Nitrogen-doped hollow carbon boosting the anchoring of sulfur capacity for high-loading lithium–sulfur batteries
Microporous and Mesoporous Materials(2022)
摘要
As one of the best candidates, lithium sulfur battery (Li–S) is extensively explored due to the high theoretical capacity and abundant sources of sulfur. Carbon-based materials take an important role as a host for sulfur in the cathode. In this paper, a nitrogen-doped hollow carbon for sulfur cathode (NHC–S) with high sulfur loading of 92% is studied for Li–S batteries. The structural characterization demonstrates that the N-doping can improve the graphitization of the hollow carbon material, which increases the electrical conductivity. The catalytic and deposition nucleation tests indicate that the N doping can increase the nucleation rate of Li2S, which is also illustrated by the larger binding energies of Li2S on N-doping substrates than on carbon via density functional theory (DFT) analysis. The initial specific capacity of NHC–S is 864.8 mAh g−1 at the current density of 0.2 C, and 460.8 mAh g−1 after 500 cycles. When the sulfur content loading was up to 2.8 mg cm−2, the electrode material could achieve 85% capacity retention after 100 reversible cycles.
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关键词
Li–S batteries,Sulfur cathode,N-doped,Hollow carbon,Catalytic
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