Time filter

Source Type

Elia G.A.,University of Rome La Sapienza | Bresser D.,Helmholtz Institute Ulm | Bresser D.,Karlsruhe Institute of Technology | Bresser D.,CEA Grenoble | And 8 more authors.
ACS Applied Materials and Interfaces | Year: 2015

A novel lithium-ion/oxygen battery employing Pyr14TFSI-LiTFSI as the electrolyte and nanostructured LixSn-C as the anode is reported. The remarkable energy content of the oxygen cathode, the replacement of the lithium metal anode by a nanostructured stable lithium-alloying composite, and the concomitant use of nonflammable ionic liquid-based electrolyte result in a new and intrinsically safer energy storage system. The lithium-ion/oxygen battery delivers a stable capacity of 500 mAh g-1 at a working voltage of 2.4 V with a low charge-discharge polarization. However, further characterization of this new system by electrochemical impedance spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy reveals the progressive decrease of the battery working voltage, because of the crossover of oxygen through the electrolyte and its direct reaction with the LixSn-C anode. © 2015 American Chemical Society.


Hong I.,University of Rome La Sapienza | Angelucci M.,University of Rome La Sapienza | Verrelli R.,University of Rome La Sapienza | Betti M.G.,University of Rome La Sapienza | And 5 more authors.
Journal of Power Sources | Year: 2014

Iron oxide nanowires are synthesized and characterized as negative electrode for lithium ion battery. The lithium-conversion reaction of the material is studied by electrochemical techniques as well as by XRD and SEM. Lithium cells based on the electrode material evidence a reversible capacity of about 800 mAh g-1 and a multiple-step electrochemical process leading to the formation of amorphous compound. Furthermore, SEM analysis of the compound formed by direct lithium atoms deposition on the iron oxide nanowires clearly evidences the change of the electrode morphology upon formation of a lithiated phase. We believe that the data here reported may shed light on the properties of the iron oxide nanowires as high capacity anode for lithium ion battery. © 2014 Elsevier B.V. All rights reserved.


Elia G.A.,University of Rome La Sapienza | Hassoun J.,University of Rome La Sapienza | Kwak W.-J.,Hanyang University | Sun Y.-K.,Hanyang University | And 10 more authors.
Nano Letters | Year: 2014

A novel lithium-oxygen battery exploiting PYR14TFSI-LiTFSI as ionic liquid-based electrolyte medium is reported. The Li/PYR14TFSI-LiTFSI/O2 battery was fully characterized by electrochemical impedance spectroscopy, capacity-limited cycling, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The results of this extensive study demonstrate that this new Li/O2 cell is characterized by a stable electrode-electrolyte interface and a highly reversible charge-discharge cycling behavior. Most remarkably, the charge process (oxygen oxidation reaction) is characterized by a very low overvoltage, enhancing the energy efficiency to 82%, thus, addressing one of the most critical issues preventing the practical application of lithium-oxygen batteries. © 2014 American Chemical Society.


Kwak W.-J.,Hanyang University | Shin H.-J.,Hanyang University | Reiter J.,BMW AG | Tsiouvaras N.,BMW AG | And 5 more authors.
Journal of Materials Chemistry A | Year: 2016

Lithium oxygen batteries are attractive battery systems which can provide high energy density for the next generation. However, even if many research studies have made progress for years, the studies about substitution of Li metal which has inherent limitations in terms of stability and long term cycling properties are terribly deficient. Herein, our group clearly demonstrates the ambiguous unsolved problems of lithium oxygen full-cells using an alternative anode for Li metal by XRD and SEM analysis. The amount of Li source in the alternative anode is limited compared to the quasi-infinite amount of Li source in Li metal. The returning lithium ions during charging form lithium hydroxide which passivates the anode by a side reaction with moisture in the electrolyte and from outside. This report will help to accelerate the development of lithium oxygen full-cells. © 2016 The Royal Society of Chemistry.


Serra Moreno J.,University of Rome La Sapienza | Maresca G.,University of Rome La Sapienza | Panero S.,University of Rome La Sapienza | Scrosati B.,Elettrochimica Ed Energia | And 2 more authors.
Electrochemistry Communications | Year: 2014

Mixtures, based on the N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI) ionic liquid and the NaTFSI salt, as low flammability and volatility electrolytes for safer sodium electrochemical energy storage devices, were prepared and investigated in terms of thermal and ion-transport properties. The PYR14TFSI-NaTFSI electrolytes showed melting point down to - 30 C. No difference in terms of ion-transport properties was observed with respect to analogous lithium electrolyte systems. Conductivity values above 1 × 10- 3 S cm- 1 were observed at room temperature. © 2014 Elsevier B.V.


