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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
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A comprehensive study of supercapacitor Peukert constant dependence on voltage
1Department of Electrical Engineering, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA.
Journal of Energy Storage
|February 18, 2020
Summary
The supercapacitor Peukert constant decreases with lower cutoff voltages or higher initial voltages during discharge. This finding impacts energy storage performance analysis and supercapacitor modeling.
Area of Science:
- Electrochemistry
- Energy Storage Systems
- Materials Science
Background:
- Supercapacitors exhibit behavior described by Peukert's law, where delivered charge varies with discharge current.
- Understanding the Peukert constant's dependence on operating parameters is crucial for accurate supercapacitor performance prediction.
Purpose of the Study:
- To investigate the supercapacitor Peukert constant's dependency on terminal voltage during constant current discharge.
- To analyze the influence of initial voltage, cutoff voltage, and voltage difference on the Peukert constant.
Main Methods:
- Experimental investigation of supercapacitor discharge under varying voltage conditions.
- Analysis of charge delivery and discharge time in relation to voltage parameters.
Main Results:
- The Peukert constant is observed to be lower when the cutoff voltage is reduced or the initial voltage is increased.
- Increased voltage difference leads to greater charge release and longer discharge times.
- Higher initial voltages result in more charge delivered due to voltage-dependent capacitance.
Conclusions:
- Supercapacitor Peukert constant is significantly influenced by terminal voltage parameters.
- Voltage-dependent capacitance and deeper discharge of branch capacitors contribute to a smaller Peukert constant under specific conditions.
- These findings provide insights into supercapacitor behavior and aid in optimizing their application in energy storage.
Keywords:
Constant current dischargePeukert constantPeukert’s lawSupercapacitorVoltage-dependent capacitanceMore Related Videos
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