CALCE Webinar - Effects of Rest Time and Temperature on Li-ion Battery Degradation

Tuesday, January 28, 2020
11:00 a.m.-12:00 p.m.

Saurabh Saxena
Tuesday, January 28, 2020 11:00 am US EDT

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Abstract

Performance and reliability of Lithium-ion batteries are affected by various operational and environmental conditions, including temperature, discharge and charge C-rate, and depth of discharge. Another factor is the rest period after charge which has not been given due attention in the literature despite its relevance in the actual life cycle conditions of batteries. We investigate the effects of rest period after charge operation on the capacity fade behavior of high voltage graphite – LiCoO2 (LCO) pouch batteries which are being used in portable electronic applications. Tests have been conducted at 3 different temperature levels to also understand the interaction of rest time with temperature. Tradeoffs associated with introducing rest periods in cycle testing of batteries in terms of accelerating the life testing procedure have also been studied. The failure mechanisms have been identified using differential voltage analysis (DVA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX).

About the Presenter: Saurabh Saxena received the B.Tech. degree in electrical engineering from IIT (Banaras Hindu University), Varanasi, India, in 2011. He is currently pursuing the Ph.D. degree with the CALCE Center, University of Maryland at College Park. He was a Project Assistant with IISc Bangalore, India for 10 months on a project related to the modeling of Li-ion batteries and ultracapacitors. He has been involved in various battery projects for last five years. His research interests include the design of battery management systems and failure analysis, testing, reliability, safety, and the prognostics of lithium-ion batteries. Mr. Saxena is being advised by Professor Michael Pecht.

 

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