Anode-Free Lithium–Sulfur Cells Enabled by Rationally Tuning Lithium Polysulfide Molecules
Journal Article
·
· Angewandte Chemie (International Edition)
- Univ. of Texas, Austin, TX (United States); OSTI
- Univ. of Texas, Austin, TX (United States)
The two major barriers of practical lithium–sulfur batteries are the poor reversibility of lithium-metal anode and sluggish kinetics of sulfur cathode. Here, we report a simple yet cogent, molecular tailoring approach for lithium polysulfides, enabling a synergistic enhancement of anode reversibility and cathode kinetics. In this study, we show that SnI4 coordinates with lithium polysulfides to form soluble complexes, resulting in a Li2SnS3-rich anode interphase layer. As Li2SnS3 is stable against parasitic reactions and has a lower ionic resistance over cycling, the Li plating/stripping efficiency is greatly improved. In addition, the formation of soluble complexes between SnI4 and lithium polysulfides play a non-negligible role in suppressing the clustering behavior of lithium polysulfide molecules, resulting in a significant enhancement in sulfur conversion kinetics under lean electrolyte conditions. The synergistic improvement is validated in anode-free, lean-electrolyte pouch cells with a Li2S cathode that displays capacity retention of 78 % after 100 cycles.
- Research Organization:
- Univ. of Texas, Austin, TX (United States); University of Texas, Austin, TX (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)
- Grant/Contract Number:
- EE0007762
- OSTI ID:
- 1976284
- Alternate ID(s):
- OSTI ID: 1882752
OSTI ID: 2217438
- Journal Information:
- Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 35 Vol. 61; ISSN 1433-7851
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Anode‐Free Lithium–Sulfur Cells Enabled by Rationally Tuning Lithium Polysulfide Molecules
Journal Article
·
Wed Jul 20 20:00:00 EDT 2022
· Angewandte Chemie
·
OSTI ID:1877306