Controllable preparation of Co3O4nanosheets and their electrochemical performance for Li-ion batteries

Abstract

Co₃O₄ nanosheets were prepared by selectively dealloying CoAl alloys at room temperature, and their thicknesses could be easily controlled to be ∼6 nm, ∼100 nm and ∼500 nm. Then they were employed as anodes for lithium-ion batteries to study the electrochemical performance as a function of the thickness of the nanosheets. The results showed that the thinner they were, the better performance they presented, especially at high current density. Thereinto, the obtained ∼6 nm-thick Co₃O₄ sheets demonstrated an initial capacity of 1259.5 mA h g⁻¹ as well as an excellent capacity stability.