<p dir="ltr">Li-ion batteries are ubiquitous in today’s world with portable electronics, EVs making inroads into daily lives, and electric aircraft at the cusp of becoming reality. These and many more applications revolutionize the world with improvements in batteries at scales from materials, manufacturing, electrode architectures, cell design, and protocols. The various challenges associated with the current generation of batteries include the fast-charging capabilities, economic return of the longevity of the battery, and thermal safety characteristics. The aging and degradation of LIBs appears to be a key pain point particularly when exposed to harsh operating temperature and fast charging conditions. LIBs undergo aging due to numerous chemical and physical degradation processes throughout their lifetime owing to their operation. These challenges are exacerbated by the presence of stringent operating conditions including extreme fast charging, and sub-zero temperature resulting in severe degradation and short cycle life. The LIBs also face challenges in their thermal stability characteristics, failing catastrophically when exposed to high temperature or mechanical abuse conditions. The onset and intensity of these thermal runaway behaviors are further modified when batteries undergo varied aging leading to increased heat and gas generation potentially causing fire or explosions. Overall, a comprehensive characterization to delineate the interconnected role and implications of operating extremes and electrode design on electrochemical performance, cell aging, and thermal runaway behavior is critical for better batteries. </p><p dir="ltr">To this end, the role of electrode microstructure in mitigating lithium plating behavior under various operating conditions, including extreme fast charging has been examined. Further, these multi-length scale characteristics of the electrode microstructure are explored via data-driven approaches to study the complex interaction of transport and kinetic limitations on the microstructure designs. A third study is undertaken for in-operando characterization of the LIB degradation, probing the multi-length scale degradation using pulse voltammetry. Here an accurate degradation descriptors dataset is identified and accurately parametrized, throughout its cycling lifespan. These aging behaviors are translated to physio-chemical degradation mechanisms via a reduced-order coupled electrochemical-thermal-aging interactions model. Lastly, the implication of aging behavior on thermal-safety interactions is delineated. Overall the dissertation is focused on developing a fundamental understanding of the LIB performance, degradation, and safety interactions.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/24722613 |
| Date | 04 December 2023 |
| Creators | Venkatesh Kabra (10531817) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/thesis/PHYSICS_BASED_DEGRADATION_ANALYTICS_IN_ENERGY_STORAGE/24722613 |
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