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<b><span style="font-size:16.0pt">Defense Announcement</span></b></p>
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<i><span style="font-size:12.0pt;
font-family:"Times New Roman",serif;color:black">Investigation of Thermal Runaway Suppression in Polymer-Based Lithium Ion Batteries</span></i></p>
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color:black"><o:p> </o:p></span></p>
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<span style="font-size:11.5pt;font-family:"Times New Roman",serif;
color:black">Abdul Rahman Saddiq</span></p>
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<b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black">Degree:</span></b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black"> MS, Mechanical Engineering</span></p>
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<b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black">Date:</span></b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black"> 11/25/2019</span></p>
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<b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black">Time:</span></b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black"> 2:45pm</span></p>
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<b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black">Location:</span></b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black"> IE Conference Room E214</span></p>
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<b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black">Committee Chair:<span style="mso-tab-count:2">
</span></span></b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black">Dr. Haleh Ardebili</span></p>
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<b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black">Committee Members:</span></b><span style="font-size:11.5pt; font-family:"Times New Roman",serif; color:black"><span style="mso-spacerun:yes">
</span><span style="mso-tab-count:1"> </span>Dr. Gangbing Song</span></p>
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<span style="font-size:
11.5pt; font-family:"Times New Roman",serif; color:black"><span style="mso-tab-count:4">
</span>Dr. Rose Faghih </span></p>
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<span style="font-size:16.0pt">Abstract </span></p>
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<span style="font-size:16.0pt"><o:p> </o:p></span></p>
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<span style="font-size:11.5pt">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.</span></p>
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