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采用化学气相沉积的方法合成了掺氮碳纳米管(N-CNTs)。相较于纯碳纳米管(CNTs),N-CNTs拥有更多结构上的缺陷,具有更高的导电性能,且硫在其表面的分布更加均匀,从而提升了掺氮碳纳米管/硫(N-CNTs/S)复合材料的性能。与纯碳纳米管/硫(CNTs/S)电极相比,N-CNTs/S电极在不同倍率下首放电比容量提升了近30%,在837.5 mA/g的电流密度下循环100圈后,放电容量的保持能力也更好。这表明氮掺杂提升了锂硫电池正极材料的电化学性能。
Nitrogen doped carbon nanotubes (N-CNTs) were synthesized by chemical vapor deposition. Compared with pure carbon nanotubes (CNTs), N-CNTs possess more structural defects, have higher conductivity, and the distribution of sulfur is more uniform on its surface, thereby enhancing the nitrogen doped carbon nanotubes / sulfur N-CNTs / S) composites. Compared with pure carbon nanotubes / sulfur (CNTs / S) electrode, the N-CNTs / S electrode increased the first specific discharge capacity by nearly 30% at different magnifications and after 100 cycles at a current density of 837.5 mA / g, Discharge capacity retention is also better. This indicates that nitrogen doping enhances the electrochemical performance of the cathode materials of lithium-sulfur batteries.