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Characterization of Novel Electrolytes and Polymer Composite Filtration Materials

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When Oct 27, 2021
from 12:45 pm to 02:00 pm
Speaker Sophia Suarez Ph.D.
Speaker Information Dr. Sophia Suarez is a Professor in the Physics Department at Brooklyn College in the City University of New York (CUNY) and a member of the CUNY Graduate Center Doctoral Faculty in Physics. She received her BA/MA in Physics from Hunter College (1998) and her Ph.D. in Experimental Condensed Matter Physics from the CUNY Graduate Center (2004). After receiving her Ph.D., she spent two and a half years in the Chemistry Division at the US Naval Research Laboratory in Washington, DC, as a National Research Council (NRC) post-doc fellow developing the high-pressure NMR technique for the study of polymers. In 2016 she received a DOE Visiting Faculty Program summer fellowship to conduct research at the Center for Nanophase Materials Science (CNMS) at the Oak Ridge National Laboratory. In 2017 she received a German Academic Exchange Service (DAAD) Research Stay and a Karlsruhe Institute of Technology (KIT) Visiting Research Professor fellowship to conduct research at Helmholtz Institute Ulm (HIU) in Germany. Her research is focused on the use of NMR and Impedance Spectroscopy to study the ion and molecular transport in various types of materials, especially those with application in electrochemical devices such as non-lithium ion-based batteries.
Where Virtual
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When: Wednesday, Oct 27th, 2021, virtual coffee: 12:45 pm, colloquium: 1:00-2:00 pm

Where: https://us02web.zoom.us/j/84064498104?pwd=RUpEdHJUZU42cDVkNjNHR2RGUE5NUT09

Meeting ID: 840 6449 8104

Passcode: 488558

Abstract:

The growing worldwide demands for electrical energy have increased the need for large-scale storage devices. This is because current power grids lack the ability to accommodate the increasing energy generated from renewable resources and to provide for the energy demands of the world's population. Because of these, efficient large-scale battery storage systems are needed to supplement and strengthen the power capabilities of the existing grids. Two examples of emerging technologies are sodium- and aluminum- ion batteries (SIBs and AIBs). Both sodium and aluminum are cheap, relatively abundant and more air stable compared to lithium. To enable the commercialization of their batteries, optimization of their electrolytes is necessary. In an effort to aid in the development of more efficient electrolytes for both AIBs and SIIBs, we studied two sets of additive modulated electrolytes: (1) AlCl3 deep eutectic solvents (DESs) and (2) NaPF6 in mixtures of organic solvents.

In the first project the goals were to analyze their effects of carbonate solvent structure and polarity on the aluminum ion speciation, solvation and transport. Analysis of the short- and long- range interactions and dynamics show aluminum ion speciation in the DESs is dependent on several factors including the hydrogen bond donor (HBD) [1] and carbonate solvent type. In the case of the HBD, results show that alkyl chain length is a determining factor with resulting local dynamics being affected by the alkyl chain's ability to adapt cis and trans conformations.
In the second project our goals were to analyze the effect of the fluoroethylene carbonate additive on the interactions and solvation of the Na+. Results show significant temperature independent ion association facilitated by the solvent polarity as determined from the NMR D measurements [2]. These and other results will be highlighted during the seminar.

References:

  1. Aluminum ions speciation and transport in acidic deep eutectic AlCl3 amide electrolytes, J. Molecular Liquids, 319,114118, 2020.
  1. Transport studies of organic solvents-based sodium ion electrolytes, Electrochimica Acta, 377,138062, 2021.
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