Garnet-Type Lithium Metal Fluorides: A Potential Solid Electrolyte for Solid-State Batteries

Ediga Umeshbabu, Satyanarayana Maddukuri, Doron Aurbach, Maximilian Fichtner, Anji Reddy Munnangi

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


In this work, we introduced a garnet-type lithium metal fluoride, Li3Na3M2F12 (M = Al, Sc, In), as solid-state lithium-ion conductors for the first time. The mechanically milled Li3Na3M2F12 compounds crystallized in a cubic garnet-like structure (Ia3̅d, No. 230). The ionic conductivities of Li3Na3Al2F12, Li3Na3Sc2F12, and Li3Na3In2F12 are 1.7 × 10-6, 8.2 × 10-6, and 2.4 × 10-6 S/cm at 300 °C and 1.2 × 10-10, 2.6 × 10-9, and 1.8 × 10-10 S/cm at 100 °C, respectively. Even though these fluoride garnets’ conductivity is less, it is still better than those of the oxide analogues Li3Ln3Te2O12 (Ln = Er, Gd, Tb, Nd). Moreover, we explored why garnet-type Li3Na3M2F12 has low ionic conductivity and presented strategies for further improving conductivities.

Original languageEnglish
Pages (from-to)51-57
Number of pages7
JournalACS Applied Energy Materials
Issue number1
StatePublished - 9 Jan 2023

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© 2022 American Chemical Society.


  • Garnet-type lithium metal fluorides
  • Ionic conductivity
  • Rietveld refinement
  • Solid electrolytes
  • Solid-state lithium batteries
  • XRD


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