Composited Co3O4/Ag with flower-like nanosheets anchored on a porous substrate as a high-performance anode for Li-ion batteries

Abstract

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.