The most feasible way to achieve clean, efficient and sustainable development in the automotive and aviation sectors, in the long run, is the electrification of the powertrain. In the automotive industry, studies have shown that electric vehicles show promising growth to replace conventional internal combustion engines vehicles in the future progressively. The future development of electric vehicles relies on the advancement of battery technologies. Depending on the type of electric vehicles, the batteries are required to achieve high power or high energy capacity within a given space and weight and at a reasonable cost. Apart from meeting the performance requirements, rigorous safety control is also required for the batteries to operate and respond to a wide range of demanding circumstances such as extreme ambient temperature environment, charge and discharge failures as well as physical damage in crash scenarios. A paradigm shift from conventional lithium battery based on liquid electrolyte to solid-state lithium battery has the potential to mitigate safety concerns such as explosion due to thermal runaway. This project focuses on the modelling of solid-state lithium batteries.

Figure 1 (left) shows the preliminary simulation result of the mechanical model of a thin-film solid-state lithium-ion battery under bending. Figure 1 (right) illustrates that the mechanical model comprises of four layers: a ceramic substrate, a LiCoO2 positive electrode, a Lipon solid electrolyte and a Li negative electrode.

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Figure 1 (left): Preliminary simulation result of the mechanical model of a thin-film solid-state lithium ion battery under bending; Figure 1 (right): Different layers of the thin-film solid-state lithium-ion battery

PhD Student: Mei-Chin Pang