Achieving three-dimensional lithium sulfide growth in lithium-sulfur batteries using high-donor-number anions

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Uncontrolled growth of insulating lithium sulfide leads to passivation of sulfur cathodes, which limits high sulfur utilization in lithium-sulfur batteries. Sulfur utilization can be augmented in electrolytes based on solvents with high Gutmann Donor Number; however, violent lithium metal corrosion is a drawback. Here we report that particulate lithium sulfide growth can be achieved using a salt anion with a high donor number, such as bromide or triflate. The use of bromide leads to similar to 95 % sulfur utilization by suppressing electrode passivation. More importantly, the electrolytes with high-donor-number salt anions are notably compatible with lithium metal electrodes. The approach enables a high sulfur-loaded cell with areal capacity higher than 4mA h cm-2 and high sulfur utilization (> 90 %). This work offers a simple but practical strategy to modulate lithium sulfide growth, while conserving stability for high-performance lithium-sulfur batteries.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2019-01
Language
English
Article Type
Article
Citation

NATURE COMMUNICATIONS, v.10

ISSN
2041-1723
DOI
10.1038/s41467-018-07975-4
URI
http://hdl.handle.net/10203/250407
Appears in Collection
CBE-Journal Papers(저널논문)
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