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Facile Preparation of High-Content N-Doped CNT Microspheres for High-Performance Lithium Storage

机译：用于高性能锂存储的高含量N掺杂CNT微球的简便制备

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摘要

Herein, high-content N-doped carbon nanotube (CNT) microspheres (HNCMs) are successfully synthesized through simple spray drying and one-step pyrolysis. HNCM possesses a hierarchically porous architecture and high-content N-doping. In particular, HNCM800 (HNCM pyrolyzed at 800 degrees C) shows high nitrogen content of 12.43 at%. The porous structure derived from well-interconnected CNTs not only offers a highly conductive network and blocks diffusion of soluble lithium polysulfides (LiPSs) in physical adsorption, but also allows sufficient sulfur infiltration. The incorporation of N-rich CNTs provides strong chemical immobilization for LiPSs. As a sulfur host for lithium-sulfur batteries, good rate capability and high cycling stability is achieved for HNCM/S cathodes. Particularly, the HNCM800/S cathode delivers a high capacity of 804 mA h g(-1) at 0.5 C after 1000 cycles corresponding to low fading rate (FR) of only 0.011% per cycle. Remarkably, the cathode with high sulfur loading of 6 mg cm(-2) still maintains high cyclic stability (capacity of 555 mA h g(-1) after 1000 cycles, FR 0.038%). Additionally, CNT/Co3O4 microspheres are obtained by the oxidation of CNTs/Co in the air. The as-prepared CNT/Co3O4 microspheres are employed as an anode for lithium-ion batteries and present excellent cycling performance.
机译：本文中，通过简单的喷雾干燥和一步热解成功地合成了高含量的N掺杂碳纳米管（CNT）微球。 HNCM具有分层的多孔结构和高含量的N掺杂。特别地，HNCM800（在800℃下热解的HNCM）显示出12.43at％的高氮含量。源自相互连接良好的CNT的多孔结构不仅提供了高度导电的网络，并在物理吸附中阻止了可溶性多硫化锂（LiPS）的扩散，而且还允许足够的硫渗透。富含N的CNT的加入为LiPS提供了强大的化学固定性。作为锂硫电池的硫基质，HNCM / S阴极具有良好的倍率性能和高循环稳定性。特别是，HNCM800 / S阴极在1000次循环后在0.5 C时可提供804 mA h g（-1）的高容量，对应于每循环仅0.011％的低衰落率（FR）。值得注意的是，高硫负载量为6 mg cm（-2）的阴极仍保持高循环稳定性（1000次循环后容量为555 mA h g（-1），FR为0.038％）。另外，CNT / Co3O4微球是通过空气中CNT / Co的氧化获得的。所制备的CNT / Co3O4微球被用作锂离子电池的阳极，并具有出色的循环性能。

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