LAUSR

In this work, quasi two dimensional spinel ZnCo2O4 (ZCO) nanosheets constituted by ZCO grain with different size were prepared via a facile solvothermal method and followed by a post-treatment. It shows that the small ZCO grain can be obtained by a fast cooling post-treatment. Further, to enhance the conductivity of ZCO, uniform and compact ZCO nanosheets was in-situ grown on reduced graphene oxide (rGO), which was employed as template. When used as anode for lithium ions battery (LIB), rGO@ZCO has a large reversible capacity of 1107.2 mAh·g-1 at 100 mA·g-1 after 100 cycling, which is the highest among all ZCO samples. Moreover, when the current density is from 50 to 500 mA·g-1, the capacity of rGO@ZCO decreased from 1046.5 to 527.6 mAh·g-1, implying the superior rate ability. The electrochemical analysis together with calculations demonstrates that the unique structure is beneficial to promote the charge transport and adapt the volume change in charge-discharge process, resulting in expected LIB performance.