Ultrarapid Phase Conversion in β″‐Alumina Tubes

Henrichsen, Matthew; Hwang, Jin‐Ha; Dravid, Vinayak P.; Johnson, D. Lynn

doi:10.1111/j.1151-2916.2000.tb01646.x

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…Other techniques, such as slip‐casting in a high magnetic field and mechanochemical processing, have also been demonstrated to synthesize alumina powders with favorable orientation and microstructure 218, 219. The granulated β ‐Al 2 O 3 is then fabricated into a tube by annealing or induction‐coupled plasma sintering 220, 221. Figure 13d shows the typical charge/discharge curves and cycling properties of a 30 Ah cell assembled with a β ‐Al 2 O 3 tube.…”

Section: Functional Materials For Rechargeable Sodium‐sulfur Battementioning

confidence: 99%

Functional Materials for Rechargeable Batteries

et al. 2011

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There is an ever-growing demand for rechargeable batteries with reversible and efficient electrochemical energy storage and conversion. Rechargeable batteries cover applications in many fields, which include portable electronic consumer devices, electric vehicles, and large-scale electricity storage in smart or intelligent grids. The performance of rechargeable batteries depends essentially on the thermodynamics and kinetics of the electrochemical reactions involved in the components (i.e., the anode, cathode, electrolyte, and separator) of the cells. During the past decade, extensive efforts have been dedicated to developing advanced batteries with large capacity, high energy and power density, high safety, long cycle life, fast response, and low cost. Here, recent progress in functional materials applied in the currently prevailing rechargeable lithium-ion, nickel-metal hydride, lead acid, vanadium redox flow, and sodium-sulfur batteries is reviewed. The focus is on research activities toward the ionic, atomic, or molecular diffusion and transport; electron transfer; surface/interface structure optimization; the regulation of the electrochemical reactions; and the key materials and devices for rechargeable batteries.

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Section: Functional Materials For Rechargeable Sodium‐sulfur Battementioning

confidence: 99%

Functional Materials for Rechargeable Batteries

et al. 2011

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“…In this manner, a high b"-phase purity was obtained without extended post-sintering annealing times, as usually carried out in conventional processing of b"-Al 2 O 3 alumina and other ceramic materials. [19,24] The morphologies of the as-prepared pseudoboehmite, boehmite, and Na-b"-Al 2 O 3 samples was investigated by TEM. Strong agglomeration occurred in the partially amorphous pseudo-boehmite, forming a continuous network (Figure 3 a).…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, Na-b"-Al 2 O 3 samples with proper crystallographic purity and high ionic conductivities could be obtained by sintering at relatively low temperatures (1500 8C), compared to the other reports in the literature. [15,16] Despite the relevance of Na-b"-Al 2 O 3 for electrochemical applications, [17,18] such as high-temperature batteries and water vapor electrolyzers as well as alkali metal thermal-electric converters, [19] not many surface, morphology, and microchemical characterizations of planar electrolytes based on this material have been reported in the literature. In this work, the structure, morphology and surface properties of a planar Na-b"-Al 2 O 3 ceramic electrolyte are extensively studied [20] by using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy-energy-dispersive X-ray (SEM-EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS), and electrical measurements, providing a data-set of the physicochemical properties useful to assess its perspectives for applications in electrochemical devices.…”

Section: Introductionmentioning

confidence: 97%

Enhanced Ionic Conductivity in Planar Sodium‐β”‐Alumina Electrolyte for Electrochemical Energy Storage Applications

Rosa¹,

Monforte²,

D’Urso³

et al. 2010

ChemSusChem

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Solid Na-β"-Al₂O₃ electrolyte is prepared by a simple chemical route involving a pseudo-boehmite precursor and thermal treatment. Boehmite powder is used for manufacturing the planar electrolyte with appropriate bulk density after firing at 1500 °C. The structure, morphology, and surface properties of precursor powders and sintered electrolytes are investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). As shown by XRD and TEM analyses, nanometer-sized particles are obtained for the boehmite precursor and a pure crystallographic phase is achieved for the sintered electrolyte. SEM analysis of the cross-section indicates good sintering characteristics. XPS shows a higher Na/Al atomic ratio on the surface for the planar electrolyte compared to a commercial tubular electrolyte (0.57 vs. 0.46). Energy-dispersive X-ray microanalysis (EDX) shows an Na/Al ratio in the bulk of 0.16, similar in the two samples. The ionic conductivity of the planar electrolyte is larger than that measured on a commercial tube of sodium-β"-alumina in a wide temperature range. At 350 °C, conductivity values of 0.5 S cm⁻¹ and 0.26 S cm⁻¹ are obtained for the planar electrolyte and the commercial tube, respectively. AC-impedance spectra show smaller grain boundary effects in the planar electrolyte than in the tubular electrolyte. These favorable properties may increase the perspectives for applying planar Na-β"-Al₂O₃ electrolytes in high-temperature batteries.

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