SiC-Sb-C nanocomposites as high-capacity and cycling-stable anode for sodium-ion batteries

SiC-Sb-C nanocomposites as high-capacity and cycling-stable anode for sodium-ion batteries
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SiC-Sb-C纳米复合材料作为钠离子电池高容量且循环稳定的阳极

DOI:
10.1016/j.electacta.2012.08.103
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发表时间:
2013
影响因子:
6.6
通讯作者:
Yang, Hanxi
Yang, Hanxi
中科院分区:
材料科学2区
文献类型:
--
作者:
Qian, Jiangfeng;Cao, Yuliang;Ai, Xinping;Yang, Hanxi

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采用简单的机械球磨法制备了具有核壳结构的SiC-Sb-C纳米复合材料。这种核壳结构是由刚性的SiC纳米颗粒作为内核,Sb纳米颗粒作为锚定在SiC表面的电化学活性层,碳外层组成的。电化学实验表明,与Sb - c复合材料相比,SiC-Sb-C电极在na存储反应中提高了Sb的电化学利用率和循环稳定性,表明这种核壳结构可以有效缓冲体积变化并保持结构稳定性。特别是在Sb层中加入Cu后,SiC-Sb-Cu-C电极比SiC-Sb-C电极具有更高的容量和循环稳定性(循环100次后为595mAhg−1)。因此,核壳结构为开发高容量、稳定循环的钠离子电池合金阳极提供了可行的策略。
SiC–Sb–C nanocomposites with core–shell structure were prepared by simple mechanical ball-milling method. This core–shell structure is composed of rigid SiC nanoparticles as inner core, Sb nanoparticles as an electrochemical active layer anchored on the surface of SiC, and carbon outlayer. The electrochemical experiments show that the SiC–Sb–C electrode improve electrochemical utilization and cycling stability of Sb during Na-storage reaction in comparison with Sb–C composites, indicating that such core–shell structure can effectively buffer the volume change and remain structural stability. Particularly, after incorporating Cu into Sb layer, the SiC–Sb–Cu–C electrode exhibits higher capacity and cycling stability (595mAhg−1after 100 cycles) than the SiC–Sb–C electrode. Therefore, the core–shell structure can provide a viable strategy to develop high capacity and stable cycling alloy anode for sodium ion batteries.
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