Si/ CNTs @melamine‐formaldehyde resin‐based carbon composites and its improved energy storage performances

In this paper, Si/carbon nanotubes@melamine‐formaldehyde resin (MFR)‐based carbon (Si/CNTs@C) composites have been fabricated by surface modification, electrostatic self‐assembly, cross‐linking of MFR under hydrothermal treatment and further carbonization. The microstructure of the Si/CNTs@C composites was characterized, and the effects of CNTs content in Si/CNTs@C composites on their electrochemical performances were also investigated in detail. The results indicate Si/CNTs@C composites as anode materials of Li‐ion batteries exhibit better high‐rate and cycling performances compared to Si and Si@MFR‐based carbon composites. Notably, Si/CNTs@C composites with 10.4 wt% CNTs show specific capacities of 1900, 1879, 1,688, 1,394, 1,189 mAh·g −1 at 0.2, 0.5, 1, 2, and 3 A·g −1 , respectively. Even at 4 and 5 A·g −1 , their capacities still reach 970 and 752 mAh·g −1 , respectively. Moreover, they deliver a reversible capacity of 1,184 mAh·g −1 at 0.5 A·g −1 after 100 cycles. Therefore, the reasonable structure is of great significance for enhancing the electrochemical performances of Si‐based composites.