Nickel-cobalt Cyclo-tetraphosphate decorated hollow carbon nanocages as effective polysulfide promoters for stable Lithium-Sulfur batteries

Junhui Luo, Yi Liu, He Xiao, Yang Wang, Yujie Mao, Yu Zhang, Yun Su, Yongtao Xia, Shixia Chen, Qiang Deng, Zheling Zeng, Shuguang Deng, Jun Wang

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Lithium-sulfur batteries (LSBs) are promising next-generation energy storage systems. The construction of high-efficiency electrocatalysts to overcome the barriers of sluggish lithium polysulfides (LiPSs) conversion and shuttle effect is urgent. Herein, nickel–cobalt cyclo-tetraphosphate (NiCoP4O12) nanoparticles embedded in hollow carbon polyhedrons are elaborately prepared and used as excellent polysulfide promoters in LSBs. The well-controlled core–shell structure physically blocks and strongly captures LiPSs, thereby boosting LiPSs conversion kinetics over the large exposed NiCoP4O12 active sites. Meanwhile, the carbon matrix build a conductive network that enables high-speed electron and ion transport, thus forming a rapid and robust “capture-diffusion-transformation” network. As a result, the assembled S@NiCoP4O12 cathode delivers an excellent rate capacity (518.7 mAh g−1 at 5 C), impressive stability (a small capacity decay of 0.0396 % per cycle over 1500 cycles at 1 C), and favorable durability of thick sulfur cathodes under lean electrolyte condition (with 4.13 mg cm−2 sulfur loading and 5.0 µL mg−1 electrolyte) over 120 cycles.

Original languageEnglish (US)
Article number138677
JournalChemical Engineering Journal
Volume451
DOIs
StatePublished - Jan 1 2023

Keywords

  • Cyclo-tetraphosphate
  • Hollow polyhedron
  • LiPSs conversion
  • Lithium-sulfur batteries

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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