High-Conductivity Argyrodite Li6PS5Cl Solid Electrolytes Prepared via Optimized Sintering Processes for All-Solid-State Lithium-Sulfur Batteries

Shuo WANG, Yibo ZHANG, Xue ZHANG, Ting LIU, Yuan Hua LIN, Yang SHEN, Liangliang LI*, Ce-Wen NAN*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

209 Citations (Scopus)

Abstract

Highly Li-ion conductive Li6PS5Cl solid-state electrolytes (SSEs) were prepared by solid-state sintering method. The influence of sintering temperature and duration on the phase, ionic conductivity, and activation energy of Li6PS5Cl was systematically investigated. The Li6PS5Cl electrolyte with a high ionic conductivity of 3.15 × 10-3 S cm-1 at room temperature (RT) was obtained by sintering at 550 °C for just 10 min, which was more efficient taking into account such a short preparation time in comparison with other reported methods to synthesize Li6PS5Cl SSEs. All-solid-state lithium sulfur batteries (ASSLSBs) based on the Li6PS5Cl SSE were assembled by using the nano-sulfur/multiwall carbon nanotube composite combined with Li6PS5Cl as the cathode and Li-In alloy as the anode. The cell delivered a high discharge capacity of 1850 mAh g-1 at RT for the first full cycle at 0.176 mA cm-2 (∼0.1C). The discharge capacity was 1393 mAh g-1 after 50 cycles. In addition, the Coulombic efficiency remained nearly 100% during galvanostatic cycling. The experimental data showed that Li6PS5Cl was a good candidate for the SSE used in ASSLSBs.
Original languageEnglish
Pages (from-to)42279-42285
Number of pages7
JournalACS applied materials & interfaces
Volume10
Issue number49
Early online date19 Nov 2018
DOIs
Publication statusPublished - 12 Dec 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

Funding

This work was supported by Basic Science Center Program of National Natural Science Foundation of China (NSFC) under Grant No. 51788104 and NSFC projects under Grant Nos. 51572149, 51532002, 51572141 and 51625202.

Keywords

  • all-solid-state battery
  • argyrodite Li 6 PS 5 Cl
  • lithiuma-sulfur battery
  • solid-state sintering
  • sulfur solid electrolyte

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