Pitch-derived carbon coated SnO 2 –CoO yolk–shell microspheres with excellent long-term cycling and rate performances as anode materials for lithium-ion batteries

Jae Hun Choi, Gi Dae Park, Dae Soo Jung, Yun Chan Kang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

SnO 2 -based composite materials have been studied as efficient anode materials for lithium-ion batteries. In this study, pitch-derived carbon coated SnO 2 –CoO yolk–shell microspheres were synthesized by a spray drying process. Pitch is a widely used source material for electrically conductive carbon. Pitch-infiltrated SnO 2 –Co 3 O 4 were transformed into SnO 2 –CoO–C yolk–shell microspheres by a carbothermal reduction. SnO 2 –CoO–C yolk–shell microspheres with a carbon content of 15 wt% exhibited superior cycling and rate performances compared with those of the bare SnO 2 –Co 3 O 4 microspheres with the same morphologies. The discharge capacities of SnO 2 –Co 3 O 4 and SnO 2 –CoO–C at the 100th cycle were 565 and 812 mA h g −1 , while their capacity retentions calculated from the second cycle were 51 and 97%, respectively. Furthermore, SnO 2 –CoO–C yolk–shell microspheres exhibited high and stable reversible capacities even at an extremely high current density of 30 A g −1 . The discharge capacity of SnO 2 –CoO–C yolk–shell microspheres at the 1000th cycle at a current density of 3.0 A g −1 was 775 mA h g −1 . The synergetic effect of the pitch-derived carbon with a high electrical conductivity, catalytic effect of the metallic Co, crystal growth minimization of metallic Co and Sn by reciprocal action, and yolk–shell structure with empty shells provided the SnO 2 –CoO–C yolk–shell microspheres with excellent lithium-ion storage performances.

Original languageEnglish
Pages (from-to)726-735
Number of pages10
JournalChemical Engineering Journal
DOIs
Publication statusPublished - 2019 Aug 1

Keywords

  • Cobalt monoxide
  • Lithium-ion battery
  • Pitch-derived carbon
  • Spray drying
  • Tin oxide
  • Yolk-shell

ASJC Scopus subject areas

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

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