Effect of the temperature on the structural and textural properties of a compressed K-vermiculite

Balima, Félix; Nguyen, A.-N.; Reinert, Laurence; Floch, Sylvie Le; Pischedda, V.; Duclaux, Laurent; San-Miguel, Alfonso

doi:10.1016/j.ces.2015.05.061

Cited by 17 publications

(3 citation statements)

References 25 publications

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“…The ceramic film exhibits an intrinsically high‐temperature stability over 800 °C, despite a minor but continuing weight loss commencing at 250 °C which is ascribed to the thermal dehydration of OH groups and crystal phase transition [ 9 ] (Figure S4, Supporting Information). And the intact fiber structure of the ceramic film retains as a result of crystal lattice construction [ 10 ] (Figures S5 and S6, Supporting Information). This ultrathin, fire‐proof framework is therefore denoted as UFF, which is totally water‐free after 800 °C heat treatment (Figure S7, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

High Energy Density Solid State Lithium Metal Batteries Enabled by Sub‐5 µm Solid Polymer Electrolytes

et al. 2021

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Solid‐state batteries (SSBs) are considered as the most promising next‐generation high‐energy‐density energy storage devices due to their ability in addressing the safety concerns from organic electrolytes and enabling energy dense lithium anodes. To ensure the high energy density of SSBs, solid‐state electrolytes (SSEs) are required to be thin and light‐weight, and simultaneously offer a wide electrochemical window to pair with high‐voltage cathodes. However, the decrease of SSE thickness and delicate structure may increase the cell safety risks, which is detrimental for the practical application of SSBs. Herein, to demonstrate a high‐energy‐density SSB with sufficient safety insurance, an ultrathin (4.2 µm) bilayer SSE with porous ceramic scaffold and double‐layer Li+‐conducting polymer, is proposed. The fire‐resistant and stiff ceramic scaffold improves the safety capability and mechanical strength of the composite SSE, and the bilayer polymer structure enhances the compatibility of Li metal anode and high‐voltage cathodes. The 3D ceramic facilitates Li‐ion conduction and regulates Li deposition. Thus, high energy density of 506 Wh kg−1 and 1514 Wh L−1 is achieved based on LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes with a low N/P ratio and long lifespan over 3000 h. High‐energy‐density anode‐free cells are further demonstrated.

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Section: Resultsmentioning

confidence: 99%

High Energy Density Solid State Lithium Metal Batteries Enabled by Sub‐5 µm Solid Polymer Electrolytes

et al. 2021

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“…The average chemical composition of the half lattice cell calculated from elemental analysis is (Si 3 Al)Mg 2.62 Fe 0.32 T i 0.06 O 10 (OH) 2 K 0.61 . More details on the sample and on the sonication procedure were given in the previous works [17,18]. The samples used for the SAS experiments were made by pre-compacting the vermiculite powder at a pressure P c = 350 bar or 800 bar, resulting in two different pellet densities.…”

Section: Samples and High-pressure Cellsmentioning

confidence: 99%

Porosity evolution of expanded vermiculite under pressure: the effect of pre-compaction

et al. 2019

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The evolution of the pore structure of compressed expanded vermiculite was investigated in situ under uniaxial stress up to 3200 bar using small-angle neutron and X-ray scattering. The studied samples have a lamellar texture in which the presence of oriented oblate pores was revealed by the anisotropic small-angle scattering patterns. The initial pore size distribution and the mechanical behaviour of the pellets at working pressure conditions are strongly related to the applied initial stresses used to pre-compact the vermiculite powder. Our study shows that the porous structure of the pellets was not modified under compression up to the pre-compaction pressure. Higher densification is associated with increasing anisotropy of the pore-matrix interface structure. The pore-matrix interface could be described with fractal geometry. The stress dependence of the system fractal dimension, apparent specific surface area and total porosity was determined and related to the meso-and macropore evolution under uniaxial stress.

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“…Vermiculite has also a layered structure, similar to MMT, but with a higher degree of structural disorder and a greater degree of expansion when heated, due to the presence of interlayer water molecules [ 61 ]. Vermiculite is a naturally occurring mineral that belongs to the phyllosilicate group of minerals, with a chemical formula (Mg,Fe 2+ ,Fe 3+ ) 3 [(Al,Si) 4 O 10 ] and an intercalated repeated unit (OH) 2 ·4H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Amplifying the dielectric constant of shellac by incorporating natural clays for organic field effect transistors (OFETs)

KIM,

YUMUSAK,

IRIMIA

et al. 2023

Turkish Journal of Chemistry

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We demonstrate in this work the practical use of uniform mixtures of a bioresin shellac and four natural clays, i.e. montmorillonite, sepiolite, halloysite and vermiculate as dielectrics in organic field effect transistors (OFETs). We present a thorough characterization of their processability and film forming characteristic, surface characterization, elaborate dielectric investigation and the fabrication of field effect transistors with two classic organic semiconductors, i.e. pentacene and fullerene C60. We show that low operating voltage of approximately 4 V is possible for all the OFETs using several combinations of clays and shellac. The capacitance measurements show an improvement of the dielectric constant of shellac by a factor of 2, to values in excess of 7 in the uniform mixtures of sepiolite and montmorillonite with this bioresin.

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Effect of the temperature on the structural and textural properties of a compressed K-vermiculite

Cited by 17 publications

References 25 publications

High Energy Density Solid State Lithium Metal Batteries Enabled by Sub‐5 µm Solid Polymer Electrolytes

High Energy Density Solid State Lithium Metal Batteries Enabled by Sub‐5 µm Solid Polymer Electrolytes

Porosity evolution of expanded vermiculite under pressure: the effect of pre-compaction

Amplifying the dielectric constant of shellac by incorporating natural clays for organic field effect transistors (OFETs)

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