A Graphene-like Oxygenated Carbon Nitride Material for Improved Cycle-Life Lithium/Sulfur Batteries

J. Liu, W. Li, L. Duan, X. Li, L. Ji, Z. Geng, K. Huang, L. Lu, L. Zhou, Z. Liu, Wei Chen, L. Liu, S. Feng, Y. Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

279 Citations (Scopus)

Abstract

© 2015 American Chemical Society. Novel sulfur (S) anchoring materials and the corresponding mechanisms for suppressing capacity fading are urgently needed to advance the performance of Li/S batteries. Here, we designed and synthesized a graphene-like oxygenated carbon nitride (OCN) host material that contains tens of micrometer scaled two-dimensional (2D) rippled sheets, micromesopores, and oxygen heteroatoms. N content can reach as high as 20.49 wt %. A sustainable approach of one-step self-supporting solid-state pyrolysis (OSSP) was developed for the low-cost and large-scale production of OCN. The urea in solid sources not only provides self-supporting atmospheres but also produces graphitic carbon nitride (g-C<inf>3</inf>N<inf>4</inf>) working as 2D layered templates. The S/OCN cathode can deliver a high specific capacity of 1407.6 mA h g<sup>-1</sup> at C/20 rate with 84% S utilization and retain improved reversible capacity during long-term cycles at high current density. The increasing micropores, graphitic N, ether, and carboxylic O at the large sized OCN sheet favor S utilization and trapping for polysulfides.
Original languageEnglish
Pages (from-to)5137-5142
Number of pages6
JournalNano Letters
Volume15
Issue number8
DOIs
Publication statusPublished - 12 Aug 2015
Externally publishedYes

Keywords

  • cycle life
  • lithium/sulfur batteries
  • Oxygenated carbon nitride (OCN)
  • sulfur host

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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