【摘要】 以聚苯乙烯为模板,聚吡咯为炭前驱体,制备出尺寸均匀的氮掺杂空心炭球（NHCs）。通过N₂吸脱附曲线、X射线光电子能谱、X射线衍射、扫描电子显微镜、透射电子显微镜和循环伏安法等测试方法考察了炭化温度对空心炭球的微观结构与电化学性能的影响。结果表明,制备的空心炭球直径在160 nm左右,氮原子百分含量达到9.69%。0.5 A·g^-1的电流密度下,800℃炭化所得空心球经过200次循环可逆容量达到493.4 mA·h·g^-1,容量保持率为84%;在5 A·g^-1的电流密度下,经过1000次循环,可逆容量仍高达265.2 mA·h·g^-1。说明所制备的空心球拥有高的可逆容量、良好的倍率性能和长的循环寿命,是一种优异的储锂材料。更多还原

【Abstract】 Nitrogen-doped hollow carbon spheres（NHCs） were synthesized by using polypyrrole as nitrogen-enriched precursor and polystyrene sphere as template. The morphologies and electrochemical properties of the as-prepared materials were characterized by BET, XPS, XRD, SEM, TEM, and cyclic voltammetry. Results showed that the diameter of the hollow carbon spheres was about 160 nm, and the nitrogen atom content reached 9.69%. When used as anode material of lithium-ion batteries, the NHCs exhibit excellent Li-storage performance. The NHCs carbonized at 800 ℃, gained a reversible specific capacity of 493.4 mA·h·g^-1 with a retention of 84% after 200 cycles at 0.5 A·g^-1, and a retention capability of 265.2 mA·h·g^-1 after 1000 cycles at 5 A·g^-1. It shows that NHCs have high reversible capacity, preeminent rate performance and long cycle life, which can be an excellent lithium storage material.更多还原