Infrared absorption spectra of SiF4 and its clusters in solid parahydrogen

Ooe, Hiroki; Miyamoto, Yuki; Kuma, Susumu; Sasao, N.; Kawaguchi, Kentarou

doi:10.1016/j.cplett.2015.04.057

Cited by 4 publications

(5 citation statements)

References 27 publications

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“…In the gaseous phase of the shelf aged cells with SiO 2 modified separator, tetrafluorosilane SiF 4 was detected (Fig. 3b), 26,27 whereas for the cycled cells with this separator after 40 cycles the formation of SiF 4 was not observed.…”

Section: Resultsmentioning

confidence: 95%

SiO₂-Modified Separators: Stability in LiPF₆-Containing Electrolyte Solutions and Effect on Cycling Performance of Li Batteries

Markevich

Salitra

Afri

et al. 2019

J. Electrochem. Soc.

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Significant improvement in the performance of cells comprising Li metal anodes and LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM 622) cathodes with practical loading of the electrodes material (3.3 mAh cm −2 ) and low amount of the electrolyte solution (22 μl cm −2 ) was achieved with the use of SiO 2 filled polyethylene separators. The effects of cycling and storage on the stability of the SiO 2 filled separators in fluoroethylene carbonate (FEC) and LiPF 6 -containing electrolyte solutions was studied with the use of Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction. We analyzed the composition of the separators and the gas phase after storage and cycling of these cells. Although SiO 2 reacts with LiPF 6 when the separator is in contact with the electrolyte solution, we showed that it is fully stable during cycling in the Li-NCM622 cells. The formation of lithium hexafluorosilicate (Li 2 SiF 6 ) on SiO 2 filled separators and tetrafluorosilane (SiF 4 ) in the gas phase around them was detected when these separators were stored in the electrolyte solutions without cycling. The effect of the electrodes and the operation condition on the stability of SiO 2 containing separators is discussed.

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Section: Resultsmentioning

confidence: 95%

SiO₂-Modified Separators: Stability in LiPF₆-Containing Electrolyte Solutions and Effect on Cycling Performance of Li Batteries

Markevich

Salitra

Afri

et al. 2019

J. Electrochem. Soc.

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“…In the other two gels, bimodal products grow in 22 and 30 days, respectively. The band at 970 cm -1 in spectra of the gel solids may be attributed to the asymmetric stretching vibrations of -Si-F bonds capping the silica gel particles [27][28][29]. This band also presents in the spectra of silicalite-1 crystals synthesized in fluoride media, but are absent for silicalite-1 obtained at the conventional basic conditions (Figure S2b).…”

Section: Synthesis Of Silicalite-1 In Acidic Mediummentioning

confidence: 92%

Silicalite-1 formation in acidic medium: Synthesis conditions and physicochemical properties

Yang

Dib

Lang

et al. 2022

Microporous and Mesoporous Materials

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“…The observed band confirms the presence of (SiF4)2 in this examined soil at 1035 cm -1 (broad) with few shoulders. This value is assigned according to the published literature of Ooe et al (Ooe et al 2015). The presence of SiO2 in the soil is confirmed from the band at 1646 cm -1 and shoulders at 1097 cm -1 (stretching vibration of Si-O-Si bond) and 955 cm -1 (Si-OH vibration).…”

Section: Before Treatment Of Soil With Acidmentioning

confidence: 79%

Thermal and spectroscopic properties of fluoride contaminated soil 21 o 32 ’ 41 ’’ N to 86 o 48 ’ 55 ’’ E of Odisha, India

Sahoo

Jena

Swain

2023

Preprint

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The primary purpose of this investigation is to know thermal properties of soil and extraction of fluoride and its quantitative determination. This study was also carried out to know the fluoride contamination after acid treatment of soil. The specific heat capacity (CP) is measured in heat flux DSC (Differential Scanning Calorimetry) at the heating rate of 2 K min− 1 in an N2 atmosphere using the sapphire standard. The elemental analysis, 19F NMR, TG-DTA, and ATR-IR are carried out for the determination of composition in soil. Fluoride ion is determined using ion selective electrode. This ATR-IR spectrum of soil indicates that Fe, Al and Si, containing fluoride minerals are present in the soil. The CP of this fluoride-contaminated soil is found to be less at higher temperatures and greater at room temperature as compared to other soils. The soil is contaminated with fluoride, confirmed using 19F NMR measurement. The optical band gap calculation from Kubelka–Munk relation indicates that soil is highly insulator. The reflection characteristic is confirmed by Diffuse Reflectance Spectrum (DRS). The concentration of fluoride in 1kg of soil is 12.79 g. as fluoride minerals.The less endothermic behaviour of soil at high temperatures and high endothermic at room temperature further makes the weather extremely hot in summer and cold in winter. The soil still contaminated with fluoride minerals after acid treatment. The minerals release fluoride ion in alkaline medium that is measured using ion selective electrode.

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Infrared absorption spectra of SiF4 and its clusters in solid parahydrogen

Cited by 4 publications

References 27 publications

SiO₂-Modified Separators: Stability in LiPF₆-Containing Electrolyte Solutions and Effect on Cycling Performance of Li Batteries

SiO₂-Modified Separators: Stability in LiPF₆-Containing Electrolyte Solutions and Effect on Cycling Performance of Li Batteries

Silicalite-1 formation in acidic medium: Synthesis conditions and physicochemical properties

Thermal and spectroscopic properties of fluoride contaminated soil 21 o 32 ’ 41 ’’ N to 86 o 48 ’ 55 ’’ E of Odisha, India

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Infrared absorption spectra of SiF4 and its clusters in solid parahydrogen

Cited by 4 publications

References 27 publications

SiO2-Modified Separators: Stability in LiPF6-Containing Electrolyte Solutions and Effect on Cycling Performance of Li Batteries

SiO2-Modified Separators: Stability in LiPF6-Containing Electrolyte Solutions and Effect on Cycling Performance of Li Batteries

Silicalite-1 formation in acidic medium: Synthesis conditions and physicochemical properties

Thermal and spectroscopic properties of fluoride contaminated soil 21 o 32 ’ 41 ’’ N to 86 o 48 ’ 55 ’’ E of Odisha, India

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Product

Resources

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SiO₂-Modified Separators: Stability in LiPF₆-Containing Electrolyte Solutions and Effect on Cycling Performance of Li Batteries

SiO₂-Modified Separators: Stability in LiPF₆-Containing Electrolyte Solutions and Effect on Cycling Performance of Li Batteries