Fast Li-ion Conductor of Li<sub>3</sub>HoBr<sub>6</sub> for Stable All-Solid-State Lithium-Sulfur Battery.
basic_science · Level V
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- Record sourced from PubMed, PMID 34677073.
- Also identified by DOI 10.1021/acs.nanolett.1c03573.
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Abstract
Rare-earth (RE) solid-state halide electrolytes have been extensively studied recently in the field of lithium (Li) ion all-solid-state batteries (ASSBs) due to their excellent electrochemical performances. Herein, a new RE-based solid halide electrolyte Li<sub>3</sub>HoBr<sub>6</sub> (LHB) has been synthesized and exhibits high Li ion conductivity up to mS cm<sup>-1</sup> at room temperature. Theoretical calculations have identified four different Li ion migration pathways, in which the out-of-plane pathways are much more favorable than the direct in-plane pathways. In addition, LHB has a wider electrochemical window in comparison to a sulfide solid electrolyte and good deformability. The LHB-based Li-sulfur ASSB assembled by cold pressing can exhibit good cycling stability with high Coulombic efficiency, which shows that LHB has potential application in ASSBs.