Trimodally porous N-doped carbon frameworks with an interconnected pore structure as selenium immobilizers for high-performance Li-Se batteries

Seung Keun Park, Jin Sung Park, Yun Chan Kang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Modulating the pore structure of cathode hosts is necessary to achieve high-performance Li-Se batteries with long-term cycling stability and superior rate capability. In this study, we demonstrate a novel strategy for the fabrication of trimodally porous N-doped carbon frameworks with an interconnected network as efficient cathode hosts for Li-Se batteries. This strategy utilizes the carbonization of SiO 2 /polyvinylpyrrolidone/Zn-based metal-organic framework mixtures and subsequent chemical etching of SiO 2 . During the carbonization process, the strong interaction between polyvinylpyrrolidone and metal-organic framework polyhedrons modulates the pore structures of the carbon hosts, leading to the formation of mesoporous carbon cages with microporous shell in the structures, rather than microporous polyhedra. In addition, SiO 2 etching forms a macroporous “inverse opal” structure. This unique trimodal pore structure provides ample space for loading Se into the small-size pores and facilitates penetration of the electrolyte deep inside the cathode through the large-size pores. Thus, the Se-containing trimodally porous N-doped carbon frameworks deliver high discharge capacities (529 and 463 mA h g −1 at the 2nd and 300th cycle, respectively, at 0.5C) and exhibit excellent rate capability (235 mA h g −1 at 10.0C).

Original languageEnglish
Pages (from-to)590-601
Number of pages12
JournalMaterials Characterization
Volume151
DOIs
Publication statusPublished - 2019 May 1

Keywords

  • Hierarchically porous materials
  • Lithium-selenium batteries
  • Metal-organic framework
  • N-doped carbon

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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