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首页> 外文期刊>Chemistry: A European journal >Nitrogen-Doped Hollow Amorphous Carbon Spheres@Graphitic Shells Derived from Pitch: New Structure Leads to Robust Lithium Storage
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Nitrogen-Doped Hollow Amorphous Carbon Spheres@Graphitic Shells Derived from Pitch: New Structure Leads to Robust Lithium Storage

机译：沥青衍生的氮掺杂空心无定形碳球@石墨壳：新结构导致稳健的锂存储

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摘要

Nitrogen-doped mesoporous hollow carbon spheres (NHCS) consisting of hybridized amorphous and graphitic carbon were synthesized by chemical vapor deposition with pitch as raw material. Treatment with HNO3 vapor was performed to incorporate oxygen-containing groups on NHCS, and the resulting NHCS-O showed excellent rate capacity, high reversible capacity, and excellent cycling stability when tested as the anode material in lithium-ion batteries. The NHCS-O electrode maintained a reversible specific capacity of 616mAhg(-1) after 250 cycles at a current rate of 500mAg(-1), which is an increase of 113% compared to the pristine hollow carbon spheres. In addition, the NHCS-O electrode exhibited a reversible capacity of 503mAhg(-1) at a high current density of 1.5Ag(-1). The superior electrochemical performance of NHCS-O can be attributed to the hybrid structure, high N and O contents, and rich surface defects.
机译：通过化学气相沉积法，以沥青为原料，合成了由杂化无定形和石墨碳组成的氮掺杂介孔中空碳球（NHCS）。进行了HNO3蒸气处理，以在NHCS上引入含氧基团，当作为锂离子电池的负极材料进行测试时，所得NHCS-O显示出优异的倍率容量，高可逆容量和出色的循环稳定性。 NHCS-O电极在250次循环后以500mAg（-1）的电流速率保持了616mAhg（-1）的可逆比容量，与原始的空心碳球相比增加了113％。此外，NHCS-O电极在1.5Ag（-1）的高电流密度下具有503mAhg（-1）的可逆容量。 NHCS-O的优异电化学性能可归因于杂化结构，高N和O含量以及丰富的表面缺陷。

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