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• W3137252352 endingPage "106011" @default.
• W3137252352 startingPage "106011" @default.
• W3137252352 abstract "Abstract Lithium-sulfur (Li-S) batteries have drawn intense attention in the realm of electrochemical energy storage owing to their high theoretical energy density, as well as the natural abundance of sulfur and low cost. However, the severe shutting of polysulfides and sluggish reaction kinetics hinder the practical application of Li-S batteries. To solve these problems, MOF (ZIF-67) derived in-situ N-doped carbon nanocage embedded with CoP (CoP-HNC) as an efficient sulfur host for advanced Li-S batteries is proposed here. With the abundant porosity and cavity, hollow polar heteroatom N-doped carbon architecture can effectively alleviate volume expansion, buffer electrolyte and trap polysulfides. More importantly, the embedded polar CoP nanoparticles acted as an effective electrocatalyst not only anchor polysulfide intermediates, but also promote the redox kinetics toward polysulfides conversion remarkably, which is clearly proved by experimental results and DFT calculations. Benefiting from above advantages, Li-S batteries assembled with CoP-HNC electrode achieve a significantly enhanced sulfur utilization (about 800 mAh g−1 at 5 C), improved cycling stability and ultralow capacity decay rate of 0.02% per cycle after 1000 cycles. Even at high sulfur loading of 3.0 mg cm−2, the S/CoP-HNC electrode still delivers a high initial capacity of 866 mAh g−1 at 0.5 C. This work has guiding synergistically combining desired design and electrocatalysis in sulfur cathode for Li-S batteries." @default.
• W3137252352 created "2021-03-29" @default.
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• W3137252352 date "2021-07-01" @default.
• W3137252352 modified "2023-10-16" @default.
• W3137252352 title "Synergistic regulation of polysulfides immobilization and conversion by MOF-derived CoP-HNC nanocages for high-performance lithium-sulfur batteries" @default.
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• W3137252352 doi "https://doi.org/10.1016/j.nanoen.2021.106011" @default.
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