PHOSPHORUS-DOPED SILICON COATED BY NITROGEN-DOPED CARBON ANODE FOR HIGH-RATE AND STABLE LITHIUM-ION BATTERIES

• Main Author: Muhammad Firdaus, Arief
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/77102
• Institution: Institut Teknologi Bandung

The demand for high-capacity and long-lasting batteries is increasing due to the need for energy storage in renewable energy sources and electric vehicles. Silicon (Si) has great potential as a high-capacity anode material for lithium-ion batteries (LiBs). However, its performance is hindered by rapid capacity degradation and low-rate capability. In this study, LiBs anode from phosphorus-doped silicon coated by nitrogen-doped carbon (P-Si@N-C) were fabricated by ball-milling, polymerization, and calcination. The combination between P doping and N-doped carbon coating provides improved stability and fast charge-transfer kinetics in both the base property of the silicon and the overall anode. This results in a high-rate anode with long-term stability. The electrode shows excellent high-rate stability, which can retain 91.49% of its first-cycle capacity of 1238 mAh g?1 after 140 cycles at the current density of 4000 mA g?1. Furthermore, the P-Si@N-C||LFP lithium-ion full cell also demonstrated a good performance, which displays an excellent capacity retention of 93.49% of its first-cycle capacity of 109.46 after 100 cycles at 1 C. These results prove the potential of P-Si@N-C as a promising composite anode for lithium-ion batteries with high capacity, stability, and power density.