Confining Sb nanoparticles in bamboo-like hierarchical porous aligned carbon nanotubes for use as an anode for sodium ion batteries with ultralong cycling performance
Confining Sb nanoparticles in bamboo-like hierarchical porous aligned carbon nanotubes for use as an anode for sodium ion batteries with ultralong cycling performance
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将锑纳米粒子限制在竹状分层多孔排列碳纳米管中，用作具有超长循环性能的钠离子电池的阳极
DOI：
10.1039/d0ta10556b
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发表时间：
2021
影响因子：
11.9
通讯作者：
Tao Tao
中科院分区：
文献类型：
--
作者：
Kang Chao;Zhou Shengping;Liu Jilei;Zhu YanFei;Hu Aiping;Tang Qunli;Zhang Yan;Chen Xiaohua;Tao Tao
合金基负极材料由于其高比容量而被广泛研究用于钠离子电池。然而，它们在循环期间遭受巨大的体积变化，并且如何提高阳极的结构耐久性仍然具有挑战性。本文采用溶液浸渍、熔融扩散和还原相结合的方法，制备了Sb纳米颗粒与竹节状多孔氮掺杂定向碳纳米管（HPACNTs）阵列的复合材料。竹状HPACNT作为Sb储层，具有良好的物理限制，可以确保Sb/HPACNT复合阳极的整体结构稳定性。此外，HPACNTs内腔中的光滑通道、分级孔和竹节状石墨烯层有效地调节了Sb的体积效应，并在循环过程中导致平滑的电子和离子传输。由于这些结构优势，所开发的Sb/HPACNTs复合材料显示出超长的循环稳定性，在1 A g-1的电流密度下经过4500次循环后，可逆容量为318 mA h g-1。这项工作为Sb/HPACNTs结构提供了一个重要的策略，可以扩展到其他合金基阳极的高性能钠存储。
Alloy-based anode materials have been widely studied for sodium-ion batteries due to their high specific capacities. However, they suffer from huge volume changes during cycling, and how to improve the structural durability of the anodes is still challenging. Herein, the composite of Sb nanoparticles being confined in bamboo-like hierarchical porous N-doped aligned carbon nanotubes (HPACNTs) arrays has been constructed through a combination of solution impregnation, melting diffusion and reduction. Bamboo-like HPACNTs, acting as Sb reservoirs with excellent physical confinement, can ensure the integral structural stability of the Sb/HPACNTs composite anode. Furthermore, smooth channels, hierarchical pores and bamboo knot-like graphene layers in the inner cavities of HPACNTs effectively modulate the volume effect of Sb, as well as result in smooth electron and ion transport during cycling. Attributed to these structural advantages, the as-developed Sb/HPACNTs composite shows an ultralong cycling stability with a reversible capacity of 318 mA h g−1 after 4500 cycles at a current density of 1 A g−1. This work provides a significant strategy for Sb/HPACNTs architectures, which could be extended to other alloy-based anodes for high performance sodium storage.