Kilogram-scale production of SnO2 yolk-shell powders by a spray-drying process using dextrin as carbon source and drying additive

Seung Ho Choi, Yun Chan Kang

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

A simple and general method for the large-scale production of yolk-shell powders with various compositions by a spray-drying process is reported. Metal salt/dextrin composite powders with a spherical and dense structure were obtained by spray drying and transformed into yolk-shell powders by simple combustion in air. Dextrin plays a key role in the preparation of precursor powders for fabricating yolk-shell powders by spray drying. Droplets containing metal salts and dextrin show good drying characteristics even in a severe environment of high humidity. Sucrose, glucose, and polyvinylpyrrolidone are widely used as carbon sources in the preparation of metal oxide/carbon composite powders; however, they are not appropriate for large-scale spray-drying processes because of their caramelization properties and adherence to the surface of the spray dryer. SnO2 yolk-shell powders were studied as the first target material in the spray-drying process. Combustion of tin oxalate/dextrin composite powders at 600°C in air produced single-shelled SnO2 yolk-shell powders with the configuration SnO 2@void@SnO2. The SnO2 yolk-shell powders prepared by the simple spray-drying process showed superior electrochemical properties, even at high current densities. The discharge capacities of the SnO2 yolk-shell powders at a current density of 2000mAg-1 were 645 and 570mAhg-1 for the second and 100th cycles, respectively; the corresponding capacity retention measured for the second cycle was 88%. Not just an empty shell: Tin oxalate/dextrin composite powders were produced on a large scale by means of a commercial spray-drying process and transformed into single-shelled SnO2 yolk-shell powders by combustion in air at 600°C (see figure). The SnO2 yolk-shell powders showed superior electrochemical properties as anode materials for lithium-ion batteries.

Original languageEnglish
Pages (from-to)5835-5839
Number of pages5
JournalChemistry - A European Journal
Volume20
Issue number19
DOIs
Publication statusPublished - 2014 May 5

Keywords

  • electrochemistry
  • lithium-ion batteries
  • nanoparticles
  • spray drying
  • tin oxide

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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