In-situ XAS study on Li2MnSiO4 and Li2FeSiO4 cathode materials

Dominko, Robert; Arčon, Iztok; Kodre, Alojz; Hanžel, D.; Gaberšček, Miran

doi:10.1016/j.jpowsour.2008.11.077

Cited by 125 publications

(103 citation statements)

References 26 publications

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“…The presence of impurity phases like MnO and less amount of Li 2 SiO 3 are unavoidable during the synthesis process. A similar kind of impurity phases are noticed by the researchers during the synthesis of Li 2 MnSiO 4 powders by various approaches [5][6][7][8][9][10]. Abnormal pressure conditions provides the MnO and Li 2 SiO 3 free Li 2 MnSiO 4 phase.…”

Section: Resultssupporting

confidence: 60%

A novel approach to employ Li2MnSiO4 as anode active material for lithium batteries

Aravindan

Karthikeyan

Pandian

et al. 2010

Ionics

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In the present paper, we describe utilization of cathode active material as anode active material, for example, Li 2 MnSiO 4 . The lithium manganese silicate has been successfully synthesized by solid-state reaction method. The X-ray diffraction pattern confirms the orthorhombic structure with Pmn2 1 space group. The Li/Li 2 MnSiO 4 cell delivered the initial discharge capacity of 420 mAhg −1 , which is 110 mAhg −1 higher than graphitic anodes. The electrochemical reversibility and solid electrolyte interface formation of the Li 2 MnSiO 4 electrode was emphasized by cyclic voltammetry.

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Section: Resultssupporting

confidence: 60%

A novel approach to employ Li2MnSiO4 as anode active material for lithium batteries

Aravindan

Karthikeyan

Pandian

et al. 2010

Ionics

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“…If the sample contains the same cation in two or more sites with different local structure and valence state, the measured XANES spectrum M a n u s c r i p t 10 is a linear combination of individual XANES spectra of the different cation sites. In such cases the relative amounts of the cation at each site can be precisely determined by the linear combination fit [8,25]. The procedure is applied to V XANES spectra measured during the charge/discharge process.…”

Section: X-ray Absorption Spectroscopymentioning

confidence: 99%

Electrochemical characteristics of Li2−VTiO4 rock salt phase in Li-ion batteries

Dominko

Garrido

Bele

et al. 2011

Journal of Power Sources

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Li 2-x VTiO 4 /C sample with a disordered rock salt structure was successfully prepared by annealing at a temperature of 850°C. The electrochemical oxidation in the first cycle occurs at voltages above 4 V versus metallic lithium, while the shapes of the electrochemical curves in consequent reduction -oxidation processes show a monotonous change of the potential between the selected cut-off voltages. A linear combination fit of individual XANES spectra was used for the determination of the oxidation states of as prepared sample and intermediate states during oxidation and reduction. In the as-prepared sample, vanadium was found to be in the average oxidation state of V 3.5+ and was additionally oxidized to V 3.8+ by the electrochemical charging. During the discharge process, the vanadium oxidation state was reduced to V 3.0+ . In-situ X-ray diffraction patterns and EXAFS analysis suggest good structural stability during oxidation and reduction, which is also reflected in the cycling stability if batteries were cycled in the voltage window between 2.0 V and 4.4 V. Extension of

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“…For certain methods this can be achieved with relative ease due to the large similarities in design of their respective in situ cells. Examples of such combinations are: Raman and FTIR [64], XRD and XAS [21], XAS and MS [19], and neutron diffraction together with neutron scattering [106]. Given the recent progress it can be expected that in situ research will become increasingly important in the development of future generations of Li-ion batteries.…”

Section: Discussionmentioning

confidence: 99%

“…To allow better penetration of the X-rays, carbon paper can be used as current collector instead of metal foils [17]. Standard pouch [18] and coffee bag [19] batteries can be employed without modification as the high energy photons that are applied for XAS are able to penetrate the entire battery stack. Furthermore the X-ray energy is tuned to the absorption edge of the element of interest and therefore absorption by other elements present in the battery components can be minimalized [20].…”

Section: X-ray Absorption Spectroscopymentioning

confidence: 99%