Bottom-Up Confined Synthesis of Nanorod-in-Nanotube Structured Sb@N-C for Durable Lithium and Sodium Storage
Bottom-Up Confined Synthesis of Nanorod-in-Nanotube Structured Sb@N-C for Durable Lithium and Sodium Storage
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DOI：
10.1002/aenm.201703237
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发表时间：
2018-07-05
影响因子：
27.8
通讯作者：
Mai, Liqiang
中科院分区：
文献类型：
--
作者：
Luo, Wen;Li, Feng;Mai, Liqiang
锑（Sb）因其660 mAh g(-1)的高理论容量而成为锂离子电池和钠离子电池的有吸引力的阳极材料。在这项工作中，通过自下而上的限制方法设计和制造了一种新型的豆荚状氮掺杂碳空心纳米管封装的锑纳米棒复合材料，即所谓的纳米棒中纳米管结构的Sb@N-C。通过原位高温 X 射线衍射表征来监测 N 掺杂碳涂层和热还原过程。由于其先进的结构优点，例如充足的氮掺杂、一维导电碳涂层和大量的内部空隙空间，Sb@N-C表现出优异的锂/钠存储性能。对于锂存储，Sb@N-C表现出高可逆容量（0.2 A g(-1)下为650.8 mAh g(-1)）、优异的长期循环稳定性（2 A g(-1)下3000次循环，每次循环容量衰减仅为0.022%）和超高倍率性能（20 A g(-1)下为343.3 mAh g(-1)）。对于钠存储，Sb@N-C纳米复合材料在已报道的锑基负极材料中表现出最佳的长期循环性能（在2 A g(-1)下循环3000次后容量为345.6 mA h g(-1)），并且倍率能力高达10 A g(-1)。结果表明，Sb@N-C纳米复合材料是一种有前途的高性能锂/钠存储负极材料。
Antimony (Sb) has emerged as an attractive anode material for both lithium and sodium ion batteries due to its high theoretical capacity of 660 mA h g(-1). In this work, a novel peapod-like N-doped carbon hollow nanotube encapsulated Sb nanorod composite, the so-called nanorod-in-nanotube structured Sb@N-C, via a bottom-up confinement approach is designed and fabricated. The N-doped-carbon coating and thermal-reduction process is monitored by in situ high-temperature X-ray diffraction characterization. Due to its advanced structural merits, such as sufficient N-doping, 1D conductive carbon coating, and substantial inner void space, the Sb@N-C demonstrates superior lithium/sodium storage performance. For lithium storage, the Sb@N-C exhibits a high reversible capacity (650.8 mA h g(-1) at 0.2 A g(-1)), excellent long-term cycling stability (a capacity decay of only 0.022% per cycle for 3000 cycles at 2 A g(-1)), and ultrahigh rate capability (343.3 mA h g(-1) at 20 A g(-1)). For sodium storage, the Sb@N-C nanocomposite displays the best long-term cycle performance among the reported Sb-based anode materials (a capacity of 345.6 mA h g(-1) after 3000 cycles at 2 A g(-1)) and an impressive rate capability of up to 10 A g(-1). The results demonstrate that the Sb@N-C nanocomposite is a promising anode material for high-performance lithium/sodium storage.