XPS investigations of TiOySz amorphous thin films used as positive electrode in lithium microbatteries

Lindic, Marie-Hélène; Martínez, Hervé; Benayad, Anas; Pecquenard, Brigitte; Vinatier, Philippe; Levasseur, Alain; Gonbeau, Danielle

doi:10.1016/j.ssi.2005.04.007

Cited by 56 publications

(65 citation statements)

References 14 publications

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“…It is necessary to underline that the presence of such species at upper potentials than those required for a reduction of carbonate solvents could be interpreted either by a process catalyzed in surface (as similar results were obtained for TiO y S z oxysulfide thin films [26]) or by a migration of these species formed at the surface of the negative electrode via the electrolyte which would layout at the positive electrode. Fig.…”

Section: Xpsmentioning

confidence: 83%

Surface film morphology (AFM) and chemical features (XPS) of cycled V2O5 thin films in lithium microbatteries

Fleutot

Martínez

Pecquenard

et al. 2008

Journal of Power Sources

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a b s t r a c tSputtered vanadium pentoxide thin films have been used as positive electrode in lithium microbatteries and extensively studied after cycling over the 31st galvanostatic cycles by two complementary techniques, especially well-adapted for thin films analysis: X-ray photoelectron spectroscopy and atomic force microscopy. This study is mainly focussed on the characterization of the surface film (solid electrolyte interface-type) which is formed during subsequent discharges and charges and especially on its composition and its morphology that are changing during cycling. First, the growth of a surface layer between the positive electrode and the liquid electrolyte has been evidenced upon the discharge as well as its partial dissolution upon the charge. Secondly, the chemical and topographic changes of this interfacial layer at various stages of cycling are discussed in correlation with the evolution of the discharge capacity over cycles.

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Section: Xpsmentioning

confidence: 83%

Surface film morphology (AFM) and chemical features (XPS) of cycled V2O5 thin films in lithium microbatteries

Fleutot

Martínez

Pecquenard

et al. 2008

Journal of Power Sources

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“…These are similar to those observed in S‐doped TiO 2 materials prepared by using thiourea (169.5 eV), which have been assigned to the substitution of S into Ti sites or the oxidation of surface S species. These emissions, thus, demonstrate the successful incorporation of sulfur into the material; however, they do not provide any evidence for the S 2− state (162 eV) expected for TiS 2 . As all syntheses were prepared in the absence of oxygen, this suggests that the samples may have been oxidized during XPS analysis, or that substitution of S into Ti sites occurred over time, as described previously for TiO 2 /thiourea systems .…”

Section: Resultsmentioning

confidence: 53%

Low‐Temperature Synthesis and Electrochemical Properties of Mesoporous Titanium Oxysulfides

et al. 2015

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This paper describes the synthesis and electrochemical properties of mesoporous titanium oxysulfides prepared through the chemical treatment of pristine mesoporous titanium oxide under various synthesis conditions. The materials were doped with sulfur by using hexamethyldisilathiane (HMDST), a strategy that was developed to improve the conductivity of the material, whilst also retaining the porosity and thermal stability. Varying amounts of HMDST and different synthesis temperatures were tested to optimize the surface area and electrochemical performance. Lower temperatures generally yielded materials with superior properties and, even though the conductivity was improved by using higher loading levels of HMDST, it also led to a drop in initial capacity at the highest synthesis temperature of 200 °C (137–41 mAh g−1). The best performing material was, thus, synthesized by using the highest level of HMDST (3.5 mL) at lower heating temperatures (100–150 °C). This set of conditions maximizes the combination of surface area, initial capacity, conductivity, and capacity retention, the latter of which was notably superior to that of the pristine material (81 vs. 35 %), emphasizing the overall success of this doping strategy in improving the electrochemical properties of these otherwise insulating materials.

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“…A possible reason reported is the structural deterioration of c-TiS 3 during cycles in cells with organic liquid electrolytes. 7) To improve the cycle performance, we propose two approaches. One is the use of solid electrolytes.…”

Section: ¹1mentioning

confidence: 99%

“…The possible reason of the irreversible capacity observed is the structural deterioration of TiS 3 crystal reported in the literature. 7) We analyzed the structural changes of c-TiS 3 after cycle tests and will be discussed later. On the other hand, a-TiS 3 showed the reversible capacity of about 556 mAh g ¹1 for the initial charge discharge process.…”

Section: ¹1mentioning

confidence: 99%

Improved electrochemical performance of amorphous TiS<sub>3</sub> electrodes compared to its crystal for all-solid-state rechargeable lithium batteries

Matsuyama

Hayashi

Ozaki

et al. 2016

J. Ceram. Soc. Japan

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Crystalline and amorphous TiS 3 active materials were prepared. The all-solid-state lithium secondary batteries with crystalline and amorphous TiS 3 showed the initial discharge capacity of about 560 mAh g ¹1 , corresponding to the theoretical capacity of TiS 3 . However, the battery using crystalline TiS 3 had an irreversible capacity at the 1st cycle. The battery showed the reversible capacity of about 400 mAh g ¹1 from the 2nd to 10th cycle. On the other hand, irreversible capacities were not observed for 10 cycles in the battery with amorphous TiS 3 . The structural changes of crystalline and amorphous TiS 3 were observed by XRD and HR-TEM during cycling. Crystalline TiS 3 became partially amorphous during the cycling. Amorphous TiS 3 maintained amorphous state for 10 cycles and thus had the better cyclability compared to crystalline TiS 3 .

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XPS investigations of TiOySz amorphous thin films used as positive electrode in lithium microbatteries

Cited by 56 publications

References 14 publications

Surface film morphology (AFM) and chemical features (XPS) of cycled V2O5 thin films in lithium microbatteries

Surface film morphology (AFM) and chemical features (XPS) of cycled V2O5 thin films in lithium microbatteries

Low‐Temperature Synthesis and Electrochemical Properties of Mesoporous Titanium Oxysulfides

Improved electrochemical performance of amorphous TiS<sub>3</sub> electrodes compared to its crystal for all-solid-state rechargeable lithium batteries

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