Glass formation and ionic conduction in the M2SGeS2 (M = Li, Na, Ag) systems

Souquet, J.L.; Robinel, E.; Barrau, B.; Ribes, M.

doi:10.1016/0167-2738(81)90105-3

Cited by 118 publications

(92 citation statements)

References 4 publications

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“…Glasses with adequate compositions were synthesized in evacuated silica tubes from previously prepared GeS 2 , SiS 2 and M 2 S (M = Na, Li) following a procedure already described [5,13,14]. X-ray diffraction measurements did not reveal the presence of crystalline impurities in the samples.…”

Section: Sample Preparationmentioning

confidence: 99%

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XPS valence band spectra and theoretical calculations for investigations on thiogermanate and thiosilicate glasses

et al. 2006

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Section: Sample Preparationmentioning

confidence: 99%

“…Conductivity and NMR spin lattice relaxation measurements have been used to investigate the cation-hopping dynamics [5][6][7][8][9][10][11][12]. Neutron diffraction studies, NMR, Raman, IR, etc.…”

Section: Introductionmentioning

confidence: 99%

XPS valence band spectra and theoretical calculations for investigations on thiogermanate and thiosilicate glasses

et al. 2006

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“…8,9 LiPON thin films have been shown to have good stability in contact with lithium and have high cyclability. 10 However, this easily prepared material has a relatively low Li þ ion conductivity of ∼10 -6 (S/cm) at 25°C as compared to other solid electrolytes such as sulfides whose Li þ ion conductivities are in the range of 10 -3 (S/cm) at 25°C. [11][12][13] Lithium containing thio-materials show higher ionic conductivities than corresponding oxide materials and as a result much research is being performed to investigate the use of thiomaterials as solid electrolytes.…”

Section: Introductionmentioning

confidence: 98%

Structural Properties of Lithium Thio-Germanate Thin Film Electrolytes Grown by Radio Frequency Sputtering

Seo

Martin

2011

Inorg. Chem.

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In this study, lithium thio-germanate thin film electrolytes have been successfully prepared by radio frequency (RF) magnetron sputtering deposition in Ar gas atmospheres. The targets for RF sputtering were prepared by milling and pressing appropriate amounts of the melt-quenched starting materials in the nLi2S + GeS2 (n = 1, 2, and 3) binary system. Approximately 1 μm thin films were grown on Ni coated Si (Ni/Si) substrates and pressed CsI pellets using 50 W power and 25 mtorr (3.3 Pa) Ar gas pressures to prepare samples for Raman and Infrared (IR) spectroscopy, respectively. To improve the adhesion between the silicon substrate and the thin film electrolyte, a sputtered Ni layer (120 nm) was used. The surface morphologies and thickness of the thin films were determined by field emission scanning electron microscopy (FE-SEM). The structural properties of the starting materials, target materials, and the grown thin films were examined by X-ray diffraction (XRD), Raman, and IR spectroscopy. Disciplines Materials Science and Engineering | Physical Chemistry CommentsReprinted with permission from Inorganic Chemistry 50 (2011) ABSTRACT: In this study, lithium thio-germanate thin film electrolytes have been successfully prepared by radio frequency (RF) magnetron sputtering deposition in Ar gas atmospheres. The targets for RF sputtering were prepared by milling and pressing appropriate amounts of the meltquenched starting materials in the nLi 2 S þ GeS 2 (n = 1, 2, and 3) binary system. Approximately 1 μm thin films were grown on Ni coated Si (Ni/Si) substrates and pressed CsI pellets using 50 W power and 25 mtorr (∼3.3 Pa) Ar gas pressures to prepare samples for Raman and Infrared (IR) spectroscopy, respectively. To improve the adhesion between the silicon substrate and the thin film electrolyte, a sputtered Ni layer (∼120 nm) was used. The surface morphologies and thickness of the thin films were determined by field emission scanning electron microscopy (FE-SEM). The structural properties of the starting materials, target materials, and the grown thin films were examined by X-ray diffraction (XRD), Raman, and IR spectroscopy.

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“…Ionic conduction of Na + ion with ionic radius larger than Li + ion is unfavorable in glasses (Souquet et al, 1981). For sodium ion conductors, sulfides with high conductivity had not been found since this report described Na3PS4 glass-ceramic electrolytes in 2012.…”

Section: Conductivitymentioning

confidence: 99%

Development of Sulfide Solid Electrolytes and Interface Formation Processes for Bulk-Type All-Solid-State Li and Na Batteries

2016

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All-solid-state batteries with inorganic solid electrolytes (SEs) are recognized as an ultimate goal of rechargeable batteries because of their high safety, versatile geometry, and good cycle life. Compared with thin-film batteries, increasing the reversible capacity of bulk-type all-solid-state batteries using electrode active material particles is difficult because contact areas at solid-solid interfaces between the electrode and electrolyte particles are limited. Sulfide SEs have several advantages of high conductivity, wide electrochemical window, and appropriate mechanical properties, such as formability, processability, and elastic modulus. Sulfide electrolyte with Li7P3S11 crystal has a high Li + ion conductivity of 1.7 × 10 −2 S cm −1 at 25°C. It is far beyond the Li + ion conductivity of conventional organic liquid electrolytes. The Na + ion conductivity of 7.4 × 10 −4 S cmis achieved for Na3.06P0.94Si0.06S4 with cubic structure. Moreover, formation of favorable solid-solid interfaces between electrode and electrolyte is important for realizing solid-state batteries. Sulfide electrolytes have better formability than oxide electrolytes. Consequently, a dense electrolyte separator and closely attached interfaces with active material particles are achieved via "room-temperature sintering" of sulfides merely by cold pressing without heat treatment. Elastic moduli for sulfide electrolytes are smaller than that of oxide electrolytes, and Na2S-P2S5 glass electrolytes have smaller Young's modulus than Li2S-P2S5 electrolytes. Cross-sectional SEM observations for a positive electrode layer reveal that sulfide electrolyte coating on active material particles increases interface areas even with a minimum volume of electrolyte, indicating that the energy density of bulk-type solid-state batteries is enhanced. Both surface coating of electrode particles and preparation of nanocomposite are effective for increasing the reversible capacity of the batteries. Our approaches to form solid-solid interfaces are demonstrated.

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Glass formation and ionic conduction in the M2SGeS2 (M = Li, Na, Ag) systems

Cited by 118 publications

References 4 publications

XPS valence band spectra and theoretical calculations for investigations on thiogermanate and thiosilicate glasses

XPS valence band spectra and theoretical calculations for investigations on thiogermanate and thiosilicate glasses

Structural Properties of Lithium Thio-Germanate Thin Film Electrolytes Grown by Radio Frequency Sputtering

Development of Sulfide Solid Electrolytes and Interface Formation Processes for Bulk-Type All-Solid-State Li and Na Batteries

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