Supercapacitor leakage in energy-harvesting sensor nodes: fact or fiction?


Merrett, Geoff V. and Weddell, Alex S. (2012) Supercapacitor leakage in energy-harvesting sensor nodes: fact or fiction? At International Workshop Algorithms and Concepts for Networked Sensing Systems Powered by Energy Harvesters 2012 (EnHaNSS'12), Belgium. 11 Jun 2012. 5 pp.

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Description/Abstract

As interest in energy-harvesting sensor nodes continues to grow, the use of supercapacitors as energy stores or buffers is gaining popularity. The reasons for their use are numerous, and include their high power density, simple interfacing requirements, simpler measurement of state-of-charge, and a greater number of charging cycles than secondary batteries. However, supercapacitor energy densities are orders of magnitude lower. Furthermore, they have been reported to exhibit significant leakage, and this has been shown to increase exponentially with terminal voltage (and hence stored energy). This observation has resulted in a number of algorithms, designs and methods being proposed for effective operation of supercapacitor-based energy-harvesting sensor nodes. In this paper, it is argued that traditional ‘leakage’ is not as significant as has commonly been suggested. Instead, what is observed as leakage is in fact predominantly due to internal charge redistribution. As a result, it is suggested that different approaches are required in order to effectively utilize supercapacitors in energy-harvesting sensor nodes.

Item Type: Conference or Workshop Item (Paper)
Venue - Dates: International Workshop Algorithms and Concepts for Networked Sensing Systems Powered by Energy Harvesters 2012 (EnHaNSS'12), Belgium, 2012-06-11 - 2012-06-11
Related URLs:
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Organisations: Electronic & Software Systems
ePrint ID: 337641
Date :
Date Event
30 April 2012Submitted
June 2012Published
Date Deposited: 30 Apr 2012 16:41
Last Modified: 17 Apr 2017 17:14
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/337641

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