Button cell supercapacitors with monolithic carbon aerogels |
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| Affiliation: | 1. School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong, China;2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;2. State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, PR China;3. Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, PR China;4. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, PR China;5. School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen 518055, PR China;6. School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, PR China;7. Beijing HCC Energy Technology Co., Ltd, Beijing 100085, PR China;1. Univ. Grenoble Alpes, CEA, CNRS, INAC-SyMMES, 17 rue des Martyrs, F-38000, Grenoble, France;2. IOLITEC Ionic Liquids Technologies GmbH, Salzstrasse 184, 74076, Heilbronn, Germany;1. Computational Optics Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;2. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;3. School of Engineering, Al-Balqa Applied University, Salt, 19117, Jordan;4. Department of Electronics and Communication Engineering, National Institute of Technology, Silchar, India;5. Department of Electronics and Communication Engineering, Gandhi Institute for Technological Advancement(GITA), Bhubaneswar, India |
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| Abstract: | Carbon aerogels are highly porous materials prepared via pyrolysis of resorcinol–formaldehyde aerogels. The density of the aerogels can be varied in a wide range, whereby the major part of the pores is accessible to ionic conductors. Therefore, the application of high surface area aerogels as electrodes in supercapacitor devices is promising. In the present publication, the integration of thin monolithic aerogel composites in button cell casings is presented. The preparation of thin and mechanically stable aerogel electrodes was performed via integration of carbon fibers into the aerogel skeleton. In order to increase the external electrode area in the button cells (volume: 2.1 cm3) a special folding technique for the electrodes (thickness: 180 μm) was employed. The aerogel capacitors exhibit an excellent long term stability with no significant degradation after 80,000 charging and discharging cycles. According to a ragone-evaluation of the impedance data, the maximum power output and energy content for the aerogel button cells are 4.6 W and 4.9 mWh, respectively. The influence of CO2-activation on the capacitive and resistive behavior of the electrodes in different aqueous electrolytes is analyzed using innovative analytical methods for cyclic voltammetry and impedance spectroscopy. |
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