One-pot aprotic solvent-enabled synthesis of superionic Li-argyrodite solid electrolyte

Young Jin Heo, Seung Deok Seo, Suk Ho Hwang, Sun Hee Choi, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Li-argyrodite phase Li6PS5Cl is a promising solid electrolyte (SE) with potential applications in all-solid-state batteries (ASSBs). Conventional SE synthesis methods such as high-energy ball-milling and solid-state synthesis require a significant amount of energy. Consequently, in recent years, several studies have been conducted on developing liquid phase methods for mass-producing SEs. One such liquid phase method uses tetrahydrofuran (THF, an aprotic solvent) and ethanol (EtOH, a protic solvent) to synthesize Li6PS5Cl. However, the synthesized SE contains impurities that are generated by reactions between EtOH and PS43−. In this study, we present a novel one-pot liquid phase method for synthesizing Li6PS5Cl using THF. The synthesized SE had a high ionic conductivity (2.03 mS·cm−1) and low electronic conductivity (7.44 × 10−8 S·cm−1). Notably, it had few impurities and was essentially composed of a single phase. Furthermore, an ASSB cell composed of LiNbO3-coated LiNi0.6Mn0.2CoO2 (NMC622)/Li6PS5Cl/Li-In, which contained the synthesized SE, exhibited a high discharge capacity of 156 mAh·g−1. Therefore, the liquid phase method proposed herein can be used to synthesize SEs, and can help realize mass production and commercialization.

Original languageEnglish
Pages (from-to)17644-17653
Number of pages10
JournalInternational Journal of Energy Research
Issue number12
Publication statusPublished - 2022 Oct 10

Bibliographical note

Funding Information:
This work was supported by a Korea University Grant and the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning [NRF‐2022R1A2C3003319 and 2018M3D1A1058744]. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF‐2020R1A6A1A03045059).

Funding Information:
Ministry of Science, ICT, and Future Planning, Grant/Award Numbers: 2018M3D1A1058744, 2022R1A2C3003319; National Research Foundation of Korea; Korea University; Ministry of Education, Grant/Award Number: 2020R1A6A1A03045059 Funding information

Publisher Copyright:
© 2022 John Wiley & Sons Ltd.


  • Li-argyrodite
  • all-solid-state lithium batteries
  • liquid-phase synthesis
  • one-pot process
  • sulfide solid electrolyte

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


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