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|Title:||Graphene-encapsulated hollow Fe3O4 nanoparticle aggregates as a high-performance anode material for lithium ion batteries|
lithium ion batteries
|Citation:||Chen, D., Ji, G., Ma, Y., Lee, J.Y., Lu, J. (2011-08-24). Graphene-encapsulated hollow Fe3O4 nanoparticle aggregates as a high-performance anode material for lithium ion batteries. ACS Applied Materials and Interfaces 3 (8) : 3078-3083. ScholarBank@NUS Repository. https://doi.org/10.1021/am200592r|
|Abstract:||Graphene-encapsulated ordered aggregates of Fe3O4 nanoparticles with nearly spherical geometry and hollow interior were synthesized by a simple self-assembly process. The open interior structure adapts well to the volume change in repetitive Li+ insertion and extraction reactions; and the encapsulating graphene connects the Fe 3O4 nanoparticles electrically. The structure and morphology of the graphene-Fe3O4 composite were confirmed by X-ray diffraction, scanning electron microscopy, and high-resolution transmission microscopy. The electrochemical performance of the composite for reversible Li+ storage was evaluated by cyclic voltammetry and constant current charging and discharging. The results showed a high and nearly unvarying specific capacity for 50 cycles. Furthermore, even after 90 cycles of charge and discharge at different current densities, about 92% of the initial capacity at 100 mA g-1 was still recoverable, indicating excellent cycle stability. The graphene-Fe3O4 composite is therefore a capable Li+ host with high capacity that can be cycled at high rates with good cycle life. The unique combination of graphene encapsulation and a hollow porous structure definitely contributed to this versatile electrochemical performance. © 2011 American Chemical Society.|
|Source Title:||ACS Applied Materials and Interfaces|
|Appears in Collections:||Staff Publications|
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