The first week focuses on the growing significance of electrochemical energy storage systems utilizing lithium-ion technology. It introduces the fundamental principles of their chemical and physical operations, outlining the essential components that constitute these systems. Additionally, the week defines critical formulation parameters necessary for optimizing performance. It provides general definitions related to energy generation classification, including commercial formulations that are currently available on the market. Furthermore, it emphasizes key performance indicators that measure the effectiveness and efficiency of these systems, alongside their various technological applications in sectors such as automotive, renewable energy, and consumer electronics. Thus, a comprehensive understanding of lithium-ion systems is established, highlighting their pivotal role in energy storage advancements.