Uniform yolk-shell iron sulfide-carbon nanospheres for superior sodium-iron sulfide batteries

Yun-Xiao Wang, Jianping Yang, Shulei Chou, Hua Kun Liu, Wei-xian Zhang, Dongyuan Zhao, Shi Xue Dou

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273 Citations (Scopus)

Abstract

Sodium–metal sulfide battery holds great promise for sustainable and cost-effective applications. Nevertheless, achieving high capacity and cycling stability remains a great challenge. Here, uniform yolk-shell iron sulfide–carbon nanospheres have been synthesized as cathode materials for the emerging sodium sulfide battery to achieve remarkable capacity of ∼545 mA h g−1 over 100 cycles at 0.2 C (100 mA g−1), delivering ultrahigh energy density of ∼438 Wh kg−1. The proven conversion reaction between sodium and iron sulfide results in high capacity but severe volume changes. Nanostructural design, including of nanosized iron sulfide yolks (∼170 nm) with porous carbon shells (∼30 nm) and extra void space (∼20 nm) in between, has been used to achieve excellent cycling performance without sacrificing capacity. This sustainable sodium–iron sulfide battery is a promising candidate for stationary energy storage. Furthermore, this spatially confined sulfuration strategy offers a general method for other yolk-shell metal sulfide–carbon composites.
Original languageEnglish
Article number8689
Number of pages9
JournalNature Communications
Volume6
DOIs
Publication statusPublished - 28 Oct 2015
Externally publishedYes

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