【摘要】 提高碳材料中氮的掺杂含量,尤其是吡啶氮的含量,已被证明可以显著提升锂硫（Li-S）电池的性能.尽管在碳材料中氮掺杂具有积极作用,但在实际操作中要实现>5 at.%的高氮掺杂含量仍非易事.此外,无法调节碳材料中特定的氮种类也是研究中的一个难题.在本文中,我们通过在氩气气氛下煅烧预先经过磷化处理的泛酸钙,得到了一种三维蜂窝状的氮（N）掺杂介孔碳（PNMC）,其N掺杂含量高达8.82 at.%（吡啶N含量为3.49 at.%）.磷掺杂不仅有助于提高N掺杂量,还有助于提升对多硫化物的吸附能力.实验证明,在800℃下制备的PNMC组装的硫正极（S/PNMC-800）表现出优异的电化学性能,在1 C下经过300圈循环后仍有556.7 mA h g^-1放电比容量.本工作提出了一种调控碳材料中吡啶氮含量的简便方法,为用于锂硫电池的多功能硫载体材料的开发提供启发.更多还原

【Abstract】 Increasing the amount of the nitrogen dopant,especially pyridinic-N species,in carbonaceous materials has been shown to significantly enhance the performance of lithium-sulfur（Li-S） batteries.Despite the positive impact of N doping on carbonaceous materials,the practical realisation of a high N dopant content of>5 at.% remains a significant challenge.Furthermore,to regulate the specific N species in carbonaceous materials is another hurdle.Herein,we obtained a three-dimensional honeycomb-like N-doped mesoporous carbon（PNMC） material with a high N dopant content of 8.82 at.%（pyridinic-N content,3.49 at.%） by calcining calcium pantothenate under an Ar atmosphere after a phosphorisation process.It is believed that the P dopant contributes to the enhancement of not only the N content but also the polysulfide adsorption capability of the N dopant.As expected,the sulfur cathode comprising PNMC prepared at 800℃（S/PNMC-800） exhibited superior electrochemical performance as confirmed by the discharge specific capacity of 556.7 mA h g^-1 observed after 300 cycles at 1 C.This study proposes a facile regulation technique to dope pyridinic-N species in carbonaceous materials,which may trigger the future inventive development of functional S hosts for use in Li-S batteries.更多还原