Facile fabrication of low-cost and scalable graphite tape as novel current collectors for flexible supercapacitors
Facile fabrication of low-cost and scalable graphite tape as novel current collectors for flexible supercapacitors
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DOI：
10.1016/j.jallcom.2020.158476
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发表时间：
2021-04
影响因子：
6.2
通讯作者：
N. Yu;Rundi Xiong;Yuying Wang;Chen Zhou;Yanpeng Li;C. Pang;Zhuyao Li;Lixia Zou;Kai-min Guo-Kai-m
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文献类型：
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作者：
N. Yu;Rundi Xiong;Yuying Wang;Chen Zhou;Yanpeng Li;C. Pang;Zhuyao Li;Lixia Zou;Kai-min Guo-Kai-m
柔性超级电容器被认为是为柔性和可穿戴电子产品供电的良好候选者。目前，用于超级电容器的柔性集流器仍然有限。具有高导电性和良好柔韧性的碳基材料是超级电容器优良的集流材料。然而，碳基集流器的合成过程繁琐且耗时，导致其合成成本较高。在这里，通过简单地用胶带从低成本石墨片上剥离薄石墨层，开发出具有高导电性和柔韧性的石墨带复合材料集流器。石墨带易于放大，电导率为1395 S/m，在不同弯曲状态下均能保持稳定的电导率。优化后的MnO2@graphite带电极在0.5 mA/cm2下的最大比电容为577.5 mF/cm2。基于优化电极的超级电容器在不同弯曲状态和2000次弯曲循环下具有189.3 mF/cm2的高比电容和优异的柔韧性。电极和超级电容器的高性能与石墨带优异的导电性和良好的机械柔韧性有关。这项工作为柔性超级电容器的低成本、可扩展和高性能碳基集流器开辟了一种简便的制造方法。
Flexible supercapacitors are regarded as a good candidate for powering flexible and wearable electronics. Currently, flexible current collectors for supercapacitors are still limited. Carbon-based materials with high conductivity and good flexibility are excellent current collectors for supercapacitors. However, the synthesis process for carbon-based current collectors is very tedious and time-consuming, leading to high synthesis cost. Here, graphite tape composite based current collectors with high electric conductivity and flexibility have been developed by simply peeling off a thin graphite layer with a tape from a low-cost graphite sheet. The graphite tape can be easily scaled up, has an electric conductivity of 1395 S/m, and maintains stable conductivity during different bending states. The optimized MnO2@graphite tape electrode shows a maximum specific capacitance of 577.5 mF/cm2at 0.5 mA/cm2. The supercapacitor based on the optimized electrode delivers a high specific capacitance of 189.3 mF/cm2and excellent flexibility during different bending states and 2000 bending cycles. The high performance of electrodes and supercapacitors is related to the excellent conductivity and good mechanical flexibility of the graphite tape. This work opens up a facile fabrication method for low-cost, scalable, and high-performance carbon-based current collectors for flexible supercapacitors.