Pseudo-ternary LiBH4·LiCl·P2S5system as structurally disordered bulk electrolyte for all-solid-state lithium batteries

Abdelouahab El Kharbachi, Julia Wind, Amund Ruud, Astrid B. Høgset, Magnus M. Nygård, Junxian Zhang, Magnus H. Sørby, Sangryun Kim, Fermin Cuevas, Shin Ichi Orimo, Maximilian Fichtner, Michel Latroche, Helmer Fjellvåg, Bjørn C. Hauback

Research output: Contribution to journalArticle

Abstract

The properties of the mixed system LiBH4-LiCl-P2S5 are studied with respect to all-solid-state batteries. The studied material undergoes an amorphization upon heating above 60 °C, accompanied with increased Li+ conductivity beneficial for battery electrolyte applications. The measured ionic conductivity is ∼10-3 S cm-1 at room temperature with an activation energy of 0.40(2) eV after amorphization. Structural analysis and characterization of the material suggest that BH4 groups and PS4 may belong to the same molecular structure, where Cl ions interplay to accommodate the structural unit. Thanks to its conductivity, ductility and electrochemical stability (up to 5 V, Au vs. Li+/Li), this new electrolyte is successfully tested in battery cells operated with a cathode material (layered TiS2, theo. capacity 239 mA h g-1) and Li anode resulting in 93% capacity retention (10 cycles) and notable cycling stability under the current density ∼12 mA g-1 (0.05C-rate) at 50 °C. Further advanced characterisation by means of operando synchrotron X-ray diffraction in transmission mode contributes explicitly to a better understanding of the (de)lithiation processes of solid-state battery electrodes operated at moderate temperatures.

Original languageEnglish
Pages (from-to)13872-13879
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume22
Issue number25
DOIs
Publication statusPublished - 2020 Jul 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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    El Kharbachi, A., Wind, J., Ruud, A., Høgset, A. B., Nygård, M. M., Zhang, J., Sørby, M. H., Kim, S., Cuevas, F., Orimo, S. I., Fichtner, M., Latroche, M., Fjellvåg, H., & Hauback, B. C. (2020). Pseudo-ternary LiBH4·LiCl·P2S5system as structurally disordered bulk electrolyte for all-solid-state lithium batteries. Physical Chemistry Chemical Physics, 22(25), 13872-13879. https://doi.org/10.1039/d0cp01334j