FRECHERO marisa Alejandra
congresos y reuniones científicas
Study of doped-Phosphate Polyanion electrode and bismuth-phosphate glassy electrolyte. Lithium ion solid state batteries
Buenos Aires
Conferencia; 20 Topical Meeting of the international society of Electrochemistry; 2017
KEY SPEAKER.Our World demands new alternatives of sources of energy. New ways of production and storage have led the scientific and technological community to develop innovative devices that must be environmentally clean and safe. Those methods have to provide an efficient performance and a renewable use in order to allow a sustainable development. Considering this scenario, Lithium Ion Batteries play a leading role today.Our main goal has been to improve not only the electrolyte ionic conductivity but also to reach a material suitable for electrodes that fits -as good as it can- the interface between both; one of the most important issues to overcome in order to obtain a new generation of all-solid state batteries.In the light of these requirements, we will refer to several materials based on PhosphatePolyanion of general formula: Li3V2-xNbx(PO4)3/C and Li3V2-xCux(PO4)3/C (0≤x≤0.3); modified by extra carbon sources as Carbon Black and Carbon Nano-Fibers and with different oxides (TiO2, MoO3, WO3, etc), in order to obtain well-crystallized pure-phase materials with their electronic conduction reinforced.We will develop their structural features through different techniques as micro Raman Spectroscopy, FTIR, Scanning Electronic Microscopy, DSC, DRX, etc. Additionally, we will discuss the results of a comprehensive electrical study, mostly by Impedance Spectroscopy, in order to reveal the electrical behavior of individual materials (including the microscopic fundamental interpretation of the charge carrier mechanisms involved) and their electrical behavior in the electrode/electrolyte interaction in order to show the phenomenon of the charge transport at the interface between them [1].Furthermore, a new modified lithium-bismuth-phosphate glass has been obtained by the use of environmentally friendly components which are low cost and which can be eventually recycled.In this work, we report some modifications in phosphate-bismuthate glass which allow hugeimprovements in their electrical properties because of the changes in the 3D structure making them exceptional candidates for being solid electrolytes in solid lithium ion batteries. Structural and electrical characterization is made by XRD, DTA, XRF, FTIR, Density and Impedance measurements.Frequency-dependent electrical data will be discussed in the framework of the electric modulus representation. Structural properties studied by X-ray diffraction, density and FTIR will be correlated to the electrical behavior of the glass [2].[1]Terny, S. and Frechero M. A. ?Study of Phosphate Polyanion Electrodes and theirperformance with glassy electrolytes: potential application in Lithium ion solid state batteries?. Book title: Advanced Materials Series. : WILEY-Scrivener. (2016). p322 - 365. ISBN: 978-1-118-99830-4.Editor: ASHUTOSH TIWARI.[2]P. E. Di PrĂ¡tula, S. Terny, M. E. Sola and M. A. Frechero. ?A remarkable improvement of ionic conduction in an environmental friendly glassy lithium electrolyte?. Research and Reviews in Materials Science and Chemistry, Vol. 7, Issue 1, 2016, Pages 25-42.