Stabilization of superionic-conducting high-temperature phase of Li(CB9H10) via solid solution formation with Li2(B12H12)

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Abstract

We report the stabilization of the high-temperature (high-T) phase of lithium carba-closodecaborate, Li(CB9H10), via the formation of solid solutions in a Li(CB9H10)-Li2(B12H12) quasi-binary system. Li(CB9H10)-based solid solutions in which [CB9H10]- is replaced by [B12H12]2- were obtained at compositions with low x values in the (1-x)Li(CB9H10)-xLi2(B12H12) system. An increase in the extent of [B12H12]2- substitution promoted stabilization of the high-T phase of Li(CB9H10), resulting in an increase in the lithium-ion conductivity. Superionic conductivities of over 10-3 S cm-1 were achieved for the compounds with 0.2 ≤ x ≤ 0.4. In addition, a comparison of the Li(CB9H10)-Li2(B12H12) system and the Li(CB9H10)-Li(CB11H12) system suggests that the valence of the complex anions plays an important role in the ionic conduction. In battery tests, an all-solid-state Li-TiS2 cell employing 0.6Li(CB9H10)-0.4Li2(B12H12) (x = 0.4) as a solid electrolyte presented reversible battery reactions during repeated discharge-charge cycles. The current study offers an insight into strategies to develop complex hydride solid electrolytes.

Original languageEnglish
Article number330
JournalCrystals
Volume11
Issue number4
DOIs
Publication statusPublished - 2021 Apr

Keywords

  • All-solid-state battery
  • Complex hydride
  • High-temperature phase
  • Phase transition
  • Solid electrolyte
  • Supoerionic conductor

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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