Metal–Organic frameworks (MOFs) and their derivatives
have
been widely used in lithium-ion batteries (LIBs) since their introduction
because of their high porosity, large specific surface area, and structural
and functional versatility. In this paper, the Zn–Co MOF-derived
nanocages oxides with porous channel-crossing structure were successfully
prepared by a low-temperature calcination self-assembly strategy.
As anode of LIBs, the reduced graphene oxide (RGO)/ZnO/Co3O4 has excellent rating and cycling performances compared
to the RGO/Co3O4. The RGO/ZnO/Co3O4 electrode maintains a reversible capacity of about
900 mAh g–1 after 500 cycles, which is 1.5 times
higher than that of the RGO/Co3O4 electrode.
At high current density of 2 A g–1, the discharge
specific capacity of RGO/ZnO/Co3O4 is 500 mAh
g–1, which is 1.25 times that of RGO/Co3O4. The superior electrochemical performance is attributed
to its specific three-dimensional porous channel structure and internal
Zn/Co oxide semiconductor heterointerface structure, which increases
the effective active area of the electrode, improves the storage capacity
and carrier transport efficiency of Li+, and enhances the
overall structural stability as well as electrochemical activity.
In addition, the improved electrochemical performance cannot be achieved
without the synergistic effect of ZnO and Co3O4.
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