▎ 摘　　要

We have successfully synthesized graphene-like Co(OH)(2) and fabricated sandwich-like Co(OH)(2)/graphene hybrids by the electrostatic self-assembly. After annealing at low temperatures, we further fabricated Co3O4 nanosheet/graphene hybrids, in which the thickness of graphene-like Co3O4 nanosheets is only similar to 5 nm. The as-prepared product exhibits a very high reversible lithium storage capacity up to 982.6 mAh g(-1) after 50 cycles, while pure Co3O4 nanosheets only show the discharge capacity of 108 mAh g(-1) after 50 cycles. Moreover, in comparison with the reported results, it exhibits an ultrahigh rate capability of 209.7 mAh g(-1) at 5000 mA g(-1). The greatly improved electrochemical performances may be ascribed to the sandwich-like structure of ultrathin Co3O4 nanosheet/graphene. (c) 2016 Elsevier B.V. All rights reserved.