AI Article Synopsis
- * Researchers have combined two strategies—ion substitution and nanoconfinement—to significantly enhance the ionic conductivity of these hydrides, achieving improvements by factors of 4 to 10 at ambient temperatures.
- * The findings suggest that this effective combination method for increasing conductivity could potentially be applied to other solid-state electrolytes as well.
Article Abstract
Solid-state electrolytes are crucial for the realization of safe and high capacity all-solid-state batteries. Lithium-containing complex hydrides represent a promising class of solid-state electrolytes, but they exhibit low ionic conductivities at room temperature. Ion substitution and nanoconfinement are the main strategies to overcome this challenge. Here, we report on the synthesis of nanoconfined anion-substituted complex hydrides in which the two strategies are effectively combined to achieve a profound increase in the ionic conductivities at ambient temperature. We show that the nanoconfinement of anion substituted LiBH (LiBH-LiI and LiBH-LiNH) leads to an enhancement of the room temperature conductivity by a factor of 4 to 10 compared to nanoconfined LiBH and nonconfined LiBH-LiI and LiBH-LiNH, concomitant with a lowered activation energy of 0.44 eV for Li-ion transport. Our work demonstrates that a combination of partial ion substitution and nanoconfinement is an effective strategy to boost the ionic conductivity of complex hydrides. The strategy could be applicable to other classes of solid-state electrolytes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7011749 | PMC |
| http://dx.doi.org/10.1021/acs.jpcc.9b10607 | DOI Listing |
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