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- Title
Dual-Functional Electrolyte Additive for Lithium–Sulfur Batteries Limits Lithium Dendrite Formation and Increases Sulfur Utilization Rate.
- Authors
Liu, Chang; Wu, Huiyuan; Wu, Jiachun; Xiao, Yinglin; Deng, Yonghong
- Abstract
Lithium–sulfur batteries (LSBs) have received great attention as promising candidates for next-generation energy-storage systems due to their high theoretical energy density. However, their practical energy density is limited by a large electrolyte-to-sulfur (E/S) ratio (>10 µL electrolyte/mg s), and their cycle performance encounters challenges from electrode passivation and Li dendrite formation. In this work, a dual-functional electrolyte additive of tetraethylammonium nitrate (TEAN) is presented to address these issues. NO3− as a high-donor-number (DN) salt anion can promote polysulfide dissolution, increase sulfur utilization, and alleviate electrode passivation. The tetraethylammonium cation can adsorb around Li protrusions to form a lithiophobic protective layer to inhibit the formation of Li dendrites. TEAN LSBs show improving capacity, cycling stability, and higher coulombic efficiency under lean electrolyte (5 μL electrolyte/mg s) conditions.
- Subjects
LITHIUM sulfur batteries; LITHIUM cells; DENDRITIC crystals; POLYSULFIDES; ELECTROLYTES; ENERGY density
- Publication
Batteries, 2023, Vol 9, Issue 9, p444
- ISSN
2313-0105
- Publication type
Article
- DOI
10.3390/batteries9090444