Electrochemical properties of cobalt sulfide-carbon composite powders prepared by simple sulfidation process of spray-dried precursor powders

Jung Hyun Kim, Jong Heun Lee, Yun Chan Kang

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Cobalt sulfide-carbon composite powders were prepared by sulfidation of precursor powders obtained by spray drying. The precursor powders were composed of large particles with dimensions of several tens of micrometers and a hollow morphology with a thin-walled structure. The XRD pattern of the powders sulfidated at 200 °C showed Co9S8 as the main phase and CoS as the minor phase. However, the XRD patterns of the powders sulfidated at 300 and 400°C showed CoS as the main phase and Co9S 8, Co3S4, and CoS2 as the minor phases. The primary particle sizes of the powders sulfidated at 200, 300, and 400°C were 80, 190, and 230 nm, respectively. Ultrafine cobalt sulfide crystals, a few nanometers in size, were uniformly distributed across the cobalt sulfide-carbon composite sheet. Dot-mapping images revealed that the carbon component was uniformly distributed throughout the composite powder. The optimum sulfidation temperature to obtain the composite powders with superior electrochemical properties was 300°C. The initial discharge and charge capacities of the composite powders sulfidated at 300°C at a current density of 1000 mA g-1 were 1089 and 878 mA h g-1, respectively. The discharge capacity of the composite powders sulfidated at 300°C became stable at around 790 mA h g-1 for up to 70 cycles.

Original languageEnglish
Pages (from-to)336-343
Number of pages8
JournalElectrochimica Acta
Volume137
DOIs
Publication statusPublished - 2014 Aug 10

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Electrochemical properties
Powders
Cobalt
Carbon
Composite materials
Sulfides
cobaltous sulfide
Thin walled structures
Spray drying
Current density
Particle size
Crystals

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

Cite this

Electrochemical properties of cobalt sulfide-carbon composite powders prepared by simple sulfidation process of spray-dried precursor powders. / Kim, Jung Hyun; Lee, Jong Heun; Kang, Yun Chan.

In: Electrochimica Acta, Vol. 137, 10.08.2014, p. 336-343.

Research output: Contribution to journalArticle

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