Impact of Solvent Treatment of the Superionic Argyrodite Li₆PS₅Cl on Solid‐State Battery Performance

Abstract

With growing interest in solution‐based processing of electrolytes for all‐solid‐state batteries comes the need to more deeply understand potential detrimental effects of the solvent on electrolyte materials, as well as effects on the cell performance that may not have been evident by structural characterization alone. Herein, the superionic solid electrolyte Li6PS5Cl is treated with five organic solvents selected for a range of different physical and chemical properties. The electrolytes treated with solvents that do not lead to obvious degradation are used in cathode composites of solid‐state batteries In/LiIn│Li6PS5Cl│NCM‐622:Li6PS5Cl. After treatment in some solvents, the solid electrolyte remains seemingly unaffected, but a strong influence on the solid‐state battery performance is observed, revealing underlying effects that warrant deeper study.

Chemical stability of sulfide solid-state electrolytes: stability toward humid air and compatibility with solvents and binders

“…S-SEs are often studied to show their capability of recovering at high temperatures. 94 When degraded S-SEs are heated at temperatures around 250 1C or above, the structure begins to dehydrate, resulting in the recovery of the S-SE phase as reported in several studies. [95][96][97] The chemical stability of S-SEs was studied by ) and meta-thiophosphate (P 2 S 7 4À ) units (Fig.…”

“…This approach has been used in several studies to investigate the chemical instability of S-SEs toward various solvents. 89,94,125,141,154 Tan et al performed a study to examine the effect of most widely used solvents such as xylene (XYL), toluene (TOL), dimethyl carbonate (DMC), acetonitrile (ACN), dimethylformamide (DMF), N-methyl-2-pyrrolidone (NMP), tetrahydrofuran (THF), methyl ethyl ketone (MEK) and water on Li 7 P 3 S 11 . 154 As shown in Fig.…”

“…Pristine Li 6 PS 5 Cl showed a broad particle size distribution relative to the materials treated with the solvents. 94 X-ray photoelectron spectroscopy (XPS) is another technique that is widely used to characterize the chemical stability of S-SEs. [181][182][183] XPS measurement helps in identifying the chemical compositions and understanding the chemistry of the evolution in consequence of S-SEs' instability before, during, and after a specific condition.…”

The Hidden Side of Nanoporous β‐Li3PS4 Solid Electrolyte

“…These results serve as an example of the various questions that still remain concerning solvent‐assisted routes to prepare solid electrolytes and highlight the need of full characterization beyond crystalline fractions, as it was recently pointed out. [ 29 ]…”

Energy Storage Materials for Solid‐State Batteries: Design by Mechanochemistry

“…By contrast, in liquid‐based syntheses the upscaling of these electrolytes may be possible; [ 23,24 ] however, the potential environmental impact based on solvents remains unclear especially as possibly remaining solvent may contaminate the electrolyte. [ 21,25 ]…”