Abstract:
The strong π—π bond interactions between aromatic molecules in asphalt can lead to the formation of a high degree of graphitization of soft carbon when asphalt is directly carbonized. However, the narrow carbon interlayer spacing and poor pore structure result in low sodium storage capacity. To address the problem of low sodium storage capacity caused by narrow interlayer spacing and few pore structures in asphalt derived carbon materials, hybrid perovskite and coal tar pitch are blended and carbonized to prepare carbon composite materials. The catalytic effect of hybrid perovskite on asphalt and the sodium storage capacity of alloy nanoparticles derived from hybrid perovskite are utilized to enhance the electrochemical performance of carbon composite materials. The influences of hybrid perovskite type and precursor ratio on the microstructure and sodium storage performance are investigated. When used as the negative electrode of sodium-ion batteries, the sodium storage capacity is effectively improved, and the carbon composite material exhibits a reversible capacity of 173.2 mAh·g
−1, with a capacity retention rate of 85% after 100 cycles. This hybrid perovskite/pitch derived carbon composite material provides a new strategy for preparing asphalt carbon materials.