Influence of the Halogen in Argyrodite Electrolytes on the Electrochemical Performance of All-Solid-State Lithium Batteries

Longlong Wang, Guy Rahamim, Kirankumar Vudutta, Nicole Leifer, Ran Elazari, Ilan Behar, Malachi Noked, David Zitoun

Research output: Contribution to journalArticlepeer-review


All-solid-state lithium batteries (ASSLBs) are considered as an alternative solution to lithium-ion batteries, because of their safety and high theoretical energy density. Argyrodite-based solid-electrolytes (SEs), Li6PS5X (X = Cl, Cl0.5Br0.5 or Br), are promising candidates for ASSLBs. Most of the previous reports have used Li6PS5Cl as the default SE composition. Here, the electrochemical behavior of three different argyrodites with Cl or Br, or both, as the halogen is systematically studied. Using LiNi0.6Co0.2Mn0.2O2 as a model cathode, the behavior of these SEs in ASSLB cells is also studied. SEs containing Br show higher near-room-temperature ionic conductivity (>2 mS cm−1) and the critical current density (≥1 mA cm−2) during Li plating/stripping, and are stable up to 5 V versus Li/Li+. Li6PS5Br gives the best electrochemical performance in terms of C-rate and long-term cycling among the three samples. Specifically, the cathode delivers an initial reversible capacity of 156 mAh g−1, with ≈27% irreversible capacity loss and 90% capacity retention over 100 cycles, and >99% Coulombic efficiency. It delivers ≈56 mAh g−1 at 10C, 36% of its initial capacity at 0.2C, whereas Li6PS5Cl and Li6PS5Cl0.5Br0.5 deliver only 20 and 46 mAh g−1 at 10C.

Original languageEnglish
Article number2201116
JournalEnergy Technology
Issue number3
StatePublished - Mar 2023

Bibliographical note

Funding Information:
This work was supported by ICL Industrial products (ICL‐IP).

Publisher Copyright:
© 2022 The Authors. Energy Technology published by Wiley-VCH GmbH.


  • all-solid-state lithium batteries
  • argyrodite
  • high voltage
  • interface stability
  • sulfide electrolytes


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