IR spectroscopy of crystalline V2O5 films in different stages of lithiation

Šurca, Angelja Kjara; Orel, B.

doi:10.1016/s0013-4686(99)00019-5

Cited by 88 publications

(41 citation statements)

References 27 publications

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“…The sample showed an electrochemically active region between 1.5 and 3.5 V. Two well-distinguished cathodic peaks appear, whereas during the positive scan the oxidation peaks were less separated. Because the positions of these peaks are quite similar to those of V 2 O 5 reported in the literature, 16 it could be supposed that only vanadium participates in the redox reaction and nickel is not electrochemically active during the intercalation/deintercalation process. This was confirmed by XPS analysis, which showed no evidence of nickel reduction due to lithium insertion.…”

Section: Cyclic Voltammetrysupporting

confidence: 77%

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: Cyclic Voltammetrysupporting

confidence: 77%

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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show abstract

“…Vanadium oxide has been prepared by a variety of methods, including evaporation [15,[20][21][22], d.c. sputtering [23], r.f. sputtering [24][25][26], pulsed laser deposition [27], plasmaenhanced chemical vapor deposition [28,29], electrochemical deposition [30][31][32] and sol-gel [33][34][35][36][37][38][39][40][41][42] preparations. However, the electrochromic performance of a-V 2 O 5 − z films deposited on Films were characterized to give insight into the nature of the coatings: the films' surfaces were studied by X-ray photoelectron spectroscopy (XPS) and field emitted scanning electron microscopy (FESEM).…”

Section: Introductionmentioning

confidence: 99%

Electrochromic properties of V2O5−z thin films sputtered onto flexible PET/ITO substrates

2008

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“…A number of researchers have shown that vibrational spectroscopy is very useful in probing fundamental lithium intercalation reactions in a variety of crystalline electrode materials [33][34][35][36][37][38][39][40][41][42]. For example, the LiFePO 4 -FePO 4 phase change could be easily identified in Li x FePO 4 (0 ≤ x ≤ 1) cathodes using vibrational spectroscopy [42].…”

Section: Introductionmentioning

confidence: 99%