Journal article

Dual Functional High Donor Electrolytes for Lithium–Sulfur Batteries under Lithium Nitrate Free and Lean Electrolyte Conditions

DOKPE

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  • 2022
Published in:
  • ACS Energy Letters. - American Chemical Society (ACS). - 2022, vol. 7, no. 8, p. 2459-2468
English Electrolyte engineering is a highly promising strategy in lithium−sulfur
batteries to increase the sulfur utilization and maintain a stable interface at the lithium
metal anode for long-term cycling. Whereas high donor electrolytes can increase the
solubility of polysulfides to promote the sulfur utilization and therefore operate under
lean electrolyte conditions, their poor thermodynamic stability toward lithium metal
anode causes uncontrolled decomposition at its interface and impair the cycle life
severely. Here, we introduce a dual functional high donor electrolyte, 3-fluoropyridine
(3-FPN), to simultaneously achieve high polysulfide solubility up to 1.5 M and
compatibility with lithium metal. These features result in a high specific capacity of
1087.9 mAh gsulfur−1 and robust cycling under a lean electrolyte condition of 7
μLelectrolyte mgsulfur−1 in the absence of LiNO3. Remarkably, 3-FPN preserves stable
cyclability even at a high areal sulfur loading of 8 mgsulfur cm−2, which opens a new
avenue in advancing the electrolytes for lithium−sulfur batteries toward their high
volumetric energy density and long cycle life.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie
Language
  • English
Classification
Chemistry
License
CC BY-NC
Open access status
green
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/322244
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