SILICON-CARBON COMPOSITE FROM GEOTHERMAL INDUSTRIAL SILICA SCALE WASTE AS LITHIUM-ION BATTERY ANODE

• Main Author: Fajri Rahmadiesa Dzikra, M
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/80098
• Institution: Institut Teknologi Bandung

Lithium-ion batteries are among the most widely used types of batteries. Typically, lithium-ion batteries use graphite as their anode. Graphite has advantages such as high lifespan and stability, but it has a low theoretical capacity of 372 mAh/g. This leaves room for improving the performance of lithium-ion battery anodes. Silicon has become one of the materials used as a lithium-ion battery anode because it has a much larger theoretical capacity of 4200 mAh/g. However, silicon undergoes volume expansion (300%), leading to silicon pulverization. Pulverization promotes the continuous formation of a solid electrolyte interface. In this study, geothermal waste silica is utilized as an underutilized source of alternative silicon. Silicon is obtained by reducing geothermal waste silica through the magnesiothermic process. The obtained silicon is engineered to form submicron-sized silicon. Subsequently, this silicon is coated with a metal-organic framework to provide morphology to the created layer. Carbonization is then carried out to obtain a nitrogen-doped carbon layer. Silicon coated with nitrogen-doped carbon enhances its conductivity and stability, helping to prevent pulverization. Silicon coated with nitrogen-doped carbon exhibits several distinct characteristics, including flake morphology, better stability, improved rate capability, and a smaller impedance as indicated by electrochemical impedance spectroscopy (EIS) results.