Studies on 3D Printed Nanocomposite Gel Polymer-Based Electrolyte for Li-ion Batteries

Recent developments in the field of mobile application and transport have heightened the need for efficient energy storage systems. Batteries are the most widespread energy storage systems for powering portable electronic devices and electric vehicles. Between them, the most used type of battery is Lithium-ion batteries. 3D printing of Li-ion batteries also known as secondary type batteries received vast recognition for advancing the next generation of 3D energy storage devices. Printing technologies offer simple processing and low-cost manufacturing, resulting in the potential replacement of conventional technologies. This thesis project is focused on the synthesis of a printable polymer-based electrolyte for Li-ion battery with a relative study of the 3D printing process, electrochemical and thermal properties of the electrolyte. The Poly (vinylidene fluoride-hexafluoropropylene) matrices and a Li+-conducting ionic-liquid salt are components of the hybrid polymer-based electrolyte developed in this study. To attain the desired rheological qualities of the electrolyte solution and improve the thermal properties of the electrolyte, the electrolyte ink composition was modified by adding Silane Boron-Nitride nanosized ceramic filler. Once verified the effective printability of the ink, a detailed analysis of the influence of the 3D printing machine dispensing parameters on the final printed structure was conducted. The overpotential and cyclability tests, performed to characterize the electrochemical properties, revealed interesting performances of the printed polymer electrolyte. Finally, the electrolyte enhanced thermal properties were demonstrated with a direct comparison between the 3D printed polymer electrolyte and a common liquid electrolyte. Nevertheless, further studies regarding the safety of the electrolyte can help to better understand the thermal runaway mechanism and serve as a source of inspiration for future work.