Understanding the Coupled Electrochemical-Mechanical Behavior of Materials for Improving the Performance and Durability of Lithium-Ion Batteries

All dates for this event occur in the past.

Scott Lab E525
201 W. 19th Avenue Columbus, OH 43210
Columbus, OH 43210
United States

Speaker: Yang-Tse Cheng, University of Kentucky

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 durability of LIBs and other types of batteries. In this presentation, I will provide an overview of our recent work on using four complementary measurement techniques: (1) electrochemical nanoindentation, (2) scanning probe microscopy, (3) peel adhesion and cohesion test, and (4) 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, polymeric binders, 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 materials for lithium-ion batteries and beyond.

Bio: YT Cheng is a Professor of Materials Engineering and Professor of Physics and Astronomy (joint appointment) at the University of Kentucky where he has worked since 2008. Previously, he was a Technical Fellow and Laboratory Group Manager for Engineered Surfaces and Functional Materials at the General Motors Research and Development Center. His research activities cover topics such as small scale mechanical property measurements; growth, structure, and properties of nanostructured materials; microscopic shape memory and super-elastic effects; magnetorheological fluids; superhydrophobic surfaces; ion beam modification of materials; automotive applications of new materials and processes, including electrical contacts, high power-density engines and transmissions, environmentally friendly machining processes, hydrogen sensors, fuel cells, metal hydride batteries, and lithium ion batteries. He graduated from the California Institute of Technology with a BS degree in physics/mathematics, and MS and PhD degrees in applied physics. He has published more than 260 papers and holds 49 US patents. He is a Fellow of the American Physical Society, Materials Research Society, and National Academy of Inventors (https://web.engr.uky.edu/~ycheng/) .

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