Study of lithium diffusion in RF sputtered Nickel–Vanadium mixed oxides thin films

Artuso, Florinda; Bonino, F.; Decker, F.; Lourenço, Airton; Masetti, Enrico

doi:10.1016/s0013-4686(02)00061-0

Cited by 25 publications

(14 citation statements)

References 16 publications

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“…15 As will be discussed the next section ex situ AFM measurements confirmed that after repeated long cycle operation the electrodes become more extensively covered by a surface film: the nature of this surface layer has been investigated further by XPS measurements.…”

Section: Ni-v Transparent Oxide Films 819mentioning

confidence: 74%

“…and non-aqueous lithium salt solutions. 8,15,20 They also suggested a model for fitting the EIS spectra, including a Randles circuit in series with a Voigt-type analogue (several elements in series, constituted by a resistance and a capacitance in parallel) and reflecting the Li ion migration through the multilayer surface films. Z' (Ohm) Figure 3.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

“…The performance and lifetime of such thin-film oxides have been studied recently by means of several electrochemical techniques 15 and was among the best recorded so far for this kind of film electrode: after 1000 cycles the fading of the charge capacity was less than 0.01%, when the inserted charge was still as large as 44 mC cm 2 . Nevertheless, the evolution of the film impedance, increasing with the number of charge-discharge cycles, was a matter of concern because it is an indication of a kinetic barrier growing up in time.…”

Section: Introductionmentioning

confidence: 99%

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Surface evolution of Ni–V transparent oxide films upon Li insertion reactions

Zanoni

Decker

Coluzza

et al. 2002

Surface & Interface Analysis

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A detailed picture is reported of the nature of an Li insertion Ni-V mixed-oxide electrode and of its evolution upon prolonged intercalation/deintercalation cycles. A combination of bulk and surface-sensitive techniques is used, including electrochemical analysis (cyclic voltammetry, impedance spectroscopy), atomic force microscopy (AFM) and XPS. The Ni-V oxide film, obtained by r.f. sputtering as a thin film on conductive glass for use as a transparent electrode in electrochromic windows, is an Li insertion material with high charge capacity, very good reversibility and a surface morphology characterized by a low initial roughness. Its surface composition shows an initial Ni enrichment. The nominal Ni-V stoichiometry is recovered already after ten cycles. Extended Li charge-discharge cycles induce progressive changes in the electrode reversibility (capacity fading) and in the reaction kinetics (increase of impedance). The surface evolution consists of the progressive accumulation of an Li carbonate layer, with thickness and roughness increasing with the number of cycles. The constancy of the core level and Auger peaks of Ni and V after 100 cycles excludes major changes in the electronic structure of the host oxide. However, electrochemical and AFM experiments performed after 1000 cycles indicate that the carbonate deposition on the electrode progresses further, therefore the surface layer is unable to yield a permanent electrode passivation and stabilization.

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Section: Ni-v Transparent Oxide Films 819mentioning

confidence: 74%

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface evolution of Ni–V transparent oxide films upon Li insertion reactions

Zanoni

Decker

Coluzza

et al. 2002

Surface & Interface Analysis

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“…Its charge capacity is appropriate to serve as ion-storage film, but other electrochromic characteristics are suboptimal. To improve these deficiencies mixed oxides of several elements (W, Mo, Ti, Ce, Cu, Ni, Cr, Nb) with V 2 O 5 were studied [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Crnjak Orel et al [13] reported on the preparation of aqueous sols from V 2 O 5 and Ce(NH 4 ) 2 (NO 3 ) 6 . Opara Krašovec et al [12] prepared Ce/ V sols from CeCl 3 Á 7H 2 O and citric acid in a proportion 1:2 then added V-oxoisopropoxide in various ratios and dissolved the mixture in ethanol.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical, optical and X-ray absorption studies of Ce/V mixed oxides thin films

Škofic¹,

Gomilšek

Kodre

et al. 2010

Solar Energy Materials and Solar Cells

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a b s t r a c tCe/V mixed oxide thin films with molar ratio 1 were prepared by sol-gel method from CeCl 3 Á 7H 2 O and NH 4 VO 3 with methanol or distilled water as a solvent and dip-coated on SnO 2 /F-covered glass. The electrochemical, optical and structural properties of thin films depend on the solvent and heat treatment. The ion-storage capacities of the films annealed at 500 1C, prepared from methanol, 60 nm thick, was approximately 13 mC cm À 2 and those prepared with distilled water, 40 nm thick, more than 20 mC cm . X-ray absorption fine structure analysis showed that crystallization process of CeVO 4 occurs in temperature range between 400 and 500 1C.

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2018

Impedance Spectroscopy

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Study of lithium diffusion in RF sputtered Nickel–Vanadium mixed oxides thin films

Cited by 25 publications

References 16 publications

Surface evolution of Ni–V transparent oxide films upon Li insertion reactions

Surface evolution of Ni–V transparent oxide films upon Li insertion reactions

Electrochemical, optical and X-ray absorption studies of Ce/V mixed oxides thin films

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