Fiber-in-Tube Design of Co 9 S 8 -Carbon/Co 9 S 8: Enabling Efficient Sodium Storage

Xiaoyan Li, Kaikai Li, Sicong Zhu, Ke Fan, Linlong Lyu, Haimin Yao, Yiyang Li, Jinlian Hu, Haitao Huang, Yiu Wing Mai, John B. Goodenough

Research output: Journal article publicationJournal articleAcademic researchpeer-review

134 Citations (Scopus)


The sodium-ion battery is a promising battery technology owing to its low price and high abundance of sodium. However, the sluggish kinetics of sodium ion makes it hard to achieve high-rate performance, therefore impairing the power density. In this work, a fiber-in-tube Co 9 S 8 -carbon(C)/Co 9 S 8 is designed with fast sodiation kinetics. The experimental and simulation analysis show that the dominating capacitance mechanism for the high Na-ion storage performance is due to abundant grain boundaries, three exposed layer interfaces, and carbon wiring in the design. As a result, the fiber-in-tube hybrid anode shows a high specific capacity of 616 mAh g −1 after 150 cycles at 0.5 A g −1 . At 1 A g −1 , a capacity of ca. 451 mAh g −1 can be achieved after 500 cycles. More importantly, a high energy density of 779 Wh kg −1 and power density of 7793 W kg −1 can be obtained simultaneously.

Original languageEnglish
Pages (from-to)6239-6243
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number19
Publication statusPublished - 6 May 2019


  • anodes
  • Co S -carbon/Co S
  • grain boundaries
  • pseudocapacitance
  • sodium-ion batteries

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry


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