Controllable preparation of Co3O4 nanosheets and their electrochemical performance for Li-ion batteries

Co3O4 nanosheets were prepared by selectively dealloying CoAl alloys at room temperature, and their thicknesses could be easily controlled to be similar to 6 nm, similar to 100 nm and similar to 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 similar to 6 nm-thick Co3O4 sheets demonstrated an initial capacity of 1259.5 mA h g(-1) as well as an excellent capacity stability.