Conductivity studies on LiX–Li2S–Sb2S3–P2S5 (X = LiI or Li3PO4) glassy system

Abstract

New sulfide glasses in the Li 2 S-Sb 2 S 3 -P 2 S 5 system have been prepared by classical quenching technique where glassy domain remains up to 50% molar addition of Li 2 S and electrical conductivities have been determined by impedance spectroscopy. Room temperature DC conductivity vs Li 2 S content exhibits two regions implying different conductivity mechanisms. The compositions of low lithium content presented low electronic conductivities close to 0.01 μS/cm at room temperature (due to Sb 2 S 3 semiconducting properties). The compositions of medium lithium content could result to mixed ionic-electronic conductors with predominant ionic conductivity with a maximum close to 1 μS/cm; Arrhenius behavior is found between 25°C and T g for all glasses, but activation energy is found to be somehow above most similar systems. A comparative study with glasses belonging to the other chalcogenide systems has been undertaken and values of the decoupling index are reported, and in order to validate conductivity data, a circuit equivalent circuit was proposed and fitted parameters were calculated with good agreement.

Ceramic and polymeric solid electrolytes for lithium-ion batteries

“…2 [10,11,[23][24][25]. The conductivity of Li 2 S-SiS 2 is similar to that of Li 2 S-P 2 S 5 , but can be improved with lithium silicate (Li 4 SiO 4 ) additions.…”

Membranes in Lithium Ion Batteries

“…Li 2 S-P 2 S 5 systems have shown very good Li ion conductivity, higher than 10 −3 S cm −1 [29,30,31]. The exploration of some other sulfide glasses has also been demonstrated, like Li 3 PO 4 -Li 2 S-SiS 2 glass [32], LiI-Li 2 S-Ga 2 S 3 -GeS 2 [33], and LiI-Li 2 S-Sb 2 S 3 -P 2 S 5 [34], etc. The rate performances of all-solid-state cells by the utilization of highly conductive glass-ceramic electrolytes were investigated by scientists from Japan.…”

Preparation of Li3PS4–Li3PO4 Solid Electrolytes by Liquid-Phase Shaking for All-Solid-State Batteries

“…Doping Li 3 PS 4 with oxygen (75Li 2 S•23P 2 S 5 •2P 2 O 5 ) resulted in the increase of ionic conductivity at room temperature (RT) from 1.83 × 10 −4 Scm −1 to 2.53 × 10 −4 Scm −1 [33]. However, Li 3 PO 4 has been employed as a common additive to improve the ionic conductivity and electrochemical property of sulfide-based solid electrolytes [7,[34][35][36]. In this study, 100Li 3 PS 4 •xLi 3 PO 4 solid electrolytes were prepared by liquid-phase synthesis using ethyl propionate (EP).…”