Evaluation of elastic modulus of Li₂S–P₂S₅ glassy solid electrolyte by ultrasonic sound velocity measurement and compression test

Abstract

Elastic modulus is an important factor of solid electrolytes for an all-solid-state battery as a next-generation battery. In this study, Young's moduli of dense pellets of the Li 2 SP 2 S 5 glass solid electrolytes prepared by room temperature pressing and hot pressing were investigated. The Young's moduli of Li 2 SP 2 S 5 hot-pressed pellets measured by ultrasonic sound velocity measurements were 1825 GPa and those of cold-pressed pellets were about 1417 GPa. The compression test was also done to determine Young's modulus. The Young's modulus of Li 2 SP 2 S 5 glasses increased with increasing the Li 2 S content in both hot press and cold press pellets. The Young's moduli were lower than those of oxide based solid electrolytes.

Compliant glass–polymer hybrid single ion-conducting electrolytes for lithium batteries

“…PFPE-diol is a viscous liquid, with room temperature viscosity of 0.12 Pa.s. The shear modulus of our hybrid electrolyte is 2.6 MPa, three orders of magnitude lower than that of a glass sulfide reported by Sakuda et al (8), which exhibited a shear modulus of 5.9 GPa (sample prepared with a molding pressure of 360 MPa). The composite electrolyte, thus, has drastically improved the adhesive properties of the electrolyte with a relatively minor effect on ionic conductivity.…”

“…Concentration polarization is absent in single-ion conductors, wherein the anions are immobilized (2). Nonflammable, single ionconducting solid electrolytes have the potential to dramatically improve safety and performance of lithium batteries (3-6).Solid electrolytes, such as inorganic sulfide glasses (Li 2 S-P 2 S 5 ), are single-ion conductors with high shear moduli (18-25 GPa) and high ionic conductivity (over 10 −4 S/cm) at room temperature (7,8). However, these materials, on their own, cannot serve as efficient electrolytes, because they cannot adhere to moving boundaries of the active particles in the battery electrode as they are charged and discharged.…”

“…Solid electrolytes, such as inorganic sulfide glasses (Li 2 S-P 2 S 5 ), are single-ion conductors with high shear moduli (18-25 GPa) and high ionic conductivity (over 10 −4 S/cm) at room temperature (7,8). However, these materials, on their own, cannot serve as efficient electrolytes, because they cannot adhere to moving boundaries of the active particles in the battery electrode as they are charged and discharged.…”

“…3A shows the NMR spectrum of the neat liquid electrolyte, whereas Fig. 3B shows the NMR spectrum of a suspension of the hybrid electrolyte in deuterated THF-d 8 . The spectra are similar, indicating that PFPE chains remain intact during the milling process.…”

Review—Practical Challenges Hindering the Development of Solid State Li Ion Batteries

“…Their deformation properties, wholly different from their oxide counterparts, 24,25 facilitate the consolidation of sulfide SSEs into dense bodies of various geometric form factors and the resulting increase in bulk density can increase conductivity. [88][89][90] Doped LPS of congruently melting compositions, such as the argyrodite (Li 6 PS 5 X where X = Cl, Br, I) family, can exhibit superior conductivity and electrochemical stability in comparison to pure LPS counterparts.…”