Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 9, Pages 6332-6339Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am501551h
Keywords
porous carbon; ferroferric oxide; nickel oxide; graphene; lithium-ion battery
Funding
- National Natural Science Foundation of China [21101014, 21273022]
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Porous carbons such as CMK-3 are commonly used as matrices to accommodate metal oxides for the improvement of their electrochemical performance. However, the mesostructure of CMK-3 may be destroyed gradually with the increase of metal oxide content and some particles are inevitably formed outside the pores of CMK-3, leading to a gradual decrease in capacity and poor cycling performance. Herein, graphene-encapsulated CMK-3-metal oxides (Fe3O4 and NiO) are synthesized through a stepwise heterocoagulation method and exhibit improved electrochemical performances compared to uncoated CMK-3-metal oxides. The core-shell structure of these novel composites can protect the metal oxide particles on the surface of CMK-3 and avoid the aggregation of porous carbon-metal oxides. Moreover, the introduction of graphene may stabilize the mesostructure of CMK-3 during lithiation and delithiation processes and improve the electronic conductivity of the composite, which are conducive to enhancing electrochemical performances of porous carbon-supported metal oxides.
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