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

Hyunwon Chu, Hyungjun Noh, Yun-Jung Kim, Seongmin Yuk, Ju-Hyuk Lee, Jinhong Lee, Hobeom Kwack, YunKyoung Kim, Doo-Kyung Yang and Hee-Tak Kim ()
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Hyunwon Chu: Korea Advanced Institute of Science and Technology
Hyungjun Noh: Korea Advanced Institute of Science and Technology
Yun-Jung Kim: Korea Advanced Institute of Science and Technology
Seongmin Yuk: Korea Advanced Institute of Science and Technology
Ju-Hyuk Lee: Korea Advanced Institute of Science and Technology
Jinhong Lee: Korea Advanced Institute of Science and Technology
Hobeom Kwack: Korea Advanced Institute of Science and Technology
YunKyoung Kim: LG Science park E6 Block
Doo-Kyung Yang: LG Science park E6 Block
Hee-Tak Kim: Korea Advanced Institute of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract 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 ~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 4 mA 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.

Date: 2019
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DOI: 10.1038/s41467-018-07975-4

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