Bar Ilan Institute of Nanotechnology and Advanced Materials BINA

Ramat Gan, Israel

Bar Ilan Institute of Nanotechnology and Advanced Materials BINA

Ramat Gan, Israel

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Gershinsky G.,Bar Ilan Institute of Nanotechnology and Advanced Materials BINA | Bar E.,Bar Ilan Institute of Nanotechnology and Advanced Materials BINA | Monconduit L.,Alistore European Research Institute | Zitoun D.,Bar Ilan Institute of Nanotechnology and Advanced Materials BINA
Energy and Environmental Science | Year: 2014

One of the challenges in the development of batteries consists of investigating new electrode materials and comprehending the mechanism of lithium uptake. Herein, we report on the first operando measurements of electron magnetism in a battery during cycling. We have succeeded in designing a non-magnetic cell and have investigated the lithiation mechanism of FeSb 2, a high energy density anode material. The stepwise increase of the magnetic moment reveals an increase of amorphous Fe nanoparticle size, while Sb undergoes reversible alloying with Li. This journal is © the Partner Organisations 2014.


Grinbom G.,Bar Ilan Institute of Nanotechnology and Advanced Materials BINA | Duveau D.,Alistore European Research Institute | Gershinsky G.,Bar Ilan Institute of Nanotechnology and Advanced Materials BINA | Monconduit L.,Alistore European Research Institute | Zitoun D.,Bar Ilan Institute of Nanotechnology and Advanced Materials BINA
Chemistry of Materials | Year: 2015

Nanomaterials have triggered a lot of attention as potential triggers for a technological breakthrough in Energy Storage Devices and specifically Li-ion batteries. Herein, we report the original synthesis of well-defined silicon/iron oxide nanoparticles and its application as anode materials for Li-ion batteries. This model compound is based on earth abundant elements and allows for a full investigation of the electrochemical reactions through its iron oxide magnetic phase. The elaboration of silicon with iron oxide grown on its surface has been achieved by reacting an organometallic precursor Fe(CO)5 with Si nanopowder and subsequent slow oxidation step in air yields hollow γ-Fe2O3 on the Si surface. This specific morphology results in an enhancement of the specific capacity from 2000 mAh/gSi up to 2600 mAh/gSi. Such a high specific capacity is achieved only for hollow γ-Fe2O3 and demonstrates a novel approach toward the modification of electrode materials with an earth abundant transition metal like iron. This result further emphasizes the need for precisely designed nanoparticles in achieving significant progress in energy storage. © 2015 American Chemical Society.


Shviro M.,Bar Ilan Institute of Nanotechnology and Advanced Materials BINA | Zitoun D.,Bar Ilan Institute of Nanotechnology and Advanced Materials BINA
Journal of Physical Chemistry C | Year: 2014

We report on the synthesis of Ni/Ag heterogeneous nanocrystals. Ag almost exclusively nucleates on the vertices of Ni nanopyramids and vertices and edges of Ni nanocubes. The synthesis is carried on using the decomposition of an organometallic Ni precursor to achieve a shape control (cubes and pyramids) followed by a nonaqueous galvanic replacement reaction of Ag(I). The colloids exhibit both plasmonic resonance and superparamagnetic behavior. Interestingly, the bimetallic nanocrystals display a magnetic moment higher than the pristine Ni nanocrystals, suggesting a specific magnetic polarization of the Ni/Ag interface or silver tips. © 2014 American Chemical Society.

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