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Metal–organic framework derived yolk–shell NiS₂/carbon spheres for lithium–sulfur batteries with enhanced polysulfide redox kinetics
- Tian, Yaxi, Huang, Huawen, Liu, Guoxue, Bi, Ran, Zhang, Lei
- Chemical communications 2019 v.55 no.22 pp. 3243-3246
- active sites, annealing, batteries, cathodes, chemical reactions, coordination polymers
- Yolk–shell NiS₂/carbon spheres (yolk–shell NiS₂/C) have been synthesized by one-step annealing of yolk–shell Ni-metal–organic framework spheres. In particular, both the inner yolk sphere and the outer shell of yolk–shell NiS₂/C can provide catalytically active sites for the redox of polysulfide confined in the yolk–shell structure, providing enhanced redox kinetics. A yolk–shell NiS₂/C–sulfur cathode exhibits a high rate capacity of 569 mA h g⁻¹ at 2C and shows excellent cycling stability, demonstrating the superiority of the yolk–shell structure.