
Export Citation:
Assignee:
POSTECH RES & BUSINESS DEV FOUND (KR)
International Classes:
H01M4/1391; H01M4/04; H01M4/505; H01M4/525; H01M10/052; H01M10/44
Foreign References:
| KR20150015412A | 2015-02-10 | |||
| KR20140073953A | 2014-06-17 |
Other References:
LIU YANG, ZHUO HAOXIANG, YIN YANPING, LU SHIGANG, WANG ZHENYAO, ZHUANG WEIDONG: "Remaining Li-Content Dependent Structural Evolution during High Temperature Re-Heat Treatment of Quantitatively Delithiated Li-Rich Cathode Materials with Surface Defect-Spinel Phase", APPLIED MATERIALS & INTERFACES, AMERICAN CHEMICAL SOCIETY, US, vol. 12, no. 24, 17 June 2020 (2020-06-17), US , pages 27226 - 27240, XP055877775, ISSN: 1944-8244, DOI: 10.1021/acsami.0c05756
WANG RUI, HE XIAOQING, HE LUNHUA, WANG FANGWEI, XIAO RUIJUAN, GU LIN, LI HONG, CHEN LIQUAN: "Atomic Structure of Li2MnO3 after Partial Delithiation and Re-Lithiation", ADVANCED ENERGY MATERIALS, WILEY - V C H VERLAG GMBH & CO. KGAA, DE, vol. 3, no. 10, 1 October 2013 (2013-10-01), DE , pages 1358 - 1367, XP055877773, ISSN: 1614-6832, DOI: 10.1002/aenm.201200842
SARKAR TANMAY, PRAKASHA K. R., BHARADWAJ MRIDULA DIXIT, PRAKASH A. S.: "Li-Removal Mechanism and Its Effect on Oxygen Stability Influencing the Electrochemical Performance of Li 1.17 Ni 0.17 Mn 0.67 O 2 : Experimental and First-Principles Analysis", THE JOURNAL OF PHYSICAL CHEMISTRY C, AMERICAN CHEMICAL SOCIETY, US, vol. 121, no. 38, 28 September 2017 (2017-09-28), US , pages 20591 - 20596, XP055877772, ISSN: 1932-7447, DOI: 10.1021/acs.jpcc.7b05662
WANG RUI, HE XIAOQING, HE LUNHUA, WANG FANGWEI, XIAO RUIJUAN, GU LIN, LI HONG, CHEN LIQUAN: "Atomic Structure of Li2MnO3 after Partial Delithiation and Re-Lithiation", ADVANCED ENERGY MATERIALS, WILEY - V C H VERLAG GMBH & CO. KGAA, DE, vol. 3, no. 10, 1 October 2013 (2013-10-01), DE , pages 1358 - 1367, XP055877773, ISSN: 1614-6832, DOI: 10.1002/aenm.201200842
SARKAR TANMAY, PRAKASHA K. R., BHARADWAJ MRIDULA DIXIT, PRAKASH A. S.: "Li-Removal Mechanism and Its Effect on Oxygen Stability Influencing the Electrochemical Performance of Li 1.17 Ni 0.17 Mn 0.67 O 2 : Experimental and First-Principles Analysis", THE JOURNAL OF PHYSICAL CHEMISTRY C, AMERICAN CHEMICAL SOCIETY, US, vol. 121, no. 38, 28 September 2017 (2017-09-28), US , pages 20591 - 20596, XP055877772, ISSN: 1932-7447, DOI: 10.1021/acs.jpcc.7b05662
Attorney, Agent or Firm:
IAM PATENT FIRM (KR)
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