Abstract
Metal organic framework-derived porous nanofibers were synthesized by electrospinning and subsequent heat treatment process. In this study, ZIF-8 and PS nanobeads were used as templates to form micro and meso pores in the structure. For this, ZIF-8 polyhedra were prepared by liquid-phase methode using 2-methylimidazole and zincnitrate-hexahydrate in ethylalcohol. After facile heat-treatment, ZIF-8, PS, and PVP were thermally decomposed to form pores and carbon matrix composing fiber structure. The porous carbon matrix improves the redox reaction kinetics and provides numerous chemisorption sites for the effective trapping and reuse of lithium polysulfide during cycles. As a result, the assembled Li-S cells employing unique nanostructure display superior rate capability and stable cycling performance. The Li-S cell delivered a stable discharge capacity of 655 mA h g<sup>-1</sup> after 100 charge-discharge cycles at 1.0 C. Thus, the uniquely nanostructured porous carbon fibers shows high potential for the development of advanced Li-S batteries utilizing pure sulfur electrodes with realistic battery parameters.
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