Rapid Pseudocapacitive Sodium-Ion Response Induced by 2D Ultrathin Tin Monoxide Nanoarrays
Rapid Pseudocapacitive Sodium-Ion Response Induced by 2D Ultrathin Tin Monoxide Nanoarrays
复制标题
二维超薄一氧化锡纳米阵列诱导的快速赝电容钠离子响应
DOI：
10.1002/adfm.201606232
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发表时间：
2017-03-24
影响因子：
19
通讯作者：
Shen, Ze Xiang
中科院分区：
文献类型：
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作者：
Chen, Minghua;Chao, Dongliang;Shen, Ze Xiang
纳米锡基负极在锂离子电池和钠离子电池(LiBS和SIB)中都具有很好的应用前景，但其性能受到倍率能力和长期循环稳定性的限制。在高导电性的石墨烯泡沫/碳纳米管衬底上原位生长了超薄SnO纳米片阵列，形成了一种独特的、柔性的、无粘结剂的3D杂化结构电极。该电极在0.1Ag(-1)下表现出580mAhg(-1)的优异的Na+存储容量，据我们所知，它是锡基SiB阳极中最长的高速循环(1Ag(-1)下的1000次循环)。通过与LiB电极性能的比较，证明了SiB电极的准电容贡献增强是电极快速动力学和长寿命的原因。此外，在75 cm和105 cm(-1)处成功地探测到了全碱化产物Na15Sn4的拉曼峰，并用密度泛函理论计算进行了验证，这可能为其他锡基电极的结构演化分析提供一条有希望的线索。
Nanostructured tin-based anodes are promising for both lithium and sodium ion batteries (LIBs and SIBs), but their performances are limited by the rate capability and long-term cycling stability. Here, ultrathin SnO nanoflakes arrays are in situ grown on highly conductive graphene foam/carbon nanotubes substrate, forming a unique, flexible, and binder-free 3D hybrid structure electrode. This electrode exhibits an excellent Na+ storage capacity of 580 mAh g(-1) at 0.1 A g(-1), and to the best of our knowledge, has the longest-reported high-rate cycling (1000 cycles at 1 A g(-1)) among tin-based SIB anodes. Compared with its LIB performance, the enhanced pseudocapacitive contribution in SIB is proved to be the origin of fast kinetics and long durability of the electrode. Moreover, Raman peaks from the full sodiation product Na15Sn4 at 75 and 105 cm(-1) are successfully detected and also proved by density functional theory calculations, which could be a promising clue for structure evolution analysis of other tin-based electrodes.