Title:
POSITIVE ELECTRODE ACTIVE MATERIAL, FOR LITHIUM SECONDARY BATTERY, COMPRISING LITHIUM TETRAMETHYLSILYL BORATE COATING LAYER AND PREPARATION METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2020/101173
Kind Code:
A1
Abstract:
The present invention relates to a positive electrode active material, for a lithium secondary battery, comprising a lithium tetramethylsilyl borate (LTB) coating layer and a preparation method thereof and, more particularly, to a positive electrode active material, for a lithium secondary battery, comprising: a core comprising a lithium composite transition metal oxide; and a lithium tetramethylsilyl borate coating layer on the surface of the core. A positive electrode active material according to the present invention enables a nanoscale-based artificial CEI layer to be formed on a Ni-rich NCM positive electrode surface by means of a chemical reaction between a Ni-rich NCM positive electrode material and an LTB even at room temperature. An LTB layer formed on the surface enhances the surface stability of the Ni-rich NCM positive electrode and enhances the electrochemical performance of a cell using the LTB-coated Ni-rich NCM positive electrode. A method for preparing a positive electrode active material according to the present invention is simpler and more efficient than a common coating method which requires temperature exceeding a three-digit temperature value (°C) in order to coat the surface of a Ni-rich NCM positive electrode with an inorganic material.
Inventors:
YIM TAE EUN (KR)
JANG SEOL HEUI (KR)
JANG SEOL HEUI (KR)
Application Number:
PCT/KR2019/012768
Publication Date:
May 22, 2020
Filing Date:
September 30, 2019
Export Citation:
Assignee:
INU RES & BUSINESS FOUNDATION (KR)
International Classes:
H01M4/36; C01G53/00; C07F7/08; H01M4/1391; H01M4/505; H01M4/525; H01M4/62; H01M10/052
Foreign References:
| KR20170143373A | 2017-12-29 | |||
| KR20160075196A | 2016-06-29 |
Other References:
JANG, S. H. ET AL.: "Chemically-induced cathode-electrolyte interphase created by lithium salt coating on Nickel-rich layered oxides cathode", JOURNAL OF POWER SOURCES 2019, vol. 410-411, 9 November 2018 (2018-11-09), pages 15 - 24
YAN, C. ET AL.: "Tiis(trimethylsilyl) borate as an electrolyte additive for high-voltage lithium-ion batteries using LiNi1/3Mn1/3Co1/302 cathode", JOURNAL OF ENERGY CHEMISTRY, vol. 25, 2015, pages 659 - 666
ZHANG, J. ET AL.: "Artificial Interface Deriving from Sanifirial Tris(trimethylsilyl)phosphate Additive for Lithium Rich Cathode Materials", ELECTROCHIMICA ACTA, vol. 117, 2014, pages 99 - 104, XP028611887, DOI: 10.1016/j.electacta.2013.11.024
YAN, C. ET AL.: "Tiis(trimethylsilyl) borate as an electrolyte additive for high-voltage lithium-ion batteries using LiNi1/3Mn1/3Co1/302 cathode", JOURNAL OF ENERGY CHEMISTRY, vol. 25, 2015, pages 659 - 666
ZHANG, J. ET AL.: "Artificial Interface Deriving from Sanifirial Tris(trimethylsilyl)phosphate Additive for Lithium Rich Cathode Materials", ELECTROCHIMICA ACTA, vol. 117, 2014, pages 99 - 104, XP028611887, DOI: 10.1016/j.electacta.2013.11.024
Attorney, Agent or Firm:
CHA, Joon Yong (KR)
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