Strategy for yolk-shell structured metal oxide-carbon composite powders and their electrochemical properties for lithium-ion batteries

Hyeon Seok Ju, Young Jun Hong, Jung Sang Cho, Yun Chan Kang

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

A strategy for the preparation of metal oxide-carbon composite powders with yolk-shell structure by simple spray pyrolysis is introduced. Mn-Sn-O-C composite powders with yolk-shell structure representing the first target material are prepared by one-pot spray pyrolysis and their formation mechanism is evaluated. Phase separation of polyvinylpyrrolidone (PVP), Sn, and Mn components during the drying stage of droplets plays a key role in the formation of yolk-shell structured composite powders. The repeated combustion and contraction processes of the dried powders under N2 atmosphere produce the desired Mn-Sn-O-C composite powders with yolk-shell structure. The shell and core parts of the yolk-shell powders prepared directly by spray pyrolysis at 900 °C are MnO-Mn2SnO4-C and Sn-Mn2SnO4-C composites, respectively. The initial discharge capacities of the composite powders prepared at 700 and 900 °C at the current density of 1 A g-1 are 1058 and 1204 mA h g-1, respectively. The discharge capacities of the composite powders prepared at 900 °C for the 2nd and 100th cycle are 803 and 784 mA h g-1, respectively. The structural stability of the Mn-Sn-O-C composite powders with yolk-shell structure during cycling results in good electrochemical performance.

Original languageEnglish
Pages (from-to)137-144
Number of pages8
JournalCarbon
Volume100
DOIs
Publication statusPublished - 2016 Apr 1

Keywords

  • Carbon composite
  • Lithium ion battery
  • Spray pyrolysis
  • Yolk-shell

ASJC Scopus subject areas

  • Chemistry(all)

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