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Robust rope supercapacitor constructed by programmed graphene composite fibers with high and stable performance
- Nie, Wenqi, Weng, Wei, Liu, Lianmei, Zhang, Shu, Yang, Xudong, Hu, Jiyong, Zhang, Yang, Li, Qiao, Ding, Xin
- Carbon 2019 v.146 pp. 329-336
- electrodes, electronics, energy, energy density, graphene
- Scaling up energy with volume is critical for fiber supercapacitors to its practical usage in flexible and wearable electronics, which remains a pressing challenge. Here thick fiber electrodes with hierarchical pores are fabricated by programming hundreds of graphene composite fibers into a rope via scalable twisting and braiding. And a volume-independent energy density is achieved from the fiber to the rope with a tremendous volume surge of 1500 magnifications. Based on this rope, a bulky fiber supercapacitor, labeled as rope supercapacitor, is manufactured with a coaxial format. Moreover, highly integrated tandem rope supercapacitors are facilely assembled by sharing electrodes, which are strong and stable in dynamic usage. Furthermore, an 8-unit rope supercapacitor possesses a record high device energy that is 5 times and 35 times higher than that of the state-of-the-art film and fiber supercapacitors, respectively. The idea here can be extended to other fiber-shaped devices to be scaled up without any performance degrading.