SiO
2 has a much higher theoretical specific capacity (1965 mAh g
−1) than graphite, making it a promising anode material for lithium-ion batteries, but its low conductivity and volume expansion problems need to be improved urgently. In this work, pompon mum-like
[...] Read more.
SiO
2 has a much higher theoretical specific capacity (1965 mAh g
−1) than graphite, making it a promising anode material for lithium-ion batteries, but its low conductivity and volume expansion problems need to be improved urgently. In this work, pompon mum-like SiO
2/C nanospheres with the sandwich and porous nanostructure were obtained by using dendritic fibrous nano silica (DFNS) and glucose as matrix and carbon source, respectively, through hydrothermal, carbonization and etching operations. The influence of SiO
2 content and porous structure on its electrochemical performance was discussed in detail. The final results showed that the C/DFNS-6 with a SiO
2 content of 6 wt% exhibits the best electrochemical performance as a negative electrode material for lithium-ion batteries due to its optimal specific surface area, porosity, and appropriate SiO
2 content. C/DFNS-6 displays a high specific reversible capacity of 986 mAh g
−1 at 0.2 A g
−1 after 200 cycles, and 529 mAh g
−1 at a high current density (1.0 A g
−1) after 300 cycles. It also has excellent rate capability, with a reversible capacity that rises from 599 mAh g
−1 to 1066 mAh g
−1 when the current density drops from 4.0 A g
−1 to 0.2 A g
−1. These SiO
2/C specific pompon mum-like nanospheres with excellent electrochemical performance have great research significance in the field of lithium-ion batteries.
Full article