Gregory Gershinsky
Bar-Ilan University
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Featured researches published by Gregory Gershinsky.
Energy and Environmental Science | 2013
Hyun Deog Yoo; Ivgeni Shterenberg; Yosef Gofer; Gregory Gershinsky; Nir Pour; Doron Aurbach
The first working Mg rechargeable battery prototypes were ready for presentation about 13 years ago after two breakthroughs. The first was the development of non-Grignard Mg complex electrolyte solutions with reasonably wide electrochemical windows in which Mg electrodes are fully reversible. The second breakthrough was attained by demonstrating high-rate Mg cathodes based on Chevrel phases. These prototypes could compete with lead–acid or Ni–Cd batteries in terms of energy density, very low self-discharge, a wide temperature range of operation, and an impressive prolonged cycle life. However, the energy density and rate capability of these Mg battery prototypes were not attractive enough to commercialize them. Since then we have seen gradual progress in the development of better electrolyte solutions, as well as suggestions of new cathodes. In this article we review the recent accumulated experience, understandings, new strategies and materials, in the continuous R&D process of non-aqueous Mg batteries. This paper provides a road-map of this field during the last decade.
Langmuir | 2013
Gregory Gershinsky; Hyun Deog Yoo; Yosef Gofer; Doron Aurbach
Electrochemical, surface, and structural studies related to rechargeable Mg batteries were carried out with monolithic thin-film cathodes comprising layered V2O5 and MoO3. The reversible intercalation reactions of these electrodes with Mg ion in nonaqueous Mg salt solutions were explored using a variety of analytical tools. These included slow-scan rate cyclic voltammetry (SSCV), chrono-potentiometry (galvanostatic cycling), Raman and photoelectron spectroscopies, high-resolution microscopy, and XRD. The V2O5 electrodes exhibited reversible Mg-ion intercalation at capacities around 150-180 mAh g(-1) with 100% efficiency. A capacity of 220 mAh g(-1) at >95% efficiency was obtained with MoO3 electrodes. By applying the electrochemical driving force sufficiently slowly it was possible to measure the electrodes at equilibrium conditions and verify by spectroscopy, microscopy, and diffractometry that these electrodes undergo fully reversible structural changes upon Mg-ion insertion/deinsertion cycling.
Langmuir | 2014
E. Markevich; Gregory Salitra; Katia Fridman; Ronit Sharabi; Gregory Gershinsky; Arnd Garsuch; Guenter Semrau; Michael Schmidt; Doron Aurbach
The effect of fluorinated ethylene carbonate (FEC) as a cosolvent in alkyl carbonates/LiPF6 on the cycling performance of high-voltage (5 V) cathodes for Li-ion batteries was investigated using electrochemical tools, X-ray photoelectron spectroscopy (XPS), and high-resolution scanning electron microscopy (HRSEM). An excellent cycling stability of LiCoPO4/Li, LiNi0.5Mn1.5O4/Si, and LiCoPO4/Si cells and a reasonable cycling of LiCoPO4/Si cells was achieved by replacing the commonly used cosolvent ethylene carbonate (EC) by FEC in electrolyte solutions for high-voltage Li-ion batteries. The roles of FEC in the improvement of the cycling performance of high-voltage Li-ion cells and of surface chemistry on the cathode are discussed.
Energy and Environmental Science | 2014
Gregory Gershinsky; Elad Bar; Laure Monconduit; David Zitoun
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 FeSb2, 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.
Scientific Reports | 2017
Victor Shokhen; Yana Miroshnikov; Gregory Gershinsky; Noam Gotlib; Chen Stern; Doron Naveh; David Zitoun
Herein, we report energy storage devices, which are based on densely packed, vertically aligned MoS2 (VA-MoS2) or planar oriented MoS2 (PO-MoS2) and compare their electrochemical performances. The VA-MoS2 films have been processed by chemical vapor deposition (CVD) to reach unprecedented micron-scale thick films while maintaining the vertical alignment for the whole thickness. The VA-MoS2 and the PO-MoS2 films form a high-performance Li-ion electrode, reaching the theoretical limits of reversible capacity for this material (800 mAh/g; twice the specific capacity of graphite). The vertical alignment allows faster charge-discharge rates while maintaining a high specific capacity (C-rate measurements). Noteworthy, the reversible cycling of the Li-ion electrode also benefits from the vertical alignment. In this article, we present the full synthesis, structural and electrochemical characterization of VA-MoS2 along with the properties of PO-MoS2 to deconvolute the intrinsic properties of MoS2 from the influence of the layers’ orientation.
Materials for Renewable and Sustainable Energy | 2014
Kamal Annou; Mathilde Pelosi; Gregory Gershinsky; Frédéric Favier; Y. Cuminal; Monique Tillard; David Zitoun
Silicon nanomaterials are obtained by an original approach based on the direct solution phase oxidation of a solid state Zintl phase NaSi used as silicon precursor. Alcohols with different alkyl chains are chosen as oxidizing agents. The materials are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The most relevant parameter lies in the amorphous character of the silicon nanoparticles produced by this route. Amorphous nature of silicon is one of the key features for succeeding in the improvement of anodes for Li-ion batteries. The Si nanostructures have been tested as anodic materials for lithium ion batteries.
Electrochemistry Communications | 2012
Ran Elazari; Gregory Salitra; Gregory Gershinsky; Arnd Garsuch; Alexander Panchenko; Doron Aurbach
Journal of The Electrochemical Society | 2012
Ran Elazari; Gregory Salitra; Gregory Gershinsky; Arnd Garsuch; Alexander Panchenko; Doron Aurbach
Electrochemistry Communications | 2013
Ronit Sharabi; E. Markevich; Katia Fridman; Gregory Gershinsky; G. Salitra; Doron Aurbach; Guenter Semrau; Michael Schmidt; N. Schall; C. Bruenig
Chemistry of Materials | 2009
Elena Levi; Gregory Gershinsky; Doron Aurbach; Olivier Isnard; Gerbrand Ceder