Facile Synthesis of Nitrogen-Doped Double-Shelled Hollow Mesoporous Carbon Nanospheres as High-Performance Anode Materials for Lithium Ion Batteries,ACS Sustainable Chemistry & Engineering

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Facile Synthesis of Nitrogen-Doped Double-Shelled Hollow Mesoporous Carbon Nanospheres as High-Performance Anode Materials for Lithium Ion Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-03-20 00:00:00 , DOI: 10.1021/acssuschemeng.7b04617
Chuanpeng Xu ₁ , Dechao Niu ₁ , Nan Zheng ₁ , Haining Yu ₁ , Jianping He ₁ , Yongsheng Li ₁

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In this work, a facile “soft-template” route to synthesize nitrogen-doped double-shelled hollow mesoporous carbon spheres (N-DHMCSs) has been developed by using anionic block copolymer polystyrene-b-poly(acrylic acid) (PS-b-PAA) micelles as soft template, tetraethyl orthosilicate (TEOS) as silica source, and dopamine (DA) as carbon and nitrogen sources, respectively. After carbonization of the PDA precursors and the removal of silica, the obtained N-DHMCSs present high specific surface area (>600 m²/g), adjustable nitrogen doping content (4.02%–5.91% in weight ratios), and unique double-shell hollow structures. Especially, the sample of N-DHMCSs-800 carbonized at 800 °C exhibits a high discharge specific capacity of 920.3 mA h/g at a current density of 0.1 A/g after 100 cycles. In addition, at a relative high current density of 0.5 A/g, its discharge specific capacity is up to 614.1 mA h/g even after 300 cycles. More importantly, it demonstrates excellent rate capabilities by the fact that a high reversible capacity of 910.9 mA h/g was maintained after cycling at different current densities. Therefore, it is anticipated that such a facile “soft-template” strategy can provide us a promising platform for preparing multishelled and hollow structured nanomaterials with various components and functions.

中文翻译：

氮掺杂双壳空心中孔碳纳米球的简便合成，作为锂离子电池的高性能阳极材料

在这项工作中，通过使用阴离子嵌段共聚物聚苯乙烯-b-聚丙烯酸（PS- b），开发了一种容易的“软模板”路线来合成氮掺杂的双壳中空介孔碳球（N-DHMCSs）。-PAA）胶束作为软模板，原硅酸四乙酯（TEOS）作为二氧化硅源，多巴胺（DA）作为碳和氮源。PDA前体碳化并除去二氧化硅后，所得N-DHMCSs具有较高的比表面积（> 600 m ²/ g），可调节的氮掺杂含量（重量比为4.02％-5.91％）和独特的双壳中空结构。特别地，在100个循环后，在0.1A / g的电流密度下，在800℃下碳化的N-DHMCSs-800的样品表现出920.3mAh / g的高放电比容量。此外，在0.5 A / g的相对高电流密度下，即使经过300次循环，其放电比容量也高达614.1 mA h / g。更重要的是，它通过在不同电流密度下循环后保持910.9 mA h / g的高可逆容量这一事实，证明了其出色的倍率能力。因此，可以预见的是，这种简便的“软模板”策略可以为我们提供一个有前途的平台，用于制备具有各种组分和功能的多壳和空心结构纳米材料。

更新日期：2018-03-20

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