Journal
CARBON
Volume 164, Issue -, Pages 422-434Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.04.017
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Funding
- EPSRC under the HiPoBat project: ISCFWave 1: High Power Material Hybridised Battery [EP/R022852/1]
- EPSRC [EP/R022852/1] Funding Source: UKRI
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Electrochemical double layer capacitors (EDLCs) are investigated with activated carbon electrodes and a lithium-ion electrolyte, in anticipation of potential future applications in hybridised battery-supercapacitor devices and lithium ion capacitors. An experimental study of a symmetric electrochemical double layer capacitor (EDLC) with activated carbon (AC) electrodes on aluminium foil current collectors and electrolyte 1 M LiPF6 in EC:EMC 50:50 v/v concludes a stability window to a maximum potential of 3 V, an equivalent in series resistance of 48 Omega for 1 cm(2) cell area (including the contact resistance between electrode and current collector) and an average specific electrode capacitance of 50.5 F g(-1). Three AC electrode materials are assessed via computer simulations based on a continuum ion and charge transport model with volume-averaged equations, considering the pore size distribution for each electrode material and, depending on pore size, transport of tetrahedral solvated or flat solvated Li+ ions and solvated or desolvated PF6- ions. The computer simulations demonstrate that the best electrode material is an AC coating electrode with a hierarchical pore size distribution measured in the range of 0.5-180 nm and bimodal shape, and specific surface area BET = 808 m(2) g(-1). (C) 2020 Published by Elsevier Ltd.
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