Synergistic Modulation of Grain Boundary and Domain Boundary Enhances the Ionic Conductivity of Li<sub>0.33</sub>La<sub>0.56</sub>TiO<sub>3</sub> Solid Electrolyte.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40083251.
- Also identified by DOI 10.1021/acsnano.4c15481.
- 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 ABO<sub>3</sub> perovskite oxide solid state electrolyte Li<sub>3<i>x</i></sub>La<sub>2/3-<i>x</i></sub>TiO<sub>3</sub> (LLTO) has gained significant attention. Despite their potential, both the bulk and grain boundary conductivity values observed in practice fall short of theoretical expectations. In terms of structures, domain boundaries and grain boundaries play a crucial role in hindering ionic transport, and there has been no comprehensive study that enhances both the bulk and grain boundary conductivity by modification of these microstructures. Here, we have employed the multiscale method and demonstrated that Ta and Sr codoping strategy balances the structural symmetry, Li<sup>+</sup> concentration, grain boundaries, domain boundaries, and the lattice defects, which simultaneously enhances the bulk and grain boundary conductivity. The highest total ionic conductivity achieved is 3.0 × 10<sup>-4</sup> S cm<sup>-1</sup> in the Li<sub>0.33</sub>La<sub>0.54</sub>Sr<sub>0.03</sub>Ti<sub>0.9625</sub>Ta<sub>0.03</sub>O<sub>3</sub> sample, with an 280% enhancement over the pristine sample. Our work highlights the coupling effects of domain and grain boundaries for further improving the ionic conductivity of perovskite solid state electrolyte.