【摘要】 以聚丙烯腈（PAN）中空炭纤维为基体，通过KOH活化法制备了PAN中空多孔炭纤维用于锂硫电池正极材料基体。中空炭纤维经活化得到2 491 m²·g^-1的高比表面积和1.22 cm³·g^-1的大孔隙体积。为了进一步提高电化学性能，使用水合肼对纤维前体进行了改性，以制备氮掺杂的中空多孔炭纤维。修饰后的纤维拥有1 690 m²·g^-1的比表面积，0.84 cm3·g-1的孔隙体积和8.81 at%的高氮含量。由于含氮基团可以增加纤维表面极性和吸附能力，所以在电流密度为1 C时，其起始比容量可以提升至到420 m Ah·g^-1。更多还原

【Abstract】 Hollow porous carbon fibers for Li-S battery electrodes were prepared by the KOH activation of carbon prepared from hollow polyacrylonitrile fibers.The fibers had a high specific surface area of 2 491 m²·g^-1,a large pore volume of 1.22 cm³·g^-1 and an initial specific capacity of 330 m Ah·g^-1 at a current density of 1 C.To improve their electrochemical performance,the fibers were modified by treatment with hydrazine hydrate to prepare nitrogen-doped hollow porous carbon fibers with a specific surface area of 1 690 m²·g^-1,a pore volume of 0.84 cm³·g^-1 and a high nitrogen content of 8.81 at%.Because of the increased polarity and adsorption capacity produced by the nitrogen doping,the initial specific capacity of the fibers was increased to 420 m Ah·g^-1 at a current density of 1 C.更多还原