Mechanochemically synthesized amorphous superionic systems for solid-state batteries

Dalvi, Anshuman

doi:10.1016/s0167-2738(02)00083-8

Cited by 16 publications

(11 citation statements)

References 6 publications

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“…Very recently it is demonstrated by various workers that fast ionically conducting amorphous phases can also be achieved by mechanical milling at room temperature in Ag þ [1][2][3][4] and Li þ [5][6][7] ion conductors. In this simple room temperature processing technique a suitable mixture is kept in an agate/steel bowl with agate/steel balls.…”

Section: Introductionmentioning

confidence: 99%

“…It is a room temperature processing technique and can be especially useful if the mixture contains thermally unstable components (e.g., Ag 2 O, PbF 2 , etc.). Mechanochemically synthesized amorphous superionic systems have also been used successfully as electrodes [8,9] and electrolytes [1,10] in solid-state batteries. Recently in a comparative crystallization kinetics study of melt-quenched versus mechanically ball-milled AgIAg 2 O-CrO 3 system, the latter is demonstrated to be more disordered and thermally stable than the former [11].…”

Section: Introductionmentioning

confidence: 99%

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Formation of superionically conducting amorphous phase in mechanically-milled AgI–Ag2O–V2O5 system

Dalvi

Shahi

2004

Journal of Non-Crystalline Solids

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of superionically conducting amorphous phase in mechanically-milled AgI–Ag2O–V2O5 system

Dalvi

Shahi

2004

Journal of Non-Crystalline Solids

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“…Moreover, since there is no precipitation of MoO 3 -based compound, it may be suggested that this compound may be either in very small crystalline amount or the annealing is unable to eliminate the MoO 3 from the glassy system. Similarly, it was also proposed that heating the glass above T c may not completely eliminate amorphous state [5]. Figure 3 shows the DSC scans performed at different heating rates viz.…”

Section: X-ray Diffractionmentioning

confidence: 94%

“…Hence, these have been thoroughly investigated in last three decades [1][2][3][4]. These highly ion conducting, electrochemically stable, and chemically homogeneous glassy superionic conductors have been prepared recently using alternative methods viz., mechanochemical synthesis (high energy ball milling) [5], sol-gel technique [6], and microwave processing [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of mixed glass formers on the crystallization kinetics in AgI–Ag2O–V2O5–MoO3 glassy superionic system

Gupta

Dalvi

2011

Ionics

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The crystallization and glass transition kinetics using differential scanning calorimetry (DSC) in 50AgI-33.33Ag 2 O-16.67[(V 2 O 5 ) 1−x -(MoO 3 ) x ] superionic glassy system is discussed. Thermal stability of glass, studied using various criteria, does not vary significantly with glass former variation. However, the activation energies for structural relaxation (E s ) at glass transition temperature and crystallization (E c ) obtained using Moynihan and Kissinger, Matusita-Sakka formulations found to exhibit interesting trends with MoO 3 substitution in the glass matrix. It is noticed that the electrical conductivity (σ)-temperature (T) cycles obtained at a typical heating rate of 1°C/min do exhibit significant thermal events. The conductivity after first heating cycle at room temperature is found to be increasing with MoO 3 content and maximum for x=0.3 (~10 −3 Ω −1 cm −1 at 30°C) which is comparable to that of the host 50AgI-33.33Ag 2 O-16.67V 2 O 5 glassy system. The parameters obtained from σ-T plots and DSC scans do complement each other in a particular range of composition.

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“…Ionic motion is a very interesting and challenging problem in condensed matter science. More recently, high energy ball-milling at room temperature has been successfully used to form amorphous fast ionic conductors FICs [1][2][3][4]. The mechanochemically-milled (MM) glasses generally have a higher conductivity, lower glass transition (T g ) and crystallization (T c ) temperatures.…”

Section: Introductionmentioning

confidence: 99%

Characterization and characteristics of mechanochemically synthesized amorphous fast ionic conductor 50 SISOMO (50AgI–25Ag2O–25MoO3)

Dayal¹,

Shahi²

2006

Progress in Crystal Growth and Characterization of Materials

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Mechanochemically synthesized amorphous 50SISOMO [50AgI-25Ag 2 O-25MoO 3 ] fast ionic conductor shows high ionic conductivity of ~ 6x10 −3 Ω −1 cm −1 at room temperature. The highest ionic conductivity is achieved for 36 h milled sample, which is more than three orders of magnitude higher than that of crystalline AgI at room temperature. The samples are thermally stable at least up to ~70 °C. Thermoelectric power studies on 50 SISOMO amorphous fast ionic conductors (a-SIC) have been carried out in the temperature range 300-330K. Thermoelectric power (S) is found to vary linearly with the inverse of the absolute temperature, and can be expressed by the equation −S = [(0.19 × 10 3 /T) + 0.25] mV/K. The heat of transport (q * ) of Ag + ion i.e. 0.19 eV is nearly equal to the activation energy (E ) i.e. 0.20 eV of Ag + ion migration calculated from the conductivity plots indicating that the material has an average structure. This is also in consonance with earlier theories on heats of transport of ions in ionic solids.

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Mechanochemically synthesized amorphous superionic systems for solid-state batteries

Cited by 16 publications

References 6 publications

Formation of superionically conducting amorphous phase in mechanically-milled AgI–Ag2O–V2O5 system

Formation of superionically conducting amorphous phase in mechanically-milled AgI–Ag2O–V2O5 system

Effect of mixed glass formers on the crystallization kinetics in AgI–Ag2O–V2O5–MoO3 glassy superionic system

Characterization and characteristics of mechanochemically synthesized amorphous fast ionic conductor 50 SISOMO (50AgI–25Ag2O–25MoO3)

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