Multicomponent (Mo, Ni) metal sulfide and selenide microspheres with empty nanovoids as anode materials for Na-ion batteries

Jin Sung Park, Yun Chan Kang

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Unique-structured MoS2-Ni9S8-C, MoSe2-NiSe-C, MoS2-Ni9S8, and MoSe2-NiSe-NiSe2 composite microspheres were prepared by pilot-scale spray drying and a subsequent post-treatment process. Dextrin, used as the carbon source, played a key role in the formation of unique-structured multicomponent metal sulfide and selenide microspheres with and without carbon. The empty nanovoids formed by decomposition (or carbonization) of phase-separated dextrin during the spray drying process were uniformly distributed within the multicomponent metal sulfide and selenide composite microspheres. The discharge capacities of MoS2-Ni9S8-C, MoSe2-NiSe-C, MoS2-Ni9S8, and MoSe2-NiSe-NiSe2 for the 80th cycle at a current density of 0.5 A g-1 for sodium-ion storage were 366, 386, 459, and 291 mA h g-1, respectively, and the respective capacity retentions measured from the second cycle were 91, 102, 92, and 64%. The carbon-free MoS2-Ni9S8 microspheres exhibited excellent rate performance and their discharge capacities decreased slightly from 559 to 428 mA h g-1 as the current densities increased from 0.1 to 3 A g-1. The MoS2-Ni9S8-C composite microspheres, with high structural stability during repeated sodium-ion insertion and deinsertion, showed extremely long-term cycling performance for 1000 cycles.

Original languageEnglish
Pages (from-to)8616-8623
Number of pages8
JournalJournal of Materials Chemistry A
Volume5
Issue number18
DOIs
Publication statusPublished - 2017 Jan 1

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ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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