Graphene/activated carbon supercapacitors with sulfonated-polyetheretherketone as solid-state electrolyte and multifunctional binder |
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| Affiliation: | 1. Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan;2. Department of Materials Science and Engineering, Feng Chia University, 100 Wen Hwa Rd., 407 Taichung, Taiwan;3. Enerage Inc., No. 5, Ligong 3rd Rd, Wujie Township, Yilan County 26841, Taiwan;4. Taiwan Textile Research Institute, No. 6, Chengtian Rd, Tucheng City, Taipei 23674, Taiwan;5. Laboratory for Functional Polymers, Swiss Federal Laboratories for Materials Science and Technology (Empa), Überlandstrasse 129, 8600 Dübendorf, Switzerland;1. Laboratory for Quantum Engineering and Micro–Nano Energy Technology, Department of Physics, Xiangtan University, Xiangtan, Hunan 411105, China;2. Beijing Computational Science Research Centre, Beijing 100084, China;3. Laboratory of Thin Film Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;1. Computational Chemistry Center for Nanotechnology and Department of Chemistry, Faculty of Science and Technology, Rajabhat Maha Sarakham University, Maha Sarakham 44000, Thailand;2. Center of Excellence for Innovation in Chemistry and Supramolecular Chemistry Research Unit, Department of Chemistry, Faculty of Science, Mahasarakham University, Maha Sarakham 44150, Thailand;1. College of Chemistry and Chemical Engineering, Chongqing University of Technology, 69 Hongguang Road, Lijiatuo, Banan District, Chongqing 400054, PR China;2. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, PR China;3. Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, PR China;4. School of Energy Research, Xiamen University, Xiamen 361005, PR China |
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| Abstract: | Sulfonated polyetheretherketone (SPEEK) has been synthesised by sulphonation process and used as the solid-state electrolyte, binder and surfactant for supercapacitors. Reduced graphene dispersed by SPEEK is used as a high-efficiency conducting additive in solid-state supercapacitors. It is found that SPEEK can improve the stability of the reduced graphene dispersion significantly, and therefore, the solid-state supercapacitors show a large decrease in IR drop and charge-transfer resistance (Rct), resulting in a higher rate capability. The solid-state supercapacitors with the activated carbon/reduced graphene/SPEEK/electrode can be operated from 1 to 8 A/g and exhibit capacity retention of 93%. The noteworthy is more than twice higher value for capacity retention by comparison with the solid-state supercapacitors using activated carbon/reduced graphene/PVDF electrode (capacity retention is 36%). The cell of reduced graphene with SPEEK can be cycled over 5000 times at 5 A/g with no capacitance fading. |
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| Keywords: | Sulfonated polyetheretherketone Reduced graphene Capacity retention Supercapacitor |
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