Experimental Corroboration of Lithium Orthothioborate Superionic Conductor by Systematic Elemental Manipulation.
basic_science · Level V
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- Record sourced from PubMed, PMID 37943577.
- Also identified by DOI 10.1021/acs.nanolett.3c02861.
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Abstract
The Li superionic conductor Li<sub>3</sub>BS<sub>3</sub> has been theoretically predicted as an ideal solid electrolyte (SE) due to its low Li<sup>+</sup> migration energy barrier and high ionic conductivity. However, the experimentally synthesized Li<sub>3</sub>BS<sub>3</sub> has a 10<sup>4</sup> times lower ionic conductivity. Herein, we investigate the effect of a series of cation and anion substitutions in Li<sub>3</sub>BS<sub>3</sub> SE on its ionic conductivity, including Li<sub>3-<i>x</i></sub>M<sub>0.05</sub>BS<sub>3</sub> (M = Cu, Zn, Sn, P, W, <i>x</i> = 0.05, 0.1, 0.2, 0.25), Li<sub>3-<i>y</i></sub>BS<sub>2.95</sub>X<sub>0.05</sub> (X = O, Cl, Br, I, <i>y</i> = 0.05, 0.1) and Li<sub>2.75-<i>x</i></sub>P<sub>0.05</sub>BS<sub>3-<i>x</i></sub>Cl<sub><i>x</i></sub> (<i>x</i> = 0.05, 0.1, 0.15, 0.2, 0.4, 0.6). Amorphous ionic conductor Li<sub>2.55</sub>P<sub>0.05</sub>BS<sub>2.8</sub>Cl<sub>0.2</sub> has a high ion conductivity of 0.52 mS cm<sup>-1</sup> at room temperature with an activation energy of 0.41 eV. The electrochemical performance of all-solid-state batteries with Li<sub>2.55</sub>P<sub>0.05</sub>BS<sub>2.8</sub>Cl<sub>0.2</sub> SEs show stable cycling with a discharge capacity retention of >97% after 200 cycles at 1<i>C</i> under 55 °C.