Development and synthesis of silicon-based nanomaterials for lithium-ion battery anodes

Duman, Mehmet Nevzat
The advancement of lithium-ion batteries has significantly facilitated the widespread integration of portable electronic devices and electric vehicles. However, current electrode materials have reached their performance limits, prompting the need for active materials with higher energy density, particularly in the context of the future development of electric vehicles. Silicon, with its remarkable lithium-ion storage capacity, stands out as a promising alternative for the anode. Nevertheless, the commercialization of silicon faces challenges related to electrode material pulverization caused by substantial volume fluctuations during charge and discharge, leading to poor cycle stability. To address this issue, porous silicon nanostructures emerge as a promising solution capable of accommodating volume expansion and mitigating associated stress. This thesis introduces a facile and cost-effective synthesis method of mesoporous silicon particles (PSI) via utilizing a clay mineral as a raw material in the initial phase. It then presents a novel approach for the scalable fabrication of porous silicon/graphite/carbon nanocomposites (SGC). Synthesis parameters for both class of materials were optimized based on the electrochemical performance of the resulting products. Structural characterization involved XRD, SEM, FT-IR spectroscopy, and N2 physisorption analysis, while electrochemical characteristics were assessed using EIS, galvanostatic charge/discharge, and CV techniques.
Citation Formats
M. N. Duman, “Development and synthesis of silicon-based nanomaterials for lithium-ion battery anodes,” M.S. - Master of Science, Middle East Technical University, 2024.