Rational Construction of Sulfur-Deficient NiCo2S4- xHollow Microspheres as an Effective Polysulfide Immobilizer toward High-Performance Lithium/Sulfur Batteries

Wenjuan Wang, Jing Li, Qianwen Jin, Yanyu Liu, Yongguang Zhang, Yan Zhao, Xin Wang, Arailym Nurpeissova, Zhumabay Bakenov

Research output: Contribution to journalArticlepeer-review

Abstract

The synergistic strategy combining architectural design with defect engineering in transition-metal sulfides offers a promising opportunity to realize high-efficiency polysulfide adsorption/conversion surface catalysis in lithium/sulfur (Li/S) batteries. Here, defect-rich yolk-shell hollow spheres composed of ultrafine NiCo2S4-x nanoparticles as sulfur hosts prepared by an anion-exchange method are reported. The elaborate design of sulfur defects endows the NiCo2S4-x hollow spheres with significantly enhanced electronic conductivity and superior affinity for polysulfides as well as expedited sulfur conversion. Meanwhile, the unique yolk-shell NiCo2S4-x hollow sphere structure provides large cavities that not only increase sulfur storage but also relieve the electrode volume expansion during cycling. Combining these favorable features, the NiCo2S4-x-hosted sulfur cathode revealed enhanced cycling stability, corresponding to a negligible capacity fading rate of 0.0754% per cycle after 500 cycles at 1 C, and achieved an outstanding rate capability (628.9 mAh g-1 up to 5 C).

Original languageEnglish
Pages (from-to)1687-1695
Number of pages9
JournalACS Applied Energy Materials
Volume4
Issue number2
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • catalytic effect
  • cathode
  • high conductivity
  • lithium/sulfur batteries
  • sulfur vacancy

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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