A modified carbothermal reduction method for preparation of high-performance nano-scale core/shell Cu6Sn5 alloy anodes in Li-ion batteries

Wangjun Cui, Fei Wang, Jie Wang, Haijing Liu, Congxiao Wang, Yongyao Xia

Research output: Contribution to journalArticlepeer-review

Abstract

Core-shell structured, carbon-coated, nano-scale Cu6Sn 5 has been prepared by a modified carbothermal reduction method using polymer coated mixed oxides of CuO and SnO2 as precursors. On heat treatment, the mixture oxides were converted into Cu6Sn5 alloy by carbothermal reduction. Simultaneously, the remnants carbon was coated on the surface of the Cu6Sn5 particles to form a core-shell structure. Transmission electron microscope (TEM) images demonstrate that the well-coated carbon layer effectively prevents the encapsulated, low melting point alloy from out flowing in a high-temperature treatment process. Core-shell structured, carbon coated Cu6Sn5 delivers a reversible capacity of 420 mAh g-1 with capacity retention of 80% after 50 cycles. The improvement in the cycling ability can be attributed to the fact that the carbon-shell prevents aggregation and pulverization of nano-sized tin-based alloy particles during charge/discharge cycling.

Original languageEnglish
Pages (from-to)3633-3639
Number of pages7
JournalJournal of Power Sources
Volume196
Issue number7
DOIs
Publication statusPublished - 2011 Apr 1
Externally publishedYes

Keywords

  • Carbothermal reduction
  • Hydrophobic powders
  • Intermetallic compounds
  • Lithium-ion battery

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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