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

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

doi:10.1021/acsaem.2c03334

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 journal › Article › peer-review

6 Scopus citations

Abstract

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 language	English
Pages (from-to)	51-57
Number of pages	7
Journal	ACS Applied Energy Materials
Volume	6
Issue number	1
DOIs	https://doi.org/10.1021/acsaem.2c03334
State	Published - 9 Jan 2023

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society.

Funding

This work contributes to the research performed at CELEST (Center for Electrochemical Energy Storage Ulm-Karlsruhe) and was funded by the German Research Foundation under Project ID 01DQ19012A (SELBA).

Funders	Funder number
Center for Electrochemical Energy Storage Ulm-Karlsruhe
Deutsche Forschungsgemeinschaft	01DQ19012A

Keywords

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

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title = "Garnet-Type Lithium Metal Fluorides: A Potential Solid Electrolyte for Solid-State Batteries",

abstract = "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{\textquoteright} 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.",

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author = "Ediga Umeshbabu and Satyanarayana Maddukuri and Doron Aurbach and Maximilian Fichtner and Munnangi, {Anji Reddy}",

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AU - Aurbach, Doron

AU - Fichtner, Maximilian

AU - Munnangi, Anji Reddy

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AB - 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.

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

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