Designing Defects and Diffusion through Substitutions in Metal Halide Solid Electrolytes: Article No. 040551

Sinclair Combs, Paul Todd, Prashun Gorai, Annalise Maughan

Research output: Contribution to journalArticlepeer-review

26 Scopus Citations

Abstract

Ternary metal halides A3MX6, (A = Li+, Na+; M = trivalent metal; X = halide) are a promising family of solid electrolytes for potential applications in all-solid-state batteries. Recent research efforts have demonstrated that chemical substitution at all three sites is an effective strategy to controlling battery-relevant material properties. The A3MX6 family exhibits a wide breadth of structure and anion sublattice types, making it worthwhile to comprehend how chemical substitutions manifest desirable functional properties including ion transport, electrochemical stability, and environmental tolerance. Yet, a cohesive understanding of the materials design principles for these substitutions have not yet been developed. Here, we bring together prior literature focused on chemical substitutions in the A3MX6 ternary metal halide solid electrolytes. Using materials chemistry perspectives and principles, we aim to provide insights into the relationships between crystal structure, choice of substituting ions and the extent of substitutions, ionic conductivity, and electrochemical stability. We further present targeted approaches to future substitution studies to enable transformative advances in A3MX6 solid electrolytes and all-solid-state batteries.
Original languageAmerican English
Number of pages13
JournalJournal of the Electrochemical Society
Volume169
Issue number4
DOIs
StatePublished - 2022

NREL Publication Number

  • NREL/JA-5K00-83157

Keywords

  • batteries
  • energy storage
  • solid-state ionics

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