Mechanical properties of fullerite of various composition

Rysaeva, Leysan Kh.

doi:10.1088/1742-6596/938/1/012071

Cited by 2 publications

(1 citation statement)

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“…This dense feature of carbon in CS-DPAN results in unprecedently high tap density for the CS-DPAN composite (≈1.02 g cm −3 ), which was far improved compared to that of the value for the S-DPAN sample (≈0.89 g cm −3 ) was improved to for (Figure S4, Supporting Information). Because fullerite, C 60 , usually has a high tap density of ≈1.95 g cm −3 , [57] it is expected to resolve the main drawback of flaky S-DPAN that results in low energy density. In addition, CHNS analysis confirmed that the as-prepared CS-DPAN composite was composed of ≈57 wt% sulfur, 13 wt% nitrogen, and 30 wt% carbon.…”

Section: Resultsmentioning

confidence: 99%

Sulfurized Carbon Composite with Unprecedentedly High Tap Density for Sodium Storage

Kim

et al. 2021

Advanced Energy Materials

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excellent cycle life, and inexpensive active materials, the operation conditions (300-350 °C) for which the sodium metal is in liquid state should be reconsidered to ensure battery safety. [13][14][15] This constraint suggests the exploration of room-temperature (RT) Na-S batteries that undergo the formation of Na 2 S as the final product, with an energy density of 1274 Wh kg −1 , which is higher than that of the high-temperature Na-S batteries (760 Wh kg −1 ). [16,17] Similar to Li-S batteries, RT Na-S batteries suffer from problems such as poor cycling stability and self-discharge because of compatibility issues between the electrodes and electrolytes. [18,19] The high solubility of the polysulfide in the electrolyte formed during charging and discharging processes causes the polysulfide to migrate to the sodium-metal anode, namely "shuttle effect," resulting in its failure to return to the original sulfur and high-order polysulfide. [20][21][22][23] This phenomenon leads to the continuous loss of the sulfur active materials in the cathode as well as the active area of the sodium-metal anode, which negatively affects the cyclability and rate characteristics. Because the solid-electrolytic interphase (SEI) layer formed by the reaction of the sodium-metal anode and polysulfide is insulating, it directly reflects the battery characteristics. [24,25] Even worse, the volume expansion that occurs during the formation of the polysulfide causes disintegration of the sulfur electrode. [26][27][28] Efforts have been made to overcome the aforementioned drawbacks by investigating all of the battery components, including the cathodes, electrolytes, anodes, and separators. For cathodes, notable improvements have been made by modifying A novel sulfurized carbon decorated by terephthalic acid (TPA) and polyacrylonitrile (PAN), with unprecedently high tap density (≈1.02 g cm −3 ), is investigated. Room-temperature sodium-sulfur batteries offer high energy density; however, the dissolution of the polysulfide is a major factor hindering their commercialization. This dissolution problem can be tolerated by inhibiting the formation of polysulfide through binding sulfur to the carbon structure of PAN. Low sulfur content and low volumetric energy density in the composite are other drawbacks to be resolved. Heat-treated TPA induces a high-density carbonaceous material with high conductivity. This TPA is partly replaced by PAN, and the produced carbon and sulfur are composited with dehydrated polyacrylonitrile (CS-DPAN), which exhibits higher conductivity and surface area than the sulfurized dehydrated polyacrylonitrile (S-DPAN). The CS-DPAN composite electrode exhibits excellent electrochemical performance, and the resulting volumetric capacity is also superior to that of the S-DPAN material electrode. Operando Raman and operando X-ray diffraction analyses confirm that the increased capacity is realized via the avoidance of parasitic C 60 Na 3 formation formed below 1 V, by adjusting the operation voltage range. This finding demonstra...

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Section: Resultsmentioning

confidence: 99%

Sulfurized Carbon Composite with Unprecedentedly High Tap Density for Sodium Storage

Kim

et al. 2021

Advanced Energy Materials

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Stability and deformation behavior of three-dimensional diamond-like carbon phases under compression

Rysaeva

2020

J. Phys.: Conf. Ser.

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Diamond-like phases which are three-dimensional carbon nanostructures consist of sp 3-hybridized atoms is of high interest in terms of their mechanical properties. The important issues are the stability of such novel structures and their deformation behavior under various conditions. In the present work, the molecular dynamics method is used to study diamond-like phases of two classes: fulleranes and tubulanes. Twelve stable structures are found Studying the deformation behavior shows that some phases have a very small elastic regime which not allow calculating elastic constants. Under hydrostatic compression, the main deformation mechanisms are changing the lattice parameters and valent angles. At high pressure, transformation to the amorphous phase takes place for several diamond-like phases.

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Mechanical properties of fullerite of various composition

Cited by 2 publications

References 50 publications

Sulfurized Carbon Composite with Unprecedentedly High Tap Density for Sodium Storage

Sulfurized Carbon Composite with Unprecedentedly High Tap Density for Sodium Storage

Stability and deformation behavior of three-dimensional diamond-like carbon phases under compression

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