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Complete your application – Enter the rest of the information required for the IC Postdoc Program Research Opportunity. The application itself contains detailed instructions for each one of these components: availability, citizenship, transcripts, dissertation abstract, publication and presentation plan, and information about your Research Advisor co-applicant.
Additional information about the IC Postdoctoral Research Fellowship Program is available on the program website located at: https://orise.orau.gov/icpostdoc/index.html.
If you have questions, send an email to ICPostdoc@orau.org. Please include the reference code for this opportunity in your email.
Research Topic Description, including Problem Statement:
Li-ion batteries have become indispensable in modern life and have enabled a plethora of portable devices such as cell phones and drones due to their high energy density. Li-ion batteries are poised to revolutionize the transportation sector with major automakers announcing a complete switch from internal combustion engines to battery electric vehicles (BEV), as such the BEV market share is projected to be about 20% of all new car sales globally by 20301.
Due to the increased run-time or reduction in size/weight, the military and Intelligence Community (IC) have also become reliant on high-energy Li-ion batteries to power their equipment. However, there is a safety drawback with Li-ion batteries. The energetic lithiated anode and the highly flammable organic electrolyte typically present in Li-ion batteries have resulted in several safety incidents, such as BEV fires reported to occur spontaneously1, overheating of the Boeing 787 Dreamliner auxiliary power unit battery2 and a battery fire within the Navy's Advanced SEAL Delivery Vehicle (ASDS)3.
Due to the requirement to increase safety of large battery packs with multiple cells in series and parallel, typical battery packs in BEVs may exhibit energy densities of only ~120 Wh/kg and ~200 Wh/L, whereas Li-ion on the cell level can exhibit up to ~250 Wh/kg and ~650 Wh/L.
The large reductions in energy densities are in part a result of increasing safety. However, an individual cell can still fail in an unsafe manner, this has to be managed to prevent propagation throughout an entire battery pack. Notable work to develop propagation-resistant batteries was done by NASA. NASA found that in 18650 cells there was a high propensity to side wall ruptures. To prevent propagation of failure, a pack design included increased cell spacing, interstitial heat sinks, individual cell fusing and flame arresting vent ports, which impacts size and weight4.
The aim of this topic is to develop fundamental understanding of the materials and cell parameters that affects a passive propagation-resistant battery pack in order to realize energy densities close to the cell level but retain the safety features shown in the NASA propagation-resistant battery pack.
Example Approaches:
Relevance to the Intelligence Community:
In many applications the IC users require large battery packs, be that for drones, military applications, intermittent mains power, and extended run time for existing devices. Safety in any large system is always paramount. If this project is successful, the understanding can contribute to developing and building a passive propagation-resistant Li-ion battery pack exhibiting 200-250 Wh/kg and 400-500 Wh/L.
References:
Key Words: Batteries, Battery Packs, Lithium, Li-ion, Safe, Propagation Resistant, Passive, Energy, Density
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