Facile hybridization of Ni@Fe2O3 superparticles with functionalized reduced graphene oxide and its application as anode material in lithium-ion batteries

This paper reports on a facile and non-thermal graphene wrapping approach of Ni@Fe2O3 particles, enhancing the battery performance of the Ni@Fe2O3 anode material performance in Li-ion batteries. [Display omitted] In our present work we developed a novel graphene wrapping approach of Ni@Fe2O3 superpa...

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Bibliographic Details
Published in:	Journal of colloid and interface science Vol. 478; pp. 155 - 163
Main Authors:	Backert, Gregor, Oschmann, Bernd, Tahir, Muhammad Nawaz, Mueller, Franziska, Lieberwirth, Ingo, Balke, Benjamin, Tremel, Wolfgang, Passerini, Stefano, Zentel, Rudolf
Format:	Journal Article
Language:	English
Published:	United States Elsevier Inc 15-09-2016
Subjects:	Anode materials Graphene wrapping Lithium-ion battery Superparticles Surface functionalization Surface functionalization Superparticles Lithium-ion battery Anode materials Graphene wrapping
Online Access:	Get full text
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Summary:	This paper reports on a facile and non-thermal graphene wrapping approach of Ni@Fe2O3 particles, enhancing the battery performance of the Ni@Fe2O3 anode material performance in Li-ion batteries. [Display omitted] In our present work we developed a novel graphene wrapping approach of Ni@Fe2O3 superparticles, which can be extended as a concept approach for other nanomaterials as well. It uses sulfonated reduced graphene oxide, but avoids thermal treatments and use of toxic agents like hydrazine for its reduction. The modification of graphene oxide is achieved by the introduction of sulfate groups accompanied with reduction and elimination reactions, due to the treatment with oleum. The successful wrapping of nanoparticles is proven by energy dispersive X-ray spectroscopy, high-resolution transmission electron microscopy and Raman spectroscopy. The developed composite material shows strongly improved performance as anode material in lithium-ion batteries (compared to unwrapped Ni@Fe2O3) as it offers a reversible capacity of 1051mAhg−1 after 40 cycles at C/20, compared with 460mAhg−1 for unwrapped Ni@Fe2O3. The C rate capability is also improved by the wrapping approach, as specific capacities for wrapped particles are about twice of those offered by unwrapped particles. Additionally, the benefit for the use of the advanced superparticle morphology is demonstrated by comparing wrapped Ni@Fe2O3 particles with wrapped Fe2O3 nanorice.
ISSN:	0021-9797 1095-7103
DOI:	10.1016/j.jcis.2016.06.011