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SAKURAJUN
Austria
Messaggi 31 |
 Spedito - 28/12/2020 : 07:41:20
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Confinement of sulfur in the micropores of honeycomb-like carbon derived from lignin for lithium-sulfur battery cathode[url=https://www.wyactivatedcarbon.com/]www.wyactivatedcarbon.com[/url]
Nitrogen-incorporated honeycomb-like nanoporous carbons (n-hC) are synthesized through the hydrothermal carbonization of a lignin precursor, subsequent KOH activation, and a post-doping process. The as-obtained n-hC exhibits a large surface area (2071#8239;m2#8239;g#8722;1) and pore volume (1.11#8239;cm3#8239;g#8722;1) and a high N content (3.47%). The n-hC is used as an S-hosting material with a mass loading of 64.1#8239;wt% (S@n-hC) through the in situ redox reaction of Na2S2O3. The S@n-hC achieves a high initial discharge capacity of 1295.5#8239;mAh#8239;g#8722;1 at 0.1C and retains 647.2#8239;mAh#8239;g#8722;1 after 600 cycles, and shows excellent cycling stability (with the capacity fading of 0.05% per cycle over 900 cycles at 1C). The strong confinement of S in the N-incorporated micropores leads to the electrochemical and thermal stabilization of S, providing different redox environments. The facile and reversible redox kinetics of the S@n-hC are confirmed by deriving the lowest exchange current density and redox charge-transfer resistance from Tafel and Nyquist plots and through the prominent redox and charge/discharge profiles. The improved performance of the S@n-hC is attributed to the S confinement in the micropores,[url=https://www.wyactivatedcarbon.com/products/other-activated-carbon/honeycomb-activated-carbon.html]honeycomb activated carbon[/url]the honeycomb-like hierarchical structure, and the N incorporation for the inhibition of polysulfide dissolution and the efficient utilization of S.
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Confinement of honeycomb-like carbon
