A two-dimensional hybrid of SbOx nanoplates encapsulated by carbon flakes as a high performance sodium storage anode
A two-dimensional hybrid of SbOx nanoplates encapsulated by carbon flakes as a high performance sodium storage anode
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DOI：
10.1039/c6ta09265a
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发表时间：
2017-01
影响因子：
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通讯作者：
Wei Li-;Kangli Wang;Shijie Cheng;Kai Jiang
中科院分区：
文献类型：
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作者：
Wei Li-;Kangli Wang;Shijie Cheng;Kai Jiang
金属Sb因其容量大、成本低而被广泛研究，但由于其在循环过程中体积变化大(∼为390%)，其循环稳定性较差。本文以可溶性氯化钠为模板，制备了一种独特的碳片包裹的SbOx纳米板(SbOx@Cf)的二维杂化结构。由于它的二维结构提供了快速的Na+离子吸收和去除，以及均匀的涂层赋予了稳定的缓冲层，因此具有高的可逆容量(451mA h g−1)和优异的倍率性能(114 mA h g−1在4 A g−1下)，以及稳定的循环(100次循环后442mA h g−1，容量保持率为98%)。这项工作为制备用于电池和超级电容器的先进的二维金属氧化物开辟了一条简便、可控、经济和可扩展的途径。
Metallic Sb has been extensively researched as a Na storage anode due to its high capacity and low cost, but it suffers from poor cycling stability stemming from its huge volume change (∼390%) during cycling. Herein, a unique two-dimensional hybrid structure of SbOx nanoplates encapsulated by carbon flakes (SbOx@CF) was fabricated by templating with soluble NaCl. Benefiting from its two-dimensional structure providing rapid Na+ ion uptake and removal and uniform coating endowing a stable buffer layer, the hybrid presents a high reversible capacity (451 mA h g−1) and excellent rate capability (114 mA h g−1 at 4 A g−1), as well as stable cycling (442 mA h g−1 after 100 cycles with 98% capacity retention). This work opens up a facile, controllable, economical and extendable approach to prepare advanced two-dimensional metal oxides for batteries and supercapacitors.