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A bifunctional N-doped carbon nanosheet embedded with VN/Mo2C heterointerfaces electrocatalyst for expediting sulfur redox and lithium regulation toward advanced Li-S battery.
- Source :
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Chemical Engineering Journal . Jun2024, Vol. 489, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
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Abstract
- • VN/Mo 2 C heterointerfaces nanoparticles are monodispersed on N-doped carbon nanosheets. • Mo 2 C and VN synergistically promote the diffusion and conversion of polysulfides. • The functional separator also has excellent protective effect on the lithium anode. • The modified separator exhibits superb electrochemical performance in Li-S batteries. Lithium-sulfur (Li-S) battery is deemed as one of the optimal next-generation energy storage devices due to its low cost and high energy density. However, the shuttle effect of lithium polysulfide (LiPS), sluggish reaction kinetics, and fatal Li-dendrite growth hinder its practical applications. In this work, a bifunctional nitrogen-doped carbon nanosheet conductive framework embedded with VN-Mo 2 C heterointerfaces (VN/Mo 2 C@CNS) is reported as a separator modifier for both sulfur cathode and lithium anode. The VN/Mo 2 C@CNS can offer a synergistic effect of strong surface affinity, good catalytic activity, and small diffusion barrier to accelerate the conversion of polysulfides, which was confirmed by in-situ Raman and theoretical calculation. Moreover, the composite has good lithiophilicity, thus inhibiting the formation of dendrites and achieving uniform lithium deposition. Benefiting from the above merits, the Li-S cells with VN/Mo 2 C@CNS separator obtain desirable rate performance (687 mAh g−1 at 4 C), long cycle life of 1000 cycles (0.042 % capacity attenuation per cycle at 1 C), high areal capacity of 4.2 mAh cm−2 (under a high sulfur loading of 5.6 mg cm−2), and stable performance in protecting the Li anode (at 5 mA cm−2 for 1000 h). This work highlights a novel strategy for facilely designing heterostructures, offering valuable insights to tackle sulfur cathode and lithium anode challenges simultaneously for longevous Li-S batteries. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 489
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 177198915
- Full Text :
- https://doi.org/10.1016/j.cej.2024.151115