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One-step solid state reaction to selectively fabricate cubic and tetragonal CuFe2O4anode material for high power lithium ion batteries

Authors
Journal
Electrochimica Acta
0013-4686
Publisher
Elsevier
Publication Date
Volume
102
Identifiers
DOI: 10.1016/j.electacta.2013.03.174
Keywords
  • Solid State Reaction
  • Spinel Ferrites
  • Cubic And Tetragonal Cufe2O4
  • Li-Ion Batteries
  • Anode Materials
Disciplines
  • Chemistry

Abstract

Abstract Cubic CuFe2O4 (c-CuFe2O4) and tetragonal CuFe2O4 (t-CuFe2O4) nanoparticles were selectively prepared using a facile one-step solid state reaction route by ferrous oxalate and copper acetate as the reactants. As an anode material for Li-ion batteries, compared with c-CuFe2O4 and t-CuFe2O4 synthesized at 800°C, c-CuFe2O4 synthesized at 400°C with smaller particle size and larger surface area exhibited superior discharge capacities and better cycling performance (950mAhg−1at 100mAg−1 after 60 cycles), and higher rate capability. The influence of the two crystal phases on the electrochemical performance were only exhibited at the Li+ insertion process during the first discharge. The average particle size and the surface areas play an important role in effecting the lithium-ion storage capability and cycling ability. Through ex situ HRTEM analysis, we observed the existence of metastable FexCu1−x alloy in the discharged nanocomposition for the first time, which exhibits the interaction of metallic Cu particles with the adjacent iron ions.

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