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Supercapacitors with lithium-ion electrolyte: an experimental study and design of the activated carbon electrodes via modelling and simulations

Markoulidis, Foivos, Bates, Josh, Lekakou, Constantina, Slade, Bob and Laudone, Guliano M. (2020) Supercapacitors with lithium-ion electrolyte: an experimental study and design of the activated carbon electrodes via modelling and simulations Carbon.

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Abstract

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 ohm for 1 cm2 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 m2 g-1.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Markoulidis, Foivosf.markoulidis@surrey.ac.uk
Bates, Josh
Lekakou, ConstantinaC.Lekakou@surrey.ac.uk
Slade, BobR.Slade@surrey.ac.uk
Laudone, Guliano M.
Date : 7 April 2020
Funders : EPSRC
Grant Title : ISCF Wave 1: High Power Material Hybridised Battery
Projects : HiPoBat Project
Depositing User : James Marshall
Date Deposited : 09 Apr 2020 13:37
Last Modified : 09 Apr 2020 13:37
URI: http://epubs.surrey.ac.uk/id/eprint/854139

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