One-Pot Synthesis of CoSex-rGO Composite Powders by Spray Pyrolysis and Their Application as Anode Material for Sodium-Ion Batteries

Gi Dae Park, Yun Chan Kang

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

A simple one-pot synthesis of metal selenide/reduced graphene oxide (rGO) composite powders for application as anode materials in sodium-ion batteries was developed. The detailed mechanism of formation of the CoSex-rGO composite powders that were selected as the first target material in the spray pyrolysis process was studied. The crumple-structured CoSex-rGO composite powders prepared by spray pyrolysis at 800 °C had a crystal structure consisting mainly of Co0.85Se with a minor phase of CoSe2. The bare CoSex powders prepared for comparison had a spherical shape and hollow structure. The discharge capacities of the CoSex-rGO composite and bare CoSex powders in the 50th cycle at a constant current density of 0.3 A g-1 were 420 and 215 mA h g-1, respectively, and their capacity retentions measured from the second cycle were 80 and 46 %, respectively. The high structural stability of the CoSex-rGO composite powders for repeated sodium-ion charge and discharge processes resulted in superior sodium-ion storage properties compared to those of the bare CoSex powders. Spray composites: A simple one-pot synthesis of metal selenide/reduced graphene oxide (rGO) composite powders by a spray pyrolysis process was developed (see figure). This process could be applied in the preparation of crumple-structured cobalt selenide/rGO composite powders with various compositions for applications including anode materials for sodium-ion batteries.

Original languageEnglish
Pages (from-to)4140-4146
Number of pages7
JournalChemistry - A European Journal
Volume22
Issue number12
DOIs
Publication statusPublished - 2016 Mar 14

Keywords

  • electrochemistry
  • graphene
  • metal selenides
  • nanostructures
  • sodium-ion batteries

ASJC Scopus subject areas

  • Chemistry(all)

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