Origin of Superionic Li<sub>3</sub>Y<sub>1-<i>x</i></sub>In<sub><i>x</i></sub>Cl<sub>6</sub> Halide Solid Electrolytes with High Humidity Tolerance.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 32406692.
- Also identified by DOI 10.1021/acs.nanolett.0c01156.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The high ionic conductivity, air/humidity tolerance, and related chemistry of Li<sub>3</sub>MX<sub>6</sub> solid-state electrolytes (SSEs, M is a metal element, and X is a halogen) has recently gained significant interest. However, most of the halide SSEs suffer from irreversible chemical degradation when exposed to a humid atmosphere, which originates from hydrolysis. Herein, the function of the M atom in Li<sub>3</sub>MX<sub>6</sub> was clarified by a series of Li<sub>3</sub>Y<sub>1-<i>x</i></sub>In<sub><i>x</i></sub>Cl<sub>6</sub> (0 ≤ <i>x</i> < 1). When the ratio of In<sup>3+</sup> was increased, a gradual structural conversion from the hexagonal-closed-packed (hcp) anion arrangement to cubic-closed-packed (ccp) anion arrangement has been traced. Compared to hcp anion sublattice, the Li<sub>3</sub>MX<sub>6</sub> with ccp anion sublattice reveals faster Li<sup>+</sup> migration. The tolerance of Li<sub>3</sub>Y<sub>1-<i>x</i></sub>In<sub><i>x</i></sub>Cl<sub>6</sub> towards humidity is highly improved when the In<sup>3+</sup> content is high enough due to the formation of hydrated intermediates. The correlations among composition, structure, Li<sup>+</sup> migration, and humidity stability presented in this work provide insights for designing new halide-based SSEs.