Home > CBE Graduate Student Presentations: Mark Summe, Hunter Ford

CBE Graduate Student Presentations: Mark Summe, Hunter Ford

Start:

10/26/2017 at 12:30PM

End:

10/26/2017 at 1:30PM

Location:

138 DeBartolo Hall

Host:

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William Schneider

William Schneider

VIEW FULL PROFILE Email: wschneider@nd.edu
Phone: 574-631-8754
Website: http://www.nd.edu/~wschnei1/
Office: 123B Cushing Hall

Affiliations

Department of Chemical and Biomolecular Engineering H. Clifford and Evelyn A. Brosey Professor of Engineering
College of Engineering H. Clifford and Evelyn A. Brosey Professor of Engineering
The goal of research in the Schneider group is to develop molecular-level understanding, and ultimately to direct molecular-level design, of chemical reactivity at surfaces and interfaces. This heterogeneous chemistry is a key element of virtually every aspect of the energy enterprise, and is ...
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Best Poster Awardees from the CBE Graduate Research Symposium will share their work in the department seminar series.

Hunter Ford: Crosslinked Ionomer Films For Use As Magnesium Sulfur Battery Cathode Coatings

The development of new battery systems employing novel chemistries is imperative to meet the increasing energy storage demands of emerging technologies. Magnesium anode and sulfur cathode batteries are one potential solution, offering a theoretical energy density of 2300 Wh/kg, a roughly tenfold increase relative to current lithium ion batteries. However, Mg/S cells suffer poor performance due to what is known as the polysulfide shuttling effect. Magnesium polysulfide compounds formed in the cathode shuttle to the magnesium metal anode, onto which they irreversibly adsorb. The resultant passivating layer decreases cell capacity and leads to premature cell failure. For use as a polysulfide restricting cathode coating, various ionomers (polymers containing covalently tethered anion-cation pairs) were fabricated via UV initiated radical polymerization. The resultant crosslinked ionomers were ion exchanged to magnesium or lithium forms, and the effects of monomer chain length, cation-anion pairs, and swelling solvent on the ionic conductivity and structure were studied via dielectric spectroscopy and small angle x-ray scattering (SAXS), respectively. The highest room temperature dry magnesium ionomer conductivity was 5.6 x 10-8 S/cm, while the highest conductivity in a DMSO swelled state was 4.4 x 10-4 S/cm. The use of SAXS elucidated the conditions that allowed for the formation of dense ionic aggregates that hinder cation transport. Ongoing studies seek to relate the diffusion of polysulfide species through the ionomers to structural features obtained from SAXS, and identify ionomer compositions that are both adequately conductive and capable of restricting polysulfides. Selected ionomer coatings will then be tested in Mg/S cells to study the impact of the coating on performance.

Seminar Speaker:

Mark Summe & Hunter Ford

University of Notre Dame

Hunter Ford, Schaefer Group

Hunter Ford is beginning his second year as a graduate student in Dr. Jennifer Schaefer’s research group, and is researching the development of materials for use in rechargeable battery systems. He received his B.S. in chemical engineering and B.A. in chemistry from Hope College in Holland, Michigan. Previous research efforts have included synthesis and electro-polymerization of sensor coatings for use in heavy metal detection, and development of a colorimetric smart-phone based assay for detection of aqueous mercury. After graduating from Hope College Hunter worked in a product engineering role at Haworth Inc., a global office furniture manufacturing company, before attending Notre Dame in 2016.

Mark Summe, Phillip Group