Evaluation of mechanical properties of Na2S–P2S5 sulfide glass electrolytes

Nose, Masashi; Kato, Akira; Sakuda, Atsushi; Hayashi, Akitoshi; Tatsumisago, Masahiro

doi:10.1039/c5ta05590c

Cited by 66 publications

(60 citation statements)

References 29 publications

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“…Figure 2A shows the dependence of the relative density of 75Li2S⋅25P2S5 and 75Na2S⋅25P2S5 (mol%) glass electrolytes on molding pressure. The relative densities increase gradually with an increase in molding pressure in both glasses at the same alkali compositions of 75 mol% M2S (M = Li or Na), whereas the relative density for the Na2S system is higher than that for the Li2S system (Sakuda et al, 2013a,b;Nose et al, 2015). Cross-sectional SEM images of the 75 mol% M2S pellets pressed at 360 MPa are shown in the inset.…”

Section: Mechanical Propertymentioning

confidence: 98%

“…Young's moduli of SEs are important for keeping favorable contacts even at volume changes of active materials. Those for densified sulfide electrolytes prepared by hot-pressing are determined by an ultrasonic pulse-echo technique and the uniaxial compression tests (Sakuda et al, 2013a,b;Nose et al, 2015). Young's moduli of the sulfide glasses in the systems Li2S-P2S5 and Na2S-P2S5 are presented in Figure 2B.…”

Section: Mechanical Propertymentioning

confidence: 99%

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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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Section: Mechanical Propertymentioning

confidence: 98%

Section: Mechanical Propertymentioning

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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“…The elastic modulus, which measures the stiffness of the material, is related to the bond energy between the cation and anion, and hence the size of the ions . For instance, the Na‐containing sulfide glass (75Na 2 S·25P 2 S 5 ) has a lower elastic modulus than the lithium‐containing sulfide glass (75Li 2 S·25P 2 S 5 ) due to the weaker interaction between the Na + and PS 4 3− than that of the lithium ions and PS 4 3− . Moreover, the sulfide glass can be pressure‐sintered at the room temperature due to the low bond energies that allow the ions to rotate and diffuse upon application of stress, whereas the oxide glass requires a high‐temperature heat treatment for sintering due to the high bond energies.…”

Section: General Criteria For Na‐ion‐conducting Solid Electrolytesmentioning

confidence: 99%

“…[ instance, the Na-containing sulfide glass (75Na 2 S·25P 2 S 5 ) has a lower elastic modulus than the lithium-containing sulfide glass (75Li 2 S·25P 2 S 5 ) due to the weaker interaction between the Na + and PS 4 3− than that of the lithium ions and PS 4 3− . [16] Moreover, the sulfide glass can be pressure-sintered at the room temperature due to the low bond energies that allow the ions to rotate and diffuse upon application of stress, whereas the oxide glass requires a high-temperature heat treatment for sintering due to the high bond energies. [15a] Therefore, the www.advancedsciencenews.com www.small-methods.com choice of the solid electrolyte with respect to the mechanical properties is critical in reducing the elastic modulus that allows a better densification and favorable contact, leading to a higher energy density and an enhanced tolerance to volume changes of electrodes that are often encountered in the operation of all-solid-state battery.…”

Section: General Criteria For Na-ion-conducting Solid Electrolytesmentioning

confidence: 99%

Progress in the Development of Sodium‐Ion Solid Electrolytes

et al. 2017

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The development of safe, reliable, yet economical energy storage has been reemphasized with recent incidents involving the explosion and subsequent recall of lithium‐ion batteries. The organic liquid electrolyte used in the conventional lithium‐ion battery can potentially act as a fuel for combustion in a thermal‐runaway reaction, and hence an alternative with a significantly reduced flammability must be sought. All‐solid‐state batteries have the potential to meet safety and reliability requirements with the possibility of increasing the volumetric energy density of the system, making these a promising candidate for the development of the next generation of energy storage. Moreover, the sodium‐ion battery exhibits a better cost‐efficiency without significantly compromising the energy density, making the combination of the sodium chemistry with the solid electrolyte an attractive choice for safe and economical energy storage. Here, a general background on the recent development of ceramic and glass‐ceramic sodium‐ion‐conducting electrolytes is provided with regard to oxide‐, sulfide‐, and hydride‐based electrolytes. The ionic conductivity, chemical stability, and mechanical properties of the sodium‐based solid electrolyte are discussed, which is followed by a perspective on future developments in the field.

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“…Moreover, in sulfide solid electrolytes, densification is readily induced by pressing at room temperature. 16), 17) The deformability of these electrolytes is also useful in the formation of good interfaces with electrode active materials. Therefore, in view of these superior features, namely, higher conductivity and better deformability, bulk-type allsolid-state batteries using sulfide solid electrolytes have been intensely researched.…”

Section: ¹3mentioning

confidence: 99%

Sodium thiophosphate electrolyte thin films prepared by pulsed laser deposition for bulk-type all-solid-state sodium rechargeable batteries

Ito

Konishi

Noi

et al. 2018

J. Ceram. Soc. Japan

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Sodium rechargeable batteries using earth-abundant raw material sources are more suitable for wide application as compared to lithium batteries. The development of inorganic solid electrolytes with high Na-ion conductivity is indispensable to realize all-solid-state sodium batteries. The sulfide solid electrolyte with cubic Na 3 PS 4 phase has a high sodium-ion conductivity at room temperature. This research has addressed, for the first time, the preparation of Na 3 PS 4 electrolyte thin films using pulsed laser deposition, to be applied in bulk-type allsolid-state sodium batteries. The heat-treated Na 3 PS 4 thin film exhibited a conductivity of 3.5 © 10 ¹5 S cm ¹1 at 25°C and the activation energy for conduction was calculated to be 45 kJ mol ¹1 . The active material in the form of NaCrO 2 particles coated with Na 3 PS 4 thin film was applied in all-solid-state batteries, which functioned as a sodium secondary battery at room temperature.

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Evaluation of mechanical properties of Na₂S–P₂S₅ sulfide glass electrolytes

Cited by 66 publications

References 29 publications

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

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

Progress in the Development of Sodium‐Ion Solid Electrolytes

Sodium thiophosphate electrolyte thin films prepared by pulsed laser deposition for bulk-type all-solid-state sodium rechargeable batteries

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