Open AccessEditors’ Choice—Review—Designing Defects and Diffusion through Substitutions in Metal Halide Solid Electrolytes
Author(s) -
Sinclair Combs,
Paul K. Todd,
Prashun Gorai,
Annalise E. Maughan
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac5bad
Subject(s) - halide , electrolyte , fast ion conductor , electrochemistry , ionic conductivity , ternary operation , ionic bonding , materials science , metal halides , chemical stability , battery (electricity) , ion , chemistry , nanotechnology , inorganic chemistry , thermodynamics , organic chemistry , electrode , computer science , physics , power (physics) , programming language
Ternary metal halides A 3 MX 6 , ( 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 A 3 MX 6 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 A 3 MX 6 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 A 3 MX 6 solid electrolytes and all-solid-state batteries.