Studies on the inhibition of lithium dendrite formation in sulfide solid electrolytes doped with LiX (X = Br, I)

Seunghoon Yang, Masakuni Takahashi, Kentaro Yamamoto, Koji Ohara, Toshiki Watanabe, Tomoki Uchiyama, Tsuyoshi Takami, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago, Yoshiharu Uchimoto

Research output: Contribution to journalArticlepeer-review

Abstract

A promising method to increase the energy density of all-solid-state batteries (ASSBs) featuring lithium ions as carriers is to employ Li metal as the anode. However, this has been accompanied by safety problems like flammable accidents associated with lithium dendrites originating from reactions with the solid electrolyte, leading to reduced battery performance. To overcome this issue toward the commercialization of ASSBs, various approaches have been proposed by many researchers. Among the suggested solutions, the use of lithium-halide-doped Li3PS4, to suppress lithium dendrite formation, has attracted attention. LiI-doped Li3PS4 has shown the highest lithium dendrite growth suppression among lithium-halide-doped systems, but the reason for this is unclear. Thus, we attempted to clarify the cause of this suppression by comparing LiBr-doped Li3PS4 with LiI-doped Li3PS4. Investigation using various methods such as electrochemical evaluation, X-ray absorption spectroscopy, X-ray computed tomography, and pair distribution function analysis revealed that two factors affect the suppression of Li dendrite growth: the suppression of the current density distribution by improving the ionic conductivity and the stable interfacial layer. This is the main reason LiI-doped Li3PS4 shows excellent Li dendrite suppression.

Original languageEnglish
Article number115869
JournalSolid State Ionics
Volume377
DOIs
Publication statusPublished - Apr 2022
Externally publishedYes

Keywords

  • All solid–state battery
  • Lithium dendrite
  • Lithium halide
  • Sulfide solid electrolyte

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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