NEES Teleseminars

Event Information

EFRC NEES Teleseminar: Paul Braun
Wednesday, July 15, 2015
4:00 p.m.-5:00 p.m.
UMD participants - AV Williams 2460
For More Information:
Elizabeth Lathrop
301 405 7801
lathrop5@umd.edu

EFRC NEES Monthly Teleseminar Series

Speaker: Paul Braun, Ivan Racheff Professor of Materials Science and Engineering at the University of Illinois at Urbana-Champaign

"New high energy and power chemistries and 3D mesostructured electrode designs for batteries"

Through mesoscale design of a 3D current collector, high power density and high energy density primary and secondary (rechargeable) batteries were fabricated. At the most fundamental level, mesostructuring enables optimization of the trade-off between energy and power density in energy storage systems due to unavoidable ohmic and other losses that occur during charge or discharge. Of course, it is at fast charge and discharge, where these effects are most important. By efficient design of the ion and electron transport pathways, we and others have shown it is possible to significantly improve the power-energy relationship. We have found a particularly effective way to provide these pathways is to use a colloidal-based template to form a mesostructured 3D current collector. The electrochemically active material is then deposited on this current collector. Using this approach, Li-ion batteries which could be discharged at up to 300C with 75% capacity retention were formed. The combination of a high surface area and short solid-state diffusion lengths offers a number of unique opportunities for both high energy and high power chemistries. As examples, we have formed conventional form-factor and microbattery high power cells based on lithiated manganese oxide and other oxide-based cathodes, and carbon, NiSn, iron oxide, and silicon-based anodes.

Paul V. Braun is the Ivan Racheff Professor of Materials Science and Engineering at the University of Illinois at Urbana-Champaign. Prof. Braun’s research focuses on the synthesis and properties of 3D architectures with a focus on materials with unique optical, electrochemical, thermal, and mechanical properties. Prof. Braun received his B.S. degree with distinction from Cornell University in 1993, and his Ph.D. in Materials Science and Engineering from Illinois in 1998. Following a postdoctoral appointment at Bell Labs, Lucent Technologies, he joined the faculty at Illinois in 1999. Prof. Braun has co-authored a book, authored about 200 peer-reviewed publications, been awarded multiple patents, and has co-founded two companies.

 

This Event is For: Graduate • Faculty • Post-Docs

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