[CCoE Notice] Defense Announcement: Investigation of Thermal Runaway Suppression in Polymer-Based Lithium Ion Batteries

[Knudsen, Rachel W]

Defense Announcement

Investigation of Thermal Runaway Suppression in Polymer-Based Lithium Ion Batteries



Abdul Rahman Saddiq

Degree: MS, Mechanical Engineering

Date: 11/25/2019

Time: 2:45pm

Location: IE Conference Room E214

Committee Chair:                 Dr. Haleh Ardebili

Committee Members:            Dr. Gangbing Song

                                                Dr. Rose Faghih

Abstract



Thermal runaway occurs when cell temperature reaches a point where self-heating exceeds the cell’s ability to dissipate the generated heat. This event is well-known in lithium ion batteries (LIBs) containing conventional organic liquid electrolytes and can potentially lead to fire hazards and catastrophic failures due to temperature build caused by exothermic reactions. Solid polymer electrolyte (SPE) based batteries offer many advantages including safety, stability and mechanical flexibility. However, the thermal behavior of SPE-based thin-film LIBs is not currently modeled. In this study, we develop a simple lumped-parameter model that takes into account the distinctive behavior of solid polymer electrolytes to assess the thermal behavior of LIBs. Our modeling effort is complemented by thermal gravimetric analysis experiments on a specific solid polymer electrolyte (polyethylene oxide—PEO 100k Mw) used in flexible thin-film batteries. Our unprecedented conclusion is that no thermal runaway occurs even at elevated temperatures in the SPE thin film flexible batteries, which suggests very wide range of sensitive applications. In addition, the improved models and experiments are used to note several important physical insights and recommendations for future design against thermal runaway.

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