PubMed | University of Rome La Sapienza, Hanyang University, BMW AG, Helmholtz Institute Ulm and Elettrochimica ed Energia
Type: Journal Article | Journal: ACS applied materials & interfaces | Year: 2015

A novel lithium-ion/oxygen battery employing Pyr14TFSI-LiTFSI as the electrolyte and nanostructured LixSn-C as the anode is reported. The remarkable energy content of the oxygen cathode, the replacement of the lithium metal anode by a nanostructured stable lithium-alloying composite, and the concomitant use of nonflammable ionic liquid-based electrolyte result in a new and intrinsically safer energy storage system. The lithium-ion/oxygen battery delivers a stable capacity of 500 mAh g(-1) at a working voltage of 2.4 V with a low charge-discharge polarization. However, further characterization of this new system by electrochemical impedance spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy reveals the progressive decrease of the battery working voltage, because of the crossover of oxygen through the electrolyte and its direct reaction with the LixSn-C anode.


Agostini M.,University of Rome La Sapienza | Hassoun J.,University of Rome La Sapienza | Liu J.,Waseda University | Jeong M.,Waseda University | And 6 more authors.
ACS Applied Materials and Interfaces | Year: 2014

In this paper, we report a lithium-ion battery employing a lithium sulfide cathode and a silicon-based anode. The high capacity of the silicon anode and the high efficiency and cycling rate of the lithium sulfide cathode allowed optimal full cell balance. We show in fact that the battery operates with a very stable capacity of about 280 mAh g-1 at an average voltage of 1.4 V. To the best of our knowledge, this battery is one of the rare examples of lithium-metal-free sulfur battery. Considering the high theoretical capacity of the employed electrodes, we believe that the battery here reported may be of potential interest as high-energy, safe, and low-cost power source for electric vehicles. © 2014 American Chemical Society.


Carbone L.,University of Rome La Sapienza | Gobet M.,York College - The City University of New York | Peng J.,York College - The City University of New York | Peng J.,City University of New York | And 4 more authors.
ACS Applied Materials and Interfaces | Year: 2015

Herein, we report the characteristics of electrolytes using various ether-solvents with molecular composition CH3O[CH2CH2O]nCH3, differing by chain length, and LiCF3SO3 as the lithium salt. The electrolytes, considered as suitable media for lithium-sulfur batteries, are characterized in terms of thermal properties (TGA, DSC), lithium ion conductivity, lithium interface stability, cyclic voltammetry, self-diffusion properties of the various components, and lithium transference number measured by NMR. Furthermore, the electrolytes are characterized in lithium cells using a sulfur-carbon composite cathode by galvanostatic charge-discharge tests. The results clearly evidence the influence of the solvent chain length on the species mobility within the electrolytes that directly affects the behavior in lithium sulfur cell. The results may effectively contribute to the progress of an efficient, high-energy lithium-sulfur battery. (Figure Presented). © 2015 American Chemical Society.


PubMed | University of Rome La Sapienza, Hanyang University, BMW AG, Helmholtz Institute Ulm and Elettrochimica ed Energia
Type: Journal Article | Journal: Chemistry (Weinheim an der Bergstrasse, Germany) | Year: 2016

In this paper, we report an advanced long-life lithium ion battery, employing a Pyr14 TFSI-LiTFSI non-flammable ionic liquid (IL) electrolyte, a nanostructured tin carbon (Sn-C) nanocomposite anode, and a layered LiNi1/3 Co1/3 Mn1/3 O2 (NMC) cathode. The IL-based electrolyte is characterized in terms of conductivity and viscosity at various temperatures, revealing a Vogel-Tammann-Fulcher (VTF) trend. Lithium half-cells employing the Sn-C anode and NMC cathode in the Pyr14 TFSI-LiTFSI electrolyte are investigated by galvanostatic cycling at various temperatures, demonstrating the full compatibility of the electrolyte with the selected electrode materials. The NMC and Sn-C electrodes are combined into a cathode-limited full cell, which is subjected to prolonged cycling at 40C, revealing a very stable capacity of about 140mAhg(-1) and retention above 99% over 400 cycles. The electrode/electrolyte interface is further characterized through a combination of electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) investigations upon cell cycling. The remarkable performances reported here definitively indicate that IL-based lithium ion cells are suitable batteries for application in electric vehicles.


PubMed | University of Rome La Sapienza, Elettrochimica ed Energia, York College - The City University of New York and City University of New York
Type: Comparative Study | Journal: ACS applied materials & interfaces | Year: 2015

Herein, we report the characteristics of electrolytes using various ether-solvents with molecular composition CH3O[CH2CH2O]nCH3, differing by chain length, and LiCF3SO3 as the lithium salt. The electrolytes, considered as suitable media for lithium-sulfur batteries, are characterized in terms of thermal properties (TGA, DSC), lithium ion conductivity, lithium interface stability, cyclic voltammetry, self-diffusion properties of the various components, and lithium transference number measured by NMR. Furthermore, the electrolytes are characterized in lithium cells using a sulfur-carbon composite cathode by galvanostatic charge-discharge tests. The results clearly evidence the influence of the solvent chain length on the species mobility within the electrolytes that directly affects the behavior in lithium sulfur cell. The results may effectively contribute to the progress of an efficient, high-energy lithium-sulfur battery.

Loading Elettrochimica Ed Energia collaborators
Loading Elettrochimica Ed Energia collaborators