Versatile Coating of Lithium Conductive Li sub(2)TiF sub(6) on Over-lithiated Layered Oxide in Lithium-Ion Batteries

We demonstrate an easy and versatile approach to modify a cathode-surface with a highly lithium-ion conductive layer by coating it with Li sub(2)TiF sub(6). The thin and homogeneous Li sub(2)TiF sub(6) coating is introduced onto an over-lithiated layered oxide (OLO, namely Lii sub(17)Ni sub(0.17)Co...

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Bibliographic Details
Published in:Electrochimica acta 2014-01, Vol.117, p.492-497
Main Authors: Choi, Wonchang, Benayard, Anass, Park, Jin-Hwan, Park, Junho, Doo, Seok-Gwang, Mun, Junyoung
Format: Article
Language:English
Subjects:
Coating
Coprecipitation
Diffraction
Interface reactions
Lithium
Lithium batteries
Lithium-ion batteries
Oxides
Thermal stability
X-rays
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Summary:We demonstrate an easy and versatile approach to modify a cathode-surface with a highly lithium-ion conductive layer by coating it with Li sub(2)TiF sub(6). The thin and homogeneous Li sub(2)TiF sub(6) coating is introduced onto an over-lithiated layered oxide (OLO, namely Lii sub(17)Ni sub(0.17)Co sub( 0.1)Mn sub(0.55)O sub(2)) surface via simple co-precipitation at ambient temperature by using Li sub(2)CO sub(2) and H sub(2)TiF sub(6) aqueous solutions. The lithium-conductive fluoride coating is expected to effectively suppress the undesired electrochemical and thermal mterfacial reactions involving the OLO, which is critical in improving cycle performance and thermal stability. After Li sub(2)TiF sub(6) surface modification, the coated OLO materials showed high rate capability as well as long cyclability and improved thermal stability. The crystalline structure and surface microstructure of the prepared OLOs were investigated by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. Ultimately, the performances of the assembled lithium ion batteries were thoroughly investigated by electrochemical methods and thermal analysis.
ISSN:0013-4686
DOI:10.1016/j.electacta.2013.11.184