Tin quantum dots embedded in nitrogen-doped carbon nanofibers as excellent anode for lithium-ion batteries
Tin quantum dots embedded in nitrogen-doped carbon nanofibers as excellent anode for lithium-ion batteries
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嵌入氮掺杂碳纳米纤维中的锡量子点作为锂离子电池的优异阳极
DOI：
10.1016/j.nanoen.2014.06.030
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发表时间：
2014-10
期刊：
影响因子：
17.6
通讯作者：
Duan, Huigao
中科院分区：
文献类型：
--
作者：
Gong, Feilong;Li, Feng;Li, Cheng Chao;Duan, Huigao
亚10纳米级锡纳米粒子均匀分散在碳基体中的Sn/C复合材料被认为是高能量和功率密度锂离子电池的优异负极材料。然而，由于碳表面的疏水性，很难将高容量、活性的锡结合到碳结构中。为了使活性锡均匀分散，总是需要表面活性剂和/或模板剂，这不可避免地增加了生产成本并降低了电子电导率。在这项工作中，我们报道了一种简便且可扩展的静电纺丝技术，用于合成精细嵌入氮掺杂碳纳米纤维中的锡量子点。该复合电极在0.1 A g−1电流密度下循环200次后表现出887 mAh g−1的高可逆容量，初始容量保留率约为75%。此外，即使在 0.2 A g−1 下循环，500 次循环后约 685 mAh g−1 循环，在 0.4 A g−1 循环 200 次循环后约 508 mAh g−1 也表现出良好的倍率性能。这种优异的性能应该得益于氮掺杂多孔碳纳米纤维结构的高电导率，它不仅为电解质离子和电子提供了快速且通用的传输途径，而且同时解决了Sn阳极粉化、电接触损失和颗粒聚集的主要问题。此外，超小Sn颗粒为电子和离子提供的短扩散路径进一步提高了倍率性能。
Sn/C composites with sub-10-nm-scale tin nanoparticles uniformly dispersed in a carbon matrices are believed to be excellent anode materials for high energy and power density lithium-ion batteries. However, it is difficult to incorporate high-capacity, active Sn into the carbon structures due to the hydrophobic nature of the carbon surface. Surfactants and/or templates are always required for uniform dispersion of active Sn, inevitably increasing the production cost and degrading the electronic conductivity. In this work, we reported a facile and scalable electrospinning technology to synthesize Sn quantum dots finely embedded in N-doped carbon nanofibers. The composite electrode exhibited a high reversible capacity of 887 mAh g−1at a current density of 0.1 A g−1after 200 cycles, about 75% retention of the initial capacity. Moreover, it showed good rate capability even when cycled at 0.2 A g−1about 685 mAh g−1after 500 cycles and 508 mAh g−1at 0.4 A g−1after 200 cycles. The exceptional performance is supposed to benefit from the high electric conductivity of N-doped porous carbon nanofiber structures, which not only provides fast and versatile transport pathways for the electrolyte ions and electrons, but also simultaneously solves the major problems of pulverization, loss of electrical contact, and particle aggregation of Sn anode. Moreover, the short diffusion path for both electrons and ions provided by the ultrasmall Sn particles further improved the rate performance.
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影响因子：
56.9
作者：
Idota, Y;Kubota, T;Miyasaka, T
通讯作者：
Miyasaka, T
锚定Co3O4纳米粒子的石墨烯作为锂离子电池负极增强可逆容量和循环性能
影响因子：
17.1
作者：
Wu, Zhong-Shuai;Ren, Wencai;Cheng, Hui-Ming
通讯作者：
Cheng, Hui-Ming
影响因子：
32.5
作者：
Wang, Dongniu;Yang, Jinli;Sun, Xueliang
通讯作者：
Sun, Xueliang
影响因子：
10.8
作者：
Shin, Weon Ho;Jeong, Hyung Mo;Choi, Jang Wook
通讯作者：
Choi, Jang Wook
影响因子：
41.2
作者：
Magasinski, A.;Dixon, P.;Yushin, G.
通讯作者：
Yushin, G.