SYNTHESIS OF PORE STRUCTURED SIOX/C DERIVED FROM BRACHIARIA MUTICA AS ANODE IN LITHIUM-ION BATTERY

• Main Author: Aini, Quratul
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/73454
• Institution: Institut Teknologi Bandung

<p align="justify">Lithium-ion batteries (LIBs) are one of the energy storage systems widely used in various electronic devices. The performance of LIBs can be significantly enhanced by selecting appropriate anode and cathode materials. Silicon oxide (SiOx) has emerged as a promising silicon-based anode material due to its ease of synthesis, cost-effectiveness, and high theoretical capacity (2680 mAh g-1). However, its practical application as an anode faces challenges such as low electrical conductivity and significant volume expansion (200%). To address these challenges, researchers have explored the of SiOx with a porous carbon matrix. The inclusion of a porous carbon matrix in the serves as a conductive and flexible host, improving electrical conductivity and mechanical stability during the lithium-ion insertion and extraction processes. In terms of sustainability and cost-efficiency, SiOx/C can be derived from biomass sources. Among these sources, Brachiaria mutica, a type of grass, shows potential as a sole source for silicon oxide and carbon, which can be utilized as anodes in LIBs. By employing ZnCl2 as an activator and conducting a one-step high-temperature calcination in an inert gas environment, SiOx/C with high carbon content (~89.51%) and a porous structure, featuring a surface area of approximately 1235 m2 g-1, have been successfully synthesized. Half-cell configuration of SiOx/C-B. mutica anode demonstrated specific capacities of 716 and 299 mAh g-1 at 200 and 1000 mA g-1, respectively, while retaining 74% of its capacity after 200 cycles with a coulombic efficiency of 99%. Moreover, in a full-cell configuration of LFP||SiOx/C-B. mutica, the exhibited a specific capacity of 89 mAh g-1 at 125 mA g-1 and retained 81% of its capacity after 150 cycles. The SiOx/C-B. mutica anode with high carbon content and porous structure demonstrated high stability and performance in LIBs.