A three-dimensional reticulate CNT-aerogel for a high mechanical flexibility fiber supercapacitor,Nanoscale

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A three-dimensional reticulate CNT-aerogel for a high mechanical flexibility fiber supercapacitor
Nanoscale ( IF 5.8 ) Pub Date : 2018-04-17 00:00:00 , DOI: 10.1039/c8nr01991f
Yong Li _{1,

2,

3,

4,

5} , Zhuo Kang _{1,

2,

3,

4,

5} , Xiaoqin Yan _{1,

2,

3,

4,

5} , Shiyao Cao _{1,

2,

3,

4,

5} , Minghua Li _{1,

2,

3,

4,

5} , Yan Guo _{1,

2,

3,

4,

5} , Yahuan Huan _{1,

2,

3,

4,

5} , Xiaosong Wen _{1,

2,

3,

4,

5} , Yue Zhang _{1,

2,

3,

4,

5}

Affiliation

In recent years, the rapid development of portable and wearable electronic products has promoted the prosperity of fiber supercapacitors (FSCs), which serve as flexible and lightweight energy supply devices. However, research on FSCs is still in its infancy and the energy density of FSCs is far below the level of lithium-ion batteries. Here, we report a facile method to prepare a novel fibrous CNT-aerogel by electrochemical activation and freeze-drying. The fibrous CNT-aerogel electrode possesses a large specific surface area, high mechanical strength, excellent electrical conductivity, as well as a high specific capacitance of 160.8 F g⁻¹ at 0.5 mA and long cycling stability. Then we assembled a non-faradaic FSC based on a fibrous CNT-aerogel as the electrode and a P(VDF-HFP)/EMIMBF₄ ionogel as the electrolyte. The introduction of the ionogel electrolyte increases the operating voltage of the FSC to 3 V, and makes the device combine the intrinsic high power density (27.3 kW kg⁻¹) of non-faradaic SCs with an ultrahigh energy density of 29.6 W h kg⁻¹. More importantly, the assembled FSCs show excellent flexibility and bending-stability, and can still operate normally within a wide working temperature window (0–80 °C). The outstanding electrochemical performance and the mechanical/thermal stability indicate that the assembled FSC device is a promising power source for flexible electronics.

中文翻译：

用于高机械柔韧性纤维超级电容器的三维网状CNT气凝胶

近年来，便携式和可穿戴电子产品的飞速发展促进了光纤超级电容器（FSC）的繁荣，这种超级电容器可作为灵活轻便的能源供应设备。但是，对FSC的研究仍处于起步阶段，FSC的能量密度远低于锂离子电池的水平。在这里，我们报告了一种通过电化学活化和冷冻干燥制备新型纤维状CNT-气凝胶的简便方法。纤维状CNT-气凝胶电极具有大的比表面积，高的机械强度，优异的电导率以及在0.5mA下的160.8F g ^-1的高比电容和长的循环稳定性。然后，我们以纤维状CNT-气凝胶为电极和P（VDF-HFP）/ EMIMBF ₄组装了非法拉第FSC。离子凝胶作为电解质。引入离子凝胶电解质的增加FSC的工作电压到3V，并且使得该设备相结合的固有的高功率密度（27.3千瓦千克^-1非法拉第的SC），用29.6 W时公斤的超高能量密度^{- 1}。更重要的是，组装好的FSC具有出色的柔韧性和弯曲稳定性，并且仍可以在较宽的工作温度范围（0–80°C）内正常运行。出色的电化学性能和机械/热稳定性表明，组装的FSC装置是柔性电子产品的有希望的电源。

更新日期：2018-04-17

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