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New High Donor Electrolyte for Lithium-Sulfur Batteries
Cited 91 time in
Web of Science
Cited 94 time in Scopus
- Authors
- Issue Date
- 2020-12
- Citation
- Advanced Materials, Vol.32 No.52, p. 2005022
- 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-3(center dot-)), enables the efficient utilization of sulfur as reflected in the specific capacity of 1595 mAh g(-1) under lean electrolyte conditions of 5 mu L-electrolyte mg(sulfur)(-1). Moreover, the addition of LiNO3 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.
- ISSN
- 0935-9648
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