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Angenendt K.,Chalmers University of Technology | Johansson P.,Chalmers University of Technology | Johansson P.,Alistore European Research Institute
Journal of Physical Chemistry B | Year: 2011

The solvation of lithium salts in ionic liquids (ILs) leads to the creation of a lithium ion carrying species quite different from those found in traditional nonaqueous lithium battery electrolytes. The most striking differences are that these species are composed only of ions and in general negatively charged. In many IL-based electrolytes, the dominant species are triplets, and the charge, stability, and size of the triplets have a large impact on the total ion conductivity, the lithium ion mobility, and also the lithium ion delivery at the electrode. As an inherent advantage, the triplets can be altered by selecting lithium salts and ionic liquids with different anions. Thus, within certain limits, the lithium ion carrying species can even be tailored toward distinct important properties for battery application. Here, we show by DFT calculations that the resulting charge carrying species from combinations of ionic liquids and lithium salts and also some resulting electrolyte properties can be predicted. © 2011 American Chemical Society. Source


Tarascon J.-M.,CNRS Laboratory of Chemistry and Reactivity of Solids | Tarascon J.-M.,Alistore European Research Institute
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences | Year: 2010

Batteries are a major technological challenge in this new century as they are a key method to make more efficient use of energy. Although today's Li-ion technology has conquered the portable electronic markets and is still improving, it falls short of meeting the demands dictated by the powering of both hybrid electric vehicles and electric vehicles or by the storage of renewable energies (wind, solar). There is room for optimism as long as we pursue paradigm shifts while keeping in mind the concept of materials sustainability. Some of these concepts, relying on new ways to prepare electrode materials via eco-efficient processes, on the use of organic rather than inorganic materials or new chemistries will be discussed. Achieving these concepts will require the inputs of multiple disciplines. © 2010 The Royal Society. Source


Scheers J.,Chalmers University of Technology | Fantini S.,Solvionic SA | Johansson P.,Chalmers University of Technology | Johansson P.,Alistore European Research Institute
Journal of Power Sources | Year: 2014

To optimize the electrolyte is one of the most important directions to take in order to improve the Li/S battery in terms of performance - especially cell cyclability, rate capability, safety, and life-span. In this review we examine the state of the art for different choices of electrolytes; concepts, design, and materials, and how the resulting chemical and physical properties of the electrolyte affect the overall Li/S battery performance. The objective is to create an overall assessment of electrolytes in use at present and to provide a thorough basis for rational selection of future electrolytes for Li/S batteries. © 2014 Elsevier B.V. All rights reserved. Source


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. Source


Ponrouch A.,CSIC - Institute of Materials Science | Ponrouch A.,Alistore European Research Institute | Goni A.R.,CSIC - Institute of Materials Science | Goni A.R.,Catalan Institution for Research and Advanced Studies | And 2 more authors.
Electrochemistry Communications | Year: 2013

Electrochemical performance of hard carbon prepared from sugar pyrolysis was investigated against sodium anodes. Specific surface area and graphitization degree are determinant for achieving the highest reversible capacity ever reported (more than 300 mAh/g at C/10 after 120 cycles) with excellent rate capability. Such results were obtained using additive free EC:PC based electrolyte which appears to induce the formation of a more conducting solid electrolyte interphase (SEI) than that produced in the presence of 2% fluoroethylene carbonate (FEC). © 2012 Elsevier B.V. All rights reserved. Source

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