New High Donor Electrolyte for Lithium-Sulfur Batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33184954.
- Also identified by DOI 10.1002/adma.202005022.
- 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 unparalleled theoretical specific energy of lithium-sulfur (Li-S) batteries has attracted considerable research interest from within the battery community. However, most of the long cycling results attained thus far relies on using a large amount of electrolyte in the cell, which adversely affects the specific energy of Li-S batteries. This shortcoming originates from the low solubility of polysulfides in the electrolyte. Here, 1,3-dimethyl-2-imidazolidinone (DMI) is reported as a new high donor electrolyte for Li-S batteries. The high solubility of polysulfides in DMI and its activation of a new reaction route, which engages the sulfur radical (S<sub>3</sub> <sup>•-</sup> ), enables the efficient utilization of sulfur as reflected in the specific capacity of 1595 mAh g<sup>-1</sup> under lean electrolyte conditions of 5 μL<sub>electrolyte</sub> mg<sub>sulfur</sub> <sup>-1</sup> . Moreover, the addition of LiNO<sub>3</sub> stabilizes the lithium metal interface, thereby elevating the cycling performance to one of the highest known for high donor electrolytes in Li-S cells. These engineered high donor electrolytes are expected to advance Li-S batteries to cover a wide range of practical applications, particularly by incorporating established strategies to realize the reversibility of lithium metal electrodes.