Talk by Dr. M.V. Venkatashamy Reddy on "Advanced Functional materials for Energy storage and Conversion"

Commercial lithium ion batteries (LIBs) use layer-type compounds, lithium cobalt oxide (LiCoO2) or LiFePO4 as the cathode (positive electrode) and graphite (C) as the anode (negative electrode) material, and a non-aqueous Li- ion conducting electrolyte. The liquid electrolyte in the form of a solution or immobilized in a gel-polymer. LIBs with an operating voltage of 3.6 V are extensively used in the present-day portable electronic devices like, cell phones and other low power operated devices. For high-power applications like, electric/hybrid electric vehicles and back-up power supplies and, the LIBs need to satisfy several criteria, namely, cost-reduction, improvement in the energy density, safety-in-operation at high current charge/discharge rates and improvement in the low-temperature-operation. To satisfy the above criteria, researches are being carried out worldwide to find alternative novel nano/submicron sized electrode materials.

In my talk, I will discuss our group studies on novel nano metal oxides, nitrides electrode materials and graphene/metal oxide composites. Specifically, i will focus V-based cathode materials: metal organic framework materials; nano- CoN, MO (M=Co,Ni, Cu, Mn), metal cluster compounds and Sn-based hollandties and Pyrochlore type structure.  Materials were prepared variety of chemical methods It includes Rf-sputtering, molten salt method, carbothermal/Graphenothermal reduction and ammonolysis methods.   Materials were characterized by Rietveld refinement X-ray diffraction, X-ray absorption spectroscopy, Raman, XPS, SEM, TEM, density and BET surface area methods. Electro analytical studies like cyclic voltammetry, galvanostatic cycling and electrochemical impedance spectroscopy techniques. Finally i will discuss in detail importance of electrode potentials and its reaction mechanisms and possible collaborative projects.

Event Date: 
Wednesday, December 12, 2018 -

Speaker: Dr. M.V. Venkatashamy Reddy

Department of Materials Science and Engineering and Physics National University of Singapore, Singapore

Wednesday 12, Dec 2018
11:00 AM - 12:00 PM