Electrical conductivity and relative permittivity of KHCO3

Abdel‐Kader, M. M.; Fadly, M.; Taleb, M.; Eldehamy, K.; Ahmed, A. Razzaque

doi:10.1002/pssa.2211420108

Cited by 12 publications

(9 citation statements)

References 15 publications

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“…[ 20 ] The discovery of KHCO 3 and K 4 CO 4 demonstrates that, when using ester‐based carbonate electrolyte, more metastable products form in the potassium‐based SEI, which is different to the situation in lithium batteries. The large metastable inorganic products may cut off the ionic transport path [ 26 ] of the SEI and their decomposition upon cycling may lead to possible gas formation and porous morphology of K dendrites.…”

Section: Resultsmentioning

confidence: 99%

Enabling Atomic‐Scale Imaging of Sensitive Potassium Metal and Related Solid Electrolyte Interphases Using Ultralow‐Dose Cryo‐TEM

et al. 2021

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Potassium‐based solid electrolyte interphases (SEIs) have a much smaller damage threshold than their lithium counterpart; thus, they are significantly more beam sensitive. Here, an ultralow‐dose cryogenic transmission electron microscopy (cryo‐TEM) technique (≈8 e Å−2 s−1 × 10 s), which enables the atomic‐scale chemical imaging of the electron‐beam‐sensitive potassium metal and SEI in its native state, is adapted. The potassium‐based SEI consists of large brackets of diverse inorganic phases (≈hundreds of nanometers) interspersed with amorphous phases, which are different from the tiny nanocrystalline inorganic phases (≈a few nanometers) formed in a lithium‐based SEI. Organic phosphate‐based electrolyte solvents induce the formation of a thin and stable SEI layer for enhanced cycling performance, while the carbonate ester‐based electrolytes result in large quantities of metastable KHCO3, and K4CO4 products in the SEI, depleting the potassium reserves in the battery. The findings provide deep insights and guidance in the selection of optimum electrolytes that should be used for potassium batteries.

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Section: Resultsmentioning

confidence: 99%

Enabling Atomic‐Scale Imaging of Sensitive Potassium Metal and Related Solid Electrolyte Interphases Using Ultralow‐Dose Cryo‐TEM

et al. 2021

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“…Such behavior strongly supports the existence of structural phase transition. It is known that the change in and/or the weakening of the hydrogen bonding are the primary cause of the structural phase transitions [3][4][5][6][7][8][9]. For example, the phase transition in ammonium sulphate (NH 4 ) 2 SO 4 is not of the order-disorder type but rather involves a change in the hydrogen bonding of the ammonium ion into sulphate ion, i.e.…”

Section: Discussionmentioning

confidence: 99%

“…The formation of hydrogen bond in a compound strongly modifies many physical properties because it alters the size, shape and arrangement of atoms as well as the electronic structure of the functional groups [2]. Recent studies clarified also that the H-bond is the main cause of the phase transition in some dielectric compounds [3][4][5][6][7][8][9]. Furthermore in some cases, ferroelectric properties are explained according to the behavior of the H-bond in crystals [10].…”

Section: Introductionmentioning

confidence: 99%

Phase Transitions in Some Hydrogen-Bonded Molecules

Abdel‐Kader

Gwaily

Zayat

2002

phys. stat. sol. (a)

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The calorimetric parameters including the heat capacity, thermal conductivity and thermal diffusivity are measured and/or determined as a function of temperature (310 K < T < 400 K) for two hydrogen-bonded molecules, namely anthralinic acid C 6 H 4 COOHNH 2 and p-nitrophenol C 6 H 4 NO 2 OH. It seems likely that the first compound undergoes a structural phase transition around 354 K whereas for the second compound the transition temperature is 336 K. Furthermore, the order of magnitude of the above-mentioned parameters suggests that the two compounds under current investigation behave as poorly conducting materials. The thermogravimetric analysis (TGA) for the two compounds was carried out. An interpretation of our data has been outlined on the basis of the crystal structure including the arrangement of the hydrogen bonding system in each compound.

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“…Over the last several years, and also at present, our research program is centered on the investigation of phase transition in some organic, inorganic and/or complex compounds [1][2][3][4][5][6][7] through the study of their electrical, calorimetric and/or thermal parameters at different temperatures. Most of the investigated compounds are hydrogen-bonded in their crystalline states.…”

Section: Introductionmentioning

confidence: 99%