Mesoporous CoSe 2 nanoclusters threaded with nitrogen-doped carbon nanotubes for high-performance sodium-ion battery anodes

Su Hyun Yang, Seung Keun Park, Yun Chan Kang

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Currently, a great challenge to the design of durable sodium-ion batteries (SIBs) is the need for the architecture of nanostructured transition metal-selenide electrodes with high capacity and excellent cycling stability. In this paper, we describe a novel metal-organic framework (MOF)-induced approach to construct necklace-like carbon nanotube (CNT)– CoSe 2 @N-doped carbon (NC) with excellent sodium ion storage performance. In this strategy, CNT-threaded zeolitic imidazolate framework-67 (ZIF-67) polyhedra, synthesized by wet chemical methods, are used as the precursor. During the selenization step, ZIF-67 polyhedra transform into mesoporous nanoclusters consisted of CoSe 2 @NC nanoparticles, forming CNT-CoSe 2 @NC composites with a necklace-like morphology. Such structures facilitate ion and electron transport, and inhibit the aggregation and pulverization of active materials during cycling processes via the intimate contact between the CNTs and CoSe 2 @NC. The as-designed composites show significantly improved electrochemical properties including high discharge capacity (404 mA·h·g −1 after 120 cycles at 0.2 A·g −1 ), excellent rate performance (363 mA·h·g −1 at 5.0 A·g −1 ), and reasonable capacity retention (80% when calculated from the 2nd cycle).

Original languageEnglish
Pages (from-to)1008-1018
Number of pages11
JournalChemical Engineering Journal
DOIs
Publication statusPublished - 2019 Aug 15

Keywords

  • CNT (carbon nanotube)
  • Cobalt selenide
  • Mesoporous
  • Necklace-like structure
  • Sodium-ion battery

ASJC Scopus subject areas

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

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