Selective TiO2 Nanolayer Coating by Polydopamine Modification for Highly Stable Ni-Rich Layered Oxides

Title
Selective TiO2 Nanolayer Coating by Polydopamine Modification for Highly Stable Ni-Rich Layered Oxides
Authors
김형석김형우장지혜변동진최원창
Keywords
cathode materials; lithium-ion batteries; Ni-rich layered oxides; polydopamine; surface modification
Issue Date
2019-12
Publisher
ChemSusChem
Citation
VOL 12, NO 24-5264
Abstract
Ni-rich layered oxides are promising cathode materials for developing high-energy lithium-ion batteries. To overcome the major challenge of surface degradation, a TiO2 surface coating based on polydopamine (PDA) modification was investigated in this study. The PDA precoating layer had abundant OH catechol groups, which attracted Ti(OEt)4 molecules in ethanol solvent and contributed towards obtaining a uniform TiO2 nanolayer after calcination. Owing to the uniform coating of the TiO2 nanolayer, TiO2-coated PDA-LiNi0.6Co0.2Mn0.2O2 (TiO2-PNCM) displayed an excellent electrochemical stability during cycling under high voltage (3.0– 4.5 V vs. Li+/Li), during which the cathode material undergoes a highly oxidative charge process. In addition, TiO2-PNCM exhibited excellent cyclability at elevated temperature (60 8C) compared with the bare NCM. The surface degradation of the Ni-rich cathode material, which is accelerated under harsh cycling conditions, was effectively suppressed after the formation of an ultra-thin TiO2 coating layer.
URI
http://pubs.kist.re.kr/handle/201004/70773
ISSN
1864-5631
Appears in Collections:
KIST Publication > Article
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