Surface chemistry study of LiCoO2 coated with alumina

Косова, Н. В.; Devyatkina, E. T.; Slobodyuk, A. B.; Каичев, В. В.

doi:10.1016/j.ssi.2008.02.013

Cited by 55 publications

(30 citation statements)

References 9 publications

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“…But considering the present apparatus resolution, a deconvolution with three peaks is suitable. Al 2 O 3 was identified with a peak at 119.5 eV ± 0.3 eV on the Al-2s core level spectra [23]. Deconvolution of Ti-2p core level spectra consisted of a doublet of energy 458.8 ± 0.3 eV (2p 3/2 ) and 464.1 ± 0.3 eV (2p 1/2 ).…”

Section: Xps Analysesmentioning

confidence: 98%

Influence of the Oxygen Partial Pressure on the Oxidation of Inconel 617 Alloy at High Temperature

et al. 2010

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Ni-based superalloy Inconel 617 (IN617) is one of the main candidate structural materials for high temperature components (heat exchanger) of the gascooled fast reactor (GFR), a possible candidate for generation IV nuclear reactor. The material in operating conditions will be exposed to impure He at a temperature of around 850°C. The impurities are expected to be oxidizing (such as O 2 , H 2 O) but since no feedback experience is available for this type of reactor, the level of impurities is completely unknown. Hence, an attempt has been made to understand the influence of oxygen partial pressure on oxide composition and on the oxidation mechanisms of IN617 at 850°C. To achieve this, oxidation tests were performed at 3 different range of partial pressure: 10 -5 , 0.2 and 200 mbar. Tests were performed from 1 h to 28 days and the obtained oxide layers were characterized using MEB, EDX, XPS, XRD and GD-OES. The oxide layers were mainly composed of chromia containing TiO 2 and thickening with time. Aluminium oxide formed internally. Other oxides were detected in the scale, such as NiO, CoO, MoO 3 and MnO 2 , except for the lowest oxygen partial pressure experiments, where a selective oxidation took place. The scale-growth mechanism was cationic for low and medium oxygen partial pressure conditions. A growth following a transient oxidation mechanism was observed for high oxygen partial pressure.

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Section: Xps Analysesmentioning

confidence: 98%

Influence of the Oxygen Partial Pressure on the Oxidation of Inconel 617 Alloy at High Temperature

et al. 2010

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“…In comparison, the Al 2p binding energy for a-Al 2 O 3 is 74.2 eV. [20] The distribution of Hf and Al across the film thickness observed during the layer-by-layer ion etching of the films is shown in Figure 7. It follows from these data that the formation of the steady distribution of the elements across the film thickness is observed at the initial stages of film growth.…”

Section: Chemical Structurementioning

confidence: 99%

“…According to the literature data, in the stoichiometric HfO 2 , parameterĩ s equal to 513.3-513.4 eV. [19,20] The dependence of The films deposited at a substrate temperature of 650 8C contain nearly 5 at.-% of carbon. As it follows from comparison of the decomposition mechanism of Hf(dpm) 4 ( Fig.…”

Section: Chemical Structurementioning

confidence: 99%

MOCVD and Physicochemical Characterization of (HfO₂)_x(Al₂O₃)_1‐x Thin Films

Smirnova

Lebedev

Морозова

et al. 2010

Chemical Vapor Deposition

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Investigation of the thermal behavior of Hf(dpm) 4 vapor in vacuum is carried out. An approach for obtaining films of (HfO) x (Al 2 O 3 ) 1-x alloys is developed. The use of a source containing a mixture of two precursors differing from each other in volatility, notably Hf(dpm) 4 (dpm ¼ dipivaloylmethanate, 2,2,6,6-tetramethylheptane-3,5-dionate) and Al(acac) 3 (acac ¼ pentane-2,4-dionate), allows us to employ the possibilities of combinatorial chemistry, and to obtain and analyze a number of different compositions of alloys. Film characterization is performed using a set of analytical methods. The character of Al and Hf distributions across the film thickness, depending on their content in the source, is investigated. The use of laser null ellipsometry allows us to determine the distribution of the refractive index across the thickness of the (HfO) x (Al 2 O 3 ) 1-x film. A comparison of the ellipsometric data with the X-ray photoelectron spectroscopy (XPS) data shows that the character of the refractive index variation reproduces the variation of the chemical composition across the film thickness. A uniform distribution of the elements across the film thickness is observed in the cases when separated sources are used. The structure of the film depends on the molar fraction of Al 2 O 3 in alloys. For Al ! 30 at.-% amorphization of the structure occurs.

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“…Lithium and lithium ion rechargeable batteries offer an operative voltage and energy density higher than those of other rechargeable battery systems, and have various applications ranging from portable electronic devices to zero emission vehicles (Kosova and Devyatkina, 2004). The capacity of lithium batteries is limited mostly by the properties of electrode materials.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that the electrical properties of LiV 3 O 8 , such as discharge capacity, discharge rate and reversibility and cyclability, depend on the method of synthesis of the compound and the conditions under which the cathode is prepared (Koval'chuk et al, 2002). Several methods of production and processing LiV 3 O 8 electrodes have been reported they are based on fast cooling (West et al, 1987), hydrothermal treatment (Eriksson and Alm, 1993), substitution of vanadium with other metal cations (Takeuchi et al, 2003;Jouanneau et al, 2003;Lu et al, 2004;Park, 2005), dehydration of the lithium vanadate aqueous gel (Kosova and Devyatkina, 2002) (Manev et al, 1995) and ultrasonic treatment (Kumagai and Yu, 1997).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of LiV3O8 nanocrystallites as cathode materials for lithium ion batteries

Yang

Zhang

et al. 2008

Journal of Materials Processing Technology

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Surface chemistry study of LiCoO2 coated with alumina

Cited by 55 publications

References 9 publications

Influence of the Oxygen Partial Pressure on the Oxidation of Inconel 617 Alloy at High Temperature

Influence of the Oxygen Partial Pressure on the Oxidation of Inconel 617 Alloy at High Temperature

MOCVD and Physicochemical Characterization of (HfO₂)_x(Al₂O₃)_1‐x Thin Films

Synthesis of LiV3O8 nanocrystallites as cathode materials for lithium ion batteries

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Surface chemistry study of LiCoO2 coated with alumina

Cited by 55 publications

References 9 publications

Influence of the Oxygen Partial Pressure on the Oxidation of Inconel 617 Alloy at High Temperature

Influence of the Oxygen Partial Pressure on the Oxidation of Inconel 617 Alloy at High Temperature

MOCVD and Physicochemical Characterization of (HfO2)x(Al2O3)1‐x Thin Films

Synthesis of LiV3O8 nanocrystallites as cathode materials for lithium ion batteries

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MOCVD and Physicochemical Characterization of (HfO₂)_x(Al₂O₃)_1‐x Thin Films