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Construction of Electrocatalytic and Heat-Resistant Self-Supporting Electrodes for High-Performance Lithium-Sulfur Batteries.

ABSTRACT: Boosting the utilization efficiency of sulfur electrodes and suppressing the "shuttle effect" of intermediate polysulfides remain the critical challenge for high-performance lithium-sulfur batteries (LSBs). However, most of reported sulfur electrodes are not competent to realize the fast conversion of polysulfides into insoluble lithium sulfides when applied with high sulfur loading, as well as to mitigate the more serious shuttle effect of polysulfides, especially when worked at an elevated temperature. Herein, we reported a unique structural engineering strategy of crafting a unique hierarchical multifunctional electrode architecture constructed by rooting MOF-derived CoS₂/carbon nanoleaf arrays (CoS₂-CNA) into a nitrogen-rich 3D conductive scaffold (CTNF@CoS₂-CNA) for LSBs. An accelerated electrocatalytic effect and improved polysulfide redox kinetics arising from CoS₂-CNA were investigated. Besides, the strong capillarity effect and chemisorption of CTNF@CoS₂-CNA to polysulfides enable high loading and efficient utilization of sulfur, thus leading to high-performance LIBs performed not only at room temperature but also up to an elevated temperature (55 °C). Even with the ultrahigh sulfur loading of 7.19 mg cm^-2, the CTNF@CoS₂-CNA/S cathode still exhibits high rate capacity at 55 °C.

SUBMITTER: Zhang X

PROVIDER: S-EPMC7770752 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:3D coral-like, nitrogen and sulfur co-doped mesoporous carbon has been synthesized by a facile hydrothermal-nanocasting method to house sulfur for Li-S batteries. The primary doped species (pyridinic-N, pyrrolic-N, thiophenic-S and sulfonic-S) enable this carbon matrix to suppress the diffusion of polysulfides, while the interconnected mesoporous carbon network is favourable for rapid transport of both electrons and lithium ions. Based on the synergistic effect of N, S co-doping and the mesoporous conductive pathway, the as-fabricated C/S cathodes yield excellent cycling stability at a current rate of 4 C (1 C = 1675 mA g(-1)) with only 0.085% capacity decay per cycle for over 250 cycles and ultra-high rate capability (693 mAh g(-1) at 10 C rate). These capabilities have rarely been reported before for Li-S batteries.

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