Manganese Dioxide Purification Methods for Producing Tantalum Capacitors with Low Equivalent Series Resistance

2019 ◽  
Keyword(s):  
Manganese Dioxide ◽  
Series Resistance ◽  
Equivalent Series Resistance ◽  
Purification Methods

Impact of Cationic Molecular Length of Ionic Liquid Electrolytes on Cