Changes in the resistance of electrolyte solutions during contact with lithium electrodes at open circuit potential that reflect the Li surface chemistry

Aurbach, Doron; Schechter, Alex

doi:10.1016/s0013-4686(01)00428-5

Cited by 32 publications

(22 citation statements)

References 14 publications

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“…29,30 It seems that the amount of lithium carbonate adsorbed on the film surface increases in the order, film 2 > film 1 > film 3, at 3.0 V and is dependent on the applied potential, increasing, for the two studied cases, when the electrochemical process takes place at 2.3 V (Tables 1-3, Fig. 8).…”

Section: Surface Characterization Of the De-intercalated Filmsmentioning

confidence: 86%

“…This last finding taken together with the results of multi-cycled film 1 may indicate a surface reconstruction (formation and dissolution of adsorbed layers with time) with a possible role played by the ageing of the solvent. 29,30,33 Figure 10. SEM pictures at high resolution of film 1 after nearly 700 cycles with magnification of some degraded small particles on the edges.…”

Section: Investigation On Ito/glassmentioning

confidence: 99%

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XPS study of the Li intercalation process in sol-gel-produced V2O5 thin film: influence of substrate and film synthesis modification

Ibriş

Salvi

Liberatore

et al. 2005

Surf. Interface Anal.

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We report on the process of lithium intercalation in V 2 O 5 thin films deposited onto standard ITO-coated glass substrates. The films were deposited via a well-established sol-gel route, and the samples were examined as working electrodes in a range of potentials versus lithium reference electrode. This paper follows up issues arising from parallel spectroscopic characterizations of the films by X-ray photoelectron spectroscopy (XPS). Specifically, the XPS examination showed that not all of the Li-ion charge inserted was accounted for by the V(5) to V(4) reduction, but the stoichiometric balance could be maintained only by considering additional oxygens arising from the intercalation procedure, leading to Li 2 O formation. In this work, we have examined the possibility that the source of oxygen is the ITO substrate. To this purpose, films of V 2 O 5 deposited on silicon substrates have been prepared using the sol-gel process and examined by XPS after electrochemical intercalation/de-intercalation cycles. We show that in this case a perfect balance between electrochemical charge, inserted Li and reduced vanadium is obtained. A further indication of ITO-substrate effects was obtained from examination, by the same methods, of some unconventional V 2 O 5 films that had been co-precipitated with a siloxane, designed to provide a template structure. The results obtained from this material imply that a barrier layer is formed at the ITO interface and, therefore, the formation of Li 2 O is avoided. The results are discussed in terms of the possible degradation of conventional V 2 O 5 on ITO as a result of electrochemically induced interface reactions.

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Section: Surface Characterization Of the De-intercalated Filmsmentioning

confidence: 86%

Section: Investigation On Ito/glassmentioning

confidence: 99%

XPS study of the Li intercalation process in sol-gel-produced V2O5 thin film: influence of substrate and film synthesis modification

Ibriş

Salvi

Liberatore

et al. 2005

Surf. Interface Anal.

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“…7. The peaks around 1641, 1080, and 871 cm −1 represent the C=O bond of ROCO 2 Li, the C-O bond of ROLi, and the CO 3 2− bond of Li 2 CO 3 , respectively [11][12][13]. The main peak between 1400 and 1500 cm −1 is the C-O bond of Li 2 CO 3 [11].…”

Section: Ftir Analysismentioning

confidence: 98%

Effects of KPF6 on the electrochemical performance of natural graphite/Li

Wei

Qin

Zhang

et al. 2015

Ionics

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Lithium hexafluorophosphate (LiPF 6 ) is the best electrolyte for lithium-ion batteries because of its excellent performance. The conversion of KPF 6 into LiPF 6 is a green chemical process. However, KPF 6 residues are introduced into the electrolyte during the preparation process. In this study, we evaluated the effects of KPF 6 on the electrochemical performance of natural graphite/Li. The results of a cycling test showed that as the KPF 6 content increased in the electrolyte, the specific capacity of the graphite electrode also increased gradually. The impedance of a solid electrolyte interphase (SEI) film was decreased by the addition of KPF 6 . Cyclic voltammograms showed that the addition of KPF 6 had no effects on the insertion and extraction reactions of lithium ions on the graphite electrode. Analyses of the graphite electrodes using scanning electron microscopy, X-ray diffraction analysis, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy suggested that the addition of 0.09 and 0.2 wt% KPF 6 did not change the main components of the SEI film, but the ROCO 2 Li content decreased and the Li 2 CO 3 content increased. Therefore, the electrochemical performance of the graphite electrode was improved by lithiumion migration on the SEI film, which protected the graphite layer.

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“…The minor changes in solution resistance are attributed to the complicated chemistry of lithium in electrolyte solutions, which leads to slight changes in the content of the conducting species in the solution [42,43]. The high-frequency resistance of the cell in Fig.…”

Section: Impedance Studiesmentioning

confidence: 99%

Electrochemical performance of LiCoO2 cathodes by surface modification using lanthanum aluminum garnet

Chen

Cho

et al. 2008

Journal of Power Sources

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Changes in the resistance of electrolyte solutions during contact with lithium electrodes at open circuit potential that reflect the Li surface chemistry

Cited by 32 publications

References 14 publications

XPS study of the Li intercalation process in sol-gel-produced V2O5 thin film: influence of substrate and film synthesis modification

XPS study of the Li intercalation process in sol-gel-produced V2O5 thin film: influence of substrate and film synthesis modification

Effects of KPF6 on the electrochemical performance of natural graphite/Li

Electrochemical performance of LiCoO2 cathodes by surface modification using lanthanum aluminum garnet

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