Role of V2O5 coating on LiNiO2-based materials for lithium ion battery

X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive spectrometer (EDX) and X-ray photoelectron spectroscopy (XPS) are used to demonstrate that V2O5 is successfully coated on LiNiO2-based materials. The V2O5 layer will react with Li impurities on surface, which will red...

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Bibliographic Details
Published inJournal of power sources Vol. 245; pp. 183 - 193
Main Authors Xiong, Xunhui, Wang, Zhixing, Yan, Guochun, Guo, Huajun, Li, Xinhai
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier 01.01.2014
Subjects
Applied sciences
Corrosion inhibitors
Cycles
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrolytes
Exact sciences and technology
Impurities
Inhibition
Lithium-ion batteries
Materials
Vanadium pentoxide
X-ray photoelectron spectroscopy
X-rays
Ternary compound
Lithium ion batteries
Electrochemical performance
Coating material
Storage characteristic
Nickel Oxides
Lithium Oxides
Secondary cell
Coatings
Electrochemical characteristic
Lithium ion battery
Lithium nickel oxide-based materials
Storage
Vanadium V Oxides
Vanadium oxide
Lithium oxide
Nickel oxide
Electrical characteristic
Vanadium pentoxide coating
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Summary:X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive spectrometer (EDX) and X-ray photoelectron spectroscopy (XPS) are used to demonstrate that V2O5 is successfully coated on LiNiO2-based materials. The V2O5 layer will react with Li impurities on surface, which will reduce the pH value and rapid moisture uptake ability of LiNiO2-based materials. Cells tests indicate that V2O5-coating layer works as HF inhibitor and/or HF scavenger, which contributes a significant improvement in cycling performance and storage characteristics in electrolyte. In the mean time, V2O5 acts as isolating layer when cathode material contacts with electrolyte especially cycling at high voltage. Structural analysis shows that V2O5-coating layer has more advantage over other oxide coating in delaying Ni3+/Ni2+ transformation and lithium extraction from bulk surface, which benefits from the properties of V2O5 reacting with LiOH/Li2CO3 impurities on surface.
Bibliography:ObjectType-Article-1
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ISSN:0378-7753
DOI:10.1016/j.jpowsour.2013.06.133