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Module-Designed Carbon-Coated Separators for High-Loading, High-Sulfur-Utilization Cathodes in Lithium-Sulfur
Yi-Chen Huang1, Yin-Ju Yen1, Yu-Hsun Tseng1
1Department of Materials Science and Engineering, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan.
Molecules (Basel, Switzerland)
|January 11, 2022
Summary
Carbon-coated separators enhance lithium-sulfur batteries by reducing polysulfide loss and improving reaction kinetics. This boosts performance, showing commercial potential for next-generation energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high theoretical capacity and low cost.
- Challenges include insulating materials and soluble polysulfides, hindering Li-S technology development.
Purpose of the Study:
- To investigate module-designed carbon-coated separators for Li-S batteries.
- To assess how carbon coating characteristics impact cathode performance.
Main Methods:
- Systematic investigation of eight different conductive carbon coatings on polypropylene membranes.
- Evaluation of Li-S cell performance with coated separators under lean-electrolyte conditions.
Main Results:
- Nonporous-carbon-coated separators reduced irreversible polysulfide loss and improved reaction kinetics.
- Achieved peak capacity of 1112 mA∙h g-1 (C/10) and retained 710 mA∙h g-1 after 200 cycles.
- Demonstrated high sulfur loading (4.0 mg cm-2), content (70 wt%), and capacities (4.45 mA∙h cm-2 areal, 778 mA∙h g-1 gravimetric).
Conclusions:
- Carbon-coated separators significantly enhance Li-S battery performance.
- The optimized separator shows practical high specific capacity and commercial potential for advanced energy storage solutions.
