Interface engineering of metal phosphide on hollow carbons by Dual-template method for High-performance Lithium-sulfur batteries

Junhui Luo, Yang Wang, Yujie Mao, Yu Zhang, Yun Su, Binchun Zou, Shixia Chen, Qiang Deng, Zheling Zeng, Jun Wang, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

Abstract

Tailoring well-dispersed nanoparticles on the sulfur host with high catalytic activity is of great importance yet remains challenging in lithium-sulfur batteries (LSBs). Herein, a novel multi-phase interface structure of embedded CoP and Co2P nanoparticles (CoxP NPs) on hollow N-doped carbon substance (CoxP/NC) was successfully fabricated by the in-situ conversion of ZIF-67@ZIF-8 dual templates. The abundant multi-phase interfaces on CoxP/NC enabled efficient lithium polysulfides (LiPSs) capture, accelerated Li-ion diffusion, and boosted LiPSs conversion, thus forming a rapid and robust “adsorption-diffusion-conversion” network. Moreover, the well-defined hollow carbon polyhedrons physically inhibit the LiPSs diffusion and provide superior conductivity. As a result, the assembled S@CoxP/NC cathode with a high sulfur loading of 82% delivers an excellent rate capability (617.7 mAh g−1 at 3C), impressive stability (a small capacity decay of 0.053% per cycle over 1250 cycles at 1C), and favorable durability of thick sulfur cathodes (with a high areal sulfur loading of 4.68 mg cm2 over 300 cycles).

Original languageEnglish (US)
Article number133549
JournalChemical Engineering Journal
Volume433
DOIs
StatePublished - Apr 1 2022

Keywords

  • Boosted LiPSs conversion
  • Cobalt phosphide
  • Hollow polyhedron
  • Lithium-sulfur batteries
  • Multi-phase interfaces

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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