Journal
NANO LETTERS
Volume 22, Issue 21, Pages 8679-8687Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c03279
Keywords
lithium-sulfur batteries; MXenes; CoSe2; sulfur spheres; spherical templating
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Funding
- Agency for Science, Technology and Research (Central Research Fund Award)
- Singapore Ministry of Education academic research grant Tier 2 [MOE2019-T2-1-181]
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Combining MXene nanosheets with CoSe2 nanoparticles can prevent nanosheet aggregation and enhance electrocatalytic effect, leading to improved reaction kinetics and battery performance in lithium-sulfur batteries.
Two-dimensional MXenes produce competitive performances when incorporated into lithium-sulfur batteries (LSBs), solving key problems such as the poor electronic conductivity of sulfur and dissolution of its polysulfide intermediates. However, MXene nanosheets are known to easily aggregate and restack during electrode fabrication, filtration, or water removal, limiting their practical applicability. Furthermore, in complex electrocatalytic reactions like the multistep sulfur reduction process in LSBs, MXene alone is insufficient to ensure an optimal reaction pathway. In this work, we demonstrate for the first time a loose templating of sulfur spheres using Ti3C2Tx MXene nanosheets decorated with polymorphic CoSe2 nanoparticles. This work shows that the templating of sulfur spheres using nanoparticle-decorated MXene nanosheets can prevent nanosheet aggregation and exert a strong electrocatalytic effect, thereby enabling improved reaction kinetics and battery performance. The S@MXene-CoSe2 cathode demonstrated a long cycle life of 1000 cycles and a low capacity decay rate of 0.06% per cycle in LSBs.
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