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Co3O4/Ag composites with flower-like nanosheets anchored on a porous substrate are easily fabricated through directly dealloying CoAgAl alloys under mild conditions. Three different Ag contents in the nanocomposites are conveniently achieved by means of controlling the feeding component of the alloy precursor. Electrochemical measurements of lithium storage indicate that the incorporation of well-conductive Ag into Co3O4 dramatically enhances its cycling stability, especially at high current rates. The Co3O4/Ag composite with 20 at.% Ag shows superior capacity and outstanding cycling stability, even at a high rate of 1000 mA g−1 for a long term of 1000 cycles. Meanwhile, it performs excellently in rate capability. With the advantages of unique performance and easy preparation, the Co3O4/Ag nanocomposite holds great application potential as an advanced anode material for lithium-ion batteries. [ABSTRACT FROM AUTHOR]

Upon dealloying a carefully designed CoCuAl ternary alloy in NaOH solution at room temperature, a Co3O4/CuO nanocomposite with an interconnected porous microstructure assembled by a secondary structure of nanosheets was successfully fabricated. By using the dealloying strategy, the target metals directly grew to form uniform bimetallic oxide nanocomposites. Owing to the unique hierarchical structure and the synergistic effect of both active electrode materials, the Co3O4/CuO nanocomposite exhibits much enhanced electrochemical performance with higher capacities and better cycling stability compared to anodes of pure Co3O4. Moreover, it performs excellently in terms of cycle reversibility, Coulombic efficiency, and rate capability, at both low or high current rates. With the advantages of unique performance and ease of preparation, the as-made Co3O4/CuO nanocomposite demonstrates promising application potential as an advanced anode material for lithium-ion batteries. [ABSTRACT FROM AUTHOR]