Electrochemical properties of hollow, spherical Li2O-SnO2-Cu-C nanocomposite powders prepared by spray pyrolysis

Yong Seung Jang, Jung Hyun Kim, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Hollow and spherical Li2O-SnO2-Cu-C nanocomposite powder is prepared by spray pyrolysis. Examination of the nanocomposite powder shows that Li2O-SnO2-Cu particles are uniformly distributed over a hollow C matrix. Li2O-SnO2-Cu-C nanocomposite powder has better cycling performance than do Li2O-SnO2-CuO-C and Li2O-SnO2-Cu2O-C nanocomposite powders. The uniform mixing of electrochemically inactive Cu metal and electrochemically active SnO2 improves the cycling performance of Li2O-SnO2-Cu-C powder. The charge capacity of Li2O-SnO2-Cu-C nanocomposite powder drops from 547 to 449 mAh g-1 after 130 cycles at a current density of 700 mA g-1; the corresponding capacity retention is 82%. The capacity retention of the Li2O-SnO2-CuO-C and Li2O-SnO2-Cu2O-C nanocomposite powders after 130 cycles is 44% and 52%, respectively. The cycling performance of the SnO2-Cu-C and Li2O-SnO2-CuO nanocomposite powders is compared to that of Li2O-SnO2-Cu-C powder. The presence of Li2O and a C matrix improve the rate performance as well as the cycling performance of the nanocomposite powders by minimizing the crystal growth of SnO2 during repeated charging and discharging cycles.

Original languageEnglish
Pages (from-to)6807-6817
Number of pages11
JournalInternational Journal of Electrochemical Science
Volume8
Issue number5
Publication statusPublished - 2013 Jun 12
Externally publishedYes

Keywords

  • Anode material
  • Composite powders
  • Lithium-ion battery
  • Spray pyrolysis

ASJC Scopus subject areas

  • Electrochemistry

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