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Event Information MS. Thesis Defense: Sergio Baron Wednesday, August 1, 2012 3:30 p.m. Room 1146, AVW Bldg. For More Information: Maria Hoo 301 405 3681 mch@umd.edu ANNOUNCEMENT: MS. Thesis Defense Name: Sergio Baron Committee: Professor Reza Ghodssi, Chair/Advisor Professor Martin Peckerar Professor Chunsheng Wang Date/Time: Wednesday, August 1st, 2012, 3:30p.m. Location: Room 1146, AVW Building Title: A PLATFORM TOWARDS IN SITU STRESS/STRAIN MEASUREMENT IN LITHIUM ION BATTERY ELECTRODES Abstract: This thesis demonstrates the design, fabrication and testing of a platform for in situ stress/strain measurement in lithium ion battery electrodes. The platform – consisting of a Microelectromechanical System (MEMS) chip containing an electrochemical cavity and an optical sensing element, a custom electrochemical package and an experimental setup – was successfully developed. Silicon was used as an active electrode material, and a thin-film electrochemical stack was conceived and tested. Finally, multiple experiments showed correlation between the active material volume change inside the battery and a signal change in the optical sensing element. The experimental results, combined with the MEMS implementation of the sensing element provide a promising way to evaluate electrochemical reaction-induced stress monitoring in a simple and compact fashion, while experiments are carried out in situ. This Event is For: Graduate • Faculty

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