Li2SO4-polyacrylamide polymer electrolytes for 2.0 V solid symmetric supercapacitors |
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| Institution: | 1. Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, F-63000, Clermont–Ferrand, France;2. CNRS, CEMHTI UPR3079, Univ. Orléans, F-45071, Orléans, France;3. Réseau sur le Stockage Electrochimique de l''Energie (RS2E), FR CNRS, 3459, France;1. Thin Film Physics Laboratory, Department of Physics, Shivaji University, Kolhapur 416004, MS, India;2. Catalan Institute of Nanoscience and Nanotechnology, CIN2, ICN2 (CSIC-ICN), Campus UAB, E-08193 Bellaterra, Barcelona, Spain;3. Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-Dong, Puk-Gu, Gwangju 500-757, South Korea;1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, School of Material Science and Engineering, Department of Polymeric Materials Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, PR China;2. National Water and Energy Center, United Arab Emirates University, Al Ain, 15551, United Arab Emirates;1. Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, London, WC1E 7JE, UK;2. Christopher Ingold Laboratory, Department of Chemistry, University College London, London, WC1H 0AJ, UK;3. Materials Research Institute, School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK;4. Centre of Functional Nanomaterials, School of Engineering and Materials Science, Queen Mary University of London, Queen Mary University of London, London, E1 4NS, UK;5. Qingdao University of Science and Technology, Institute of Chemical Engineering, Qingdao, China;6. College of Biological, Chemical Sciences and Engineering, Jiaxing University, 314001, China |
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| Abstract: | A neutral polymer electrolyte comprised of lithium sulfate (Li2SO4) and polyacrylamide (PAM) was developed. The Li2SO4-PAM electrolyte film shows an ionic conductivity up to 10 mS cm? 1 in 45%RH conditions. Solid double layer capacitors were demonstrated using CNT-graphite electrodes and Li2SO4-PAM solid electrolytes. The voltage window of the solid cell was about 2.0 V, identical to that of a Li2SO4 liquid cell used as baseline. The demonstrated voltage window is significantly larger than that reported for proton- or hydroxyl-conducting electrolytes, suggesting that the Li2SO4-PAM electrolyte is a promising system for high energy density supercapacitors. The solid device also demonstrated excellent rate capability (up to 5 V s? 1) and good cycle life (beyond 10,000 charge/discharge cycles). |
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