Journal
NANOSCALE ADVANCES
Volume 5, Issue 2, Pages 471-478Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2na00645f
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In this study, an electro-catalytic strategy was proposed to improve the utilization of sulfur in lithium-sulfur batteries by inhibiting the shuttle of polysulfides through physical absorption and catalysis. The Li-S battery with Co-TCN@PP separator demonstrated superior rate capacities and long cycle life, as well as the ability to achieve high sulfur loading in the electrodes.
The main issue with lithium-sulfur (Li-S) batteries is the serious irreversible capacity loss caused by the polysulfide shuttle process. In this work, we propose an electro-catalytic strategy for absorbing and transferring long-chain polysulfides during the redox process, which is the key to improving the utilization of S. Reported here is a Co doped tubular g-C3N4 (CN) modified separator (Co-TCN@PP), which successfully inhibited the polysulfide shuttle by physical absorption and catalysis, thus facilitating the high utilization of S. Co-TCN with a tube-like structure ensures the uniform dispersion of Co nanoparticles, which provides abundant active sites to absorb polysulfides. Furthermore, Co-TCN exhibits fast reaction kinetics for polysulfide conversion. A Li-S battery with Co-TCN@PP achieves superior rate capacities and a long cycle life (400 times) with capacity fading as low as 0.07% per cycle at a high Li+ insertion/extraction rate of 2C. Moreover, electrodes with a high sulfur loading of 5.6 mg cm(-2) can be realized by adopting the Co-TCN@PP separator.
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