Journal
NANO ENERGY
Volume 85, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.105981
Keywords
Lithium-sulfur batteries; Hollow carbon microspheres; Hierarchically porous shell; Catalytic conversion; High sulfur content; loading
Categories
Funding
- Natural Science Foundation of Hebei Province [B2018203330]
- Postgraduate Innovation Project of Hebei Province [CXZZBS2020060]
- China Scholarship Council [201908130138]
- Australian Research Council (ARC) [DP200101249]
- Australian Research Council [DP200101249] Funding Source: Australian Research Council
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The rational design of cobalt-embedded nitrogen-doped hollow carbon microspheres as a multifunctional sulfur host for lithium-sulfur batteries shows excellent performance in improving the efficiency and cycle life of the batteries. The unique porous architecture and chemical adsorption capabilities contribute to the enhanced electrochemical performances achieved in the batteries.
The shuttle effect of dissolved polysulfides migrating to and depositing on anodes often leads to low round-trip efficiency and short cycle life for lithium-sulfur (Li-S) batteries. Herein, we report the rational design of cobaltembedded nitrogen-doped hollow carbon microspheres (Co@N-HCMSs) as a multifunctional sulfur host for Li-S batteries. The hollow carbon microspheres exhibit large central cavities wrapped by a hierarchically porous shell, showing a large surface area of 1954 m2 g- 1. Furthermore, the carbon shells display a unique porous architecture, in which small pores are scattered on the outside and large pores are inside, thereby functioning as a selection barrier to confine polysulfides and diffuse Li+ simultaneously. Moreover, the highly dispersed cobalt nanoparticles in the porous shell activate the surrounding N-doped carbon layer, which not only promote chemical adsorption of polysulfides but also catalyze polysulfide conversion. This facilitation effect has been confirmed by Bader charge and density function theory (DFT) calculations. When applied in Li-S batteries, the sulfur-impregnated Co@N-HCMSs cathode material exhibits excellent electrochemical performances, especially with a high sulfur content of 90.5 wt% and a high areal sulfur loading of 5.1 mg cm-2.
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