Investigation of the suppression of dendritic lithium growth with a lithium-iodide-containing solid electrolyte

Masakuni Takahashi, Toshiki Watanabe, Kentaro Yamamoto, Koji Ohara, Atsushi Sakuda, Takuya Kimura, Seunghoon Yang, Koji Nakanishi, Tomoki Uchiyama, Masao Kimura, Akitoshi Hayashi, Masahiro Tatsumisago, Yoshiharu Uchimoto

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


All-solid-state lithium batteries that use lithium metal as the anode have extremely high energy densities. However, for lithium metal anodes to be used, lithium dendrite formation must be addressed. Recently, the addition of lithium iodide (LiI) to sulfide solid electrolytes was found to suppress lithium dendrite formation. It is unclear whether the cause of this suppression is the improvement of the ionic conductivity of the solid electrolyte itself or the electrochemical properties of the lithium metal/solid electrolyte interface. In this study, the cause of the suppression was quantitatively elucidated. The effect of the interphase on the dendrite growth of doping LiI into Li3PS4 was determined using X-ray absorption spectroscopy and X-ray computed tomography measurements. The results revealed that LiI-doped Li3PS4 suppressed the dendrite formation by maintaining the interface due to inhibition of the reductive decomposition of Li3PS4. In addition, annealed LiI-doped Li3PS4 showed a greater dendrite suppression ability as the ionic conductivity increased. From these results, we not only found that the physical properties of the lithium metal/solid electrolyte interface and the bulk ionic conductivity contribute to lithium dendrite suppression but also quantitatively determined the proportions of the contributions of these two factors.

Original languageEnglish
Pages (from-to)4907-4914
Number of pages8
JournalChemistry of Materials
Issue number13
Publication statusPublished - Jul 13 2021
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry


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