Article ID Journal Published Year Pages File Type
185334 Electrochimica Acta 2014 8 Pages PDF
Abstract

•Ultrathin-shell graphene hollow spheres were synthesized by a simple template assisted method without surfactant.•The thickness of the shell is uniform and only 5 nm.•The graphene hollow spheres show excellent electrochemical performance.

In this work, ultrathin-shell graphene hollow spheres have been designed and synthesized from the graphene oxide nanosheets by a simple template assisted method without surfactant. It is found that the obtained graphene hollow spheres have a high surface area (248.3 m2 g−1), ultrathin porous shells (5 nm) and an interconnected structure. More strikingly, the as-prepared graphene hollow spheres exhibit outstanding electrochemical performance as an anode material for lithium-ion batteries. Even at a high current density of 5000 mA g−1, a high reversible specific capacity of 249.3 mAh g−1 can be achieved. Furthermore, after 100 cycles, about 97.1% of the specific capacity is maintained at a high current density of 1000 mA g−1. The excellent electrochemical properties could be attributed to the attractive structure advantages of the graphene hollow spheres including the high surface area, ultrathin porous shells and an interconnected structure.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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