Thermal conductivity and temperature profiles in carbon electrodes for supercapacitors
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Publication Details
Output type: Journal article
Author list: Burheim OS, Aslan M, Atchison JS, Presser V
Publisher: Elsevier
Publication year: 2014
Journal: Journal of Power Sources (0378-7753)
Volume number: 246
Start page: 160
End page: 166
Number of pages: 7
ISSN: 0378-7753
eISSN: 1873-2755
Languages: English-Great Britain (EN-GB)
Unpaywall Data
Open access status: green
Full text URL: https://ntnuopen.ntnu.no/ntnu-xmlui/bitstream/11250/2466084/1/StydyingCLnHeat.pdf
Abstract
The thermal conductivity of supercapacitor film electrodes composed of activated carbon (AC), AC with 15 mass% multi-walled carbon nanotubes (MWCNTs), AC with 15 mass% onion-like carbon (OLC), and only OLC, all mixed with polymer binder (polytetrafluoroethylene), has been measured. This was done for dry electrodes and after the electrodes have been saturated with an organic electrolyte (1 M tetraethylammonium-tetrafluoroborate in acetonitrile, TEA-BF4). The thermal conductivity data was implemented in a simple model of generation and transport of heat in a cylindrical cell supercapacitor systems. Dry electrodes showed a thermal conductivity in the range of 0.09-0.19 W K-1 m(-1) and the electrodes soaked with an organic electrolyte yielded values for the thermal conductivity between 0.42 and 0.47 W K-1 m(-1). It was seen that the values related strongly to the porosity of the carbon electrode materials. Modeling of the internal temperature profiles of a supercapacitor under conditions corresponding to extreme cycling demonstrated that only a moderate temperature gradient of several degrees Celsius can be expected and which depends on the ohmic resistance of the cell as well as the wetting of the electrode materials. (C) 2013 Elsevier B.V. All rights reserved.
Keywords
Electrochemical energy storage, Supercapacitor, Temperature profiles, Thermal conductivity
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