Electrochemical properties of Cu6Sn5-C composite powders with mixture of Cu5Sn6@void@C yolk-shell, Cu5Sn6 alloy, and hollow carbon

Yong Seung Jang, Jung Hyun Kim, Seung Ho Choi, Kwang Min Yang, Yun Chan Kang

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

SnO2-CuO-C composite powders consisting of hollow-structured particles are directly prepared using template-free spray pyrolysis. Reduction of the composite powders at 1000°C produces Cu6Sn5-C composite powders containing a mixture of Cu5Sn6@void@C yolk-shell, Cu5Sn6 alloy, and hollow carbon particles. In the yolk-shell powder, mobile Cu5Sn6 powder particle is located inside the hollow hard-carbon powder particle. The mean sizes of the Cu5Sn6 alloy and carbon powders are 0.7 and 1.6 μm, respectively. The submicron Cu5Sn6 alloy powders are coated with a uniformly thin carbon layer. The initial charge and discharge capacities of the composite powders are 254 and 578 mAh g-1, respectively, at a high current density of 300 mA g-1. The charge capacity of the composite powders slightly increases with increasing number of cycles during the first three cycles. The maximum charge capacity of the composite powders is 300 mAh g-1. The charge capacity of the composite powders is 241 mAh g-1 after 30 cycles, at which point the capacity retention is 80%. The unique particle structure and phase homogeneity improve the cycle properties of the composite alloy powders.

Original languageEnglish
Pages (from-to)12531-12544
Number of pages14
JournalInternational Journal of Electrochemical Science
Volume7
Issue number12
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • Aloy powder
  • Anode materials
  • Composite powders
  • Spray pyrolysis

ASJC Scopus subject areas

  • Electrochemistry

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