MIME Seminar - Understanding the Coupled Electrochemical-mechanical behavior of Materials

Friday, March 6, 2020
12:30 PM - 1:00 PM
Nitschke Hall 1027, SSOE Seminar Room
Event Type
College of Engineering
Contact
Kathryn Rose
419-530-8210
Link
http://calendar.utoledo.edu/EventDetails.aspx?EventDetailId=64730

Understanding the Coupled Electrochemical-Mechanical behavior of materials for Improving the Performance and Durability of Lithium Ion Batteries

Presented By: Yang-Tse Cheng, University of Kentucky

 

 Friday, March 6, 2020

1:00 – 2:00 PM

SSOE Seminar Room, NI 1027


Abstract:

With an increasing demand for higher energy and power density of lithium ion batteries (LIBs), the coupled electrochemical-mechanical degradation of electrode materials becomes a more pressing problem. In particular, fracture and delamination of electrodes can occur during repeated charging and discharging of LIBs. An improved understanding of the mechanical behavior of electrode materials, which often evolves with the state-of-charge and cycle number is therefore necessary for improving the performance and the durability of LIBs and other types of batteries. In this presentation, I will provide an overview of our recent work on using three complementary measurement techniques: (1) in situ electrochemical nanoindentation, (2) peel adhesion and cohesion test, and (3) electrode curvature measurement to help understand several coupled effects between mechanical and electrochemical behavior of materials on the performance and durability of high capacity electrodes. Examples include silicon/polymer porous composite electrodes, lithium metal electrodes, and ceramic materials for the positive electrode and solid-state electrolyte. These characterization techniques may also be used to investigate the coupled electrochemical-mechanical behavior of a wide range of electrochemical energy storage materials under realistic working conditions.

Bio:

YT Cheng is the Frank J. Derbyshire Professor of Materials Science and Professor of Physics and Astronomy (joint appointment) at the University of Kentucky. He graduated from the California Institute of Technology with a BS degree in physics/mathematics, and MS and Ph.D. degrees in applied physics. He has published more than 210 papers and holds 48 US patents. He is a Fellow of the American Physical Society, Materials Research Society, and National Academy of Inventors. His biographical information can be found at https://web.engr.uky.edu/~ycheng/.

Participation is mandatory for all MIME graduate students

Light refreshments will be served

Yang-Tse Cheng
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