Uniform yolk-shell iron sulfide–carbon nanospheres for superior sodium–iron sulfide batteries
2015; Nature Portfolio; Volume: 6; Issue: 1 Linguagem: Inglês
10.1038/ncomms9689
ISSN2041-1723
AutoresYunxiao Wang, Jianping Yang, Shulei Chou, Huan Liu, Wei‐xian Zhang, Dongyuan Zhao, Shi Xue Dou,
Tópico(s)Advanced battery technologies research
ResumoSodium-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.
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