基于激光离焦直写炭布原位负载二氧化锰高频柔性超级电容器

A high-frequency flexible symmetric supercapacitor prepared by the laser-defocused ablation of MnO2 on a carbon cloth

  • 摘要: 柔性电子领域的快速发展,促进了人们对于储能器件的需求。超级电容器与电池相比,在充放电速率、功率密度和循环寿命等方面都具有显著优势,但当应用于高频(100 Hz以上)时,大多数超级电容器的频率响应较差,因而,开发一种能够在100 Hz以上工作的超级电容器仍然具有挑战性。本文报道了用离焦激光烧蚀法合成的MnO2/炭布复合电极(LCC@MnO2)组成的高频柔性对称超级电容器。这种基于LCC@MnO2的对称超级电容器在120 Hz下面积比电容达到1.53 mF cm−2,并且在100 V s-1的扫速下,循环100000次仍然具有92.10%的容量保持率。其优异的电化学性能是由于三维结构炭布的高电导率和激光诱导形成的MnO2纳米片优异的赝电容性能的协同作用。同时,激光烧蚀法有利于实现大规模生产,在高频电子器件产业应用中有广阔前景。

     

    Abstract: The rapid development of flexible electronics has produced an enormous demand for supercapacitors. Compared to batteries, supercapacitors have great advantages in terms of power density and cycling stability. They can also respond well on a time scale of seconds, but most have a poor frequency response, and behave more like pure resistors when used at high frequencies (e.g., above 100 Hz). It is therefore challenging to develop supercapacitors that work at a frequency of over 100 Hz. We report a high-frequency flexible symmetrical supercapacitor composed of a MnO2@carbon cloth hybrid electrode (CC@MnO2), which is synthesized by the defocused-laser ablation method. This CC@MnO2-based symmetric supercapacitor has an excellent specific areal capacitance of 1.53 mF cm−2 at a frequency of 120 Hz and has good cycling stability with over 92.10% capacitance retention after 100000 cycles at 100 V s−1. This remarkable electrochemical performance is attributed to the combined effect of the high conductivity of the 3D structure of the carbon cloth and the exceptional pseudo-capacitance of the laser-produced MnO2 nanosheets. The defocused laser ablation method can be used for large-scale production using roll-to-roll technology, which is promising for the wide use of the supercapacitor in high-frequency electronic devices.

     

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