Journal
ACS ENERGY LETTERS
Volume 7, Issue 8, Pages 2459-2468Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.2c00874
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Funding
- Swiss National Science Foundation (SNF) [200021- 188572]
- National Research Foundation of Korea (NRF) [NRF- 2021R1A2B5B03001956]
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MOTIE) of Korea [20012341]
- Institute of Engineering Research (IOER)
- Research Institute of Advanced Materials (RIAM) at Seoul National University
- Swiss National Science Foundation (SNF) [200021_188572] Funding Source: Swiss National Science Foundation (SNF)
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Electrolyte engineering is a promising strategy for improving sulfur utilization and cycle life in lithium-sulfur batteries. By introducing a dual functional high donor electrolyte, 3-FPN, high polysulfide solubility and compatibility with lithium metal are achieved, resulting in high specific capacity and robust cycling performance.
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 g(sulfur)(-1) and robust cycling under a lean electrolyte condition of 7 mu Lelectrolyte mgsulfur-1in 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.
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