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MEAM Seminar: “Mechanics for Energy Sustainability: From Fatigue of 2D Materials to Dendrites in Solid-state Batteries”

February 23, 2023 at 10:00 AM - 11:30 AM

Achieving energy sustainability requires efforts from not only sourcing clean energy, but also storing and dispatching energy whenever and wherever needed, as well as being energy-efficient whenever possible. Two-dimensional (2D) materials hold great promises as mechanical reinforcement in high strength-to-weight ratio structural materials and as next-generation energy-efficient electronic materials, both of which contribute to less energy consumption with improved performance. Among energy-storage technologies, solid-state batteries (SSB) are particularly attractive due to potentially higher energy density and safer non-flammable solid electrolytes compared with conventional lithium-ion batteries. However, both 2D materials and components of SSB are often exposed to static and dynamic mechanical stresses, posing critical challenges towards their wide applications. The first part of the talk will discuss the mechanical fatigue behavior of 2D materials and their interfaces, reveal their unconventional failure mechanisms, and propose practical strategies to improve their mechanical reliability. The second part will focus on the lithium dendrite issues in SSB and discuss the coupled electro-chemo-mechanical effect in the failure of a garnet solid electrolyte. Through in-situ FIB/SEM experiments, the critical role of stress in regulating the failure of SSB during fast charging is revealed.

Teng Cui

Postdoctoral Scholar, Department of Mechanical Engineering, Stanford University

Dr. Cui is currently a NSERC Postdoctoral Fellow in Department of Mechanical Engineering at Stanford University working with Prof. Wendy Gu and Prof. William Chueh on electro-chemo-mechanics of solid-state batteries. Prior to joining Stanford, Dr. Cui obtained his Ph.D. (co-advisors: Prof. Tobin Filleter and Prof. Yu Sun) in Department of Mechanical and Industrial Engineering at the University of Toronto where he investigated nanomechanics of 2D materials with the focus on fatigue and fracture. Dr. Cui aims to apply his diverse research background and expertise spanning solid mechanics, nanomaterials, and electrochemistry to solve grand societal challenges related to energy-efficient materials and energy storage.

Details

Date:
February 23, 2023
Time:
10:00 AM - 11:30 AM
Event Category:
Event Tags:

Organizer

Mechanical Engineering and Applied Mechanics
Phone
215-746-1818
Email
meam@seas.upenn.edu
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Venue

Glandt Forum, Singh Center for Nanotechnology
3205 Walnut Street
Philadelphia, PA 19104 United States
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