High-capacity antimony sulphide nanoparticle-decorated graphene composite as anode for sodium-ion batteries
High-capacity antimony sulphide nanoparticle-decorated graphene composite as anode for sodium-ion batteries
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DOI：
10.1038/ncomms3922
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发表时间：
2013-12
影响因子：
16.6
通讯作者：
D. Yu;P. Prikhodchenko;C. Mason;Sudip Kumar Batabyal;J. Gun;S. Sladkevich;A. Medvedev;O. Lev
中科院分区：
文献类型：
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作者：
D. Yu;P. Prikhodchenko;C. Mason;Sudip Kumar Batabyal;J. Gun;S. Sladkevich;A. Medvedev;O. Lev
在大规模应用中，钠离子电池是锂离子电池的替代品。然而，现有阳极的产能低、倍率能力差是制约未来发展的主要瓶颈。本文报道了用溶液合成法在石墨烯表面均匀涂覆一层硫化锑(辉锑矿)作为钠离子电池负极材料。在50 mA g−1下，其容量高达730 mAhg 1，高达6C的优异倍率能力和良好的循环性能。这种良好的性能归功于小颗粒中钠离子的快速扩散，以及活性物质与石墨烯之间的紧密接触带来的良好的电子传输，这也为锚定纳米颗粒提供了模板。我们还展示了一种不含钠金属的SbNite-石墨烯复合材料电池，其能量密度可达80 WH kg−1。如果进一步优化，其能量密度可以超过一些锂离子电池。
Sodium-ion batteries are an alternative to lithium-ion batteries for large-scale applications. However, low capacity and poor rate capability of existing anodes are the main bottlenecks to future developments. Here we report a uniform coating of antimony sulphide (stibnite) on graphene, fabricated by a solution-based synthesis technique, as the anode material for sodium-ion batteries. It gives a high capacity of 730 mAh g−1at 50 mA g−1, an excellent rate capability up to 6C and a good cycle performance. The promising performance is attributed to fast sodium ion diffusion from the small nanoparticles, and good electrical transport from the intimate contact between the active material and graphene, which also provides a template for anchoring the nanoparticles. We also demonstrate a battery with the stibnite–graphene composite that is free from sodium metal, having energy density up to 80 Wh kg−1. The energy density could exceed that of some lithium-ion batteries with further optimization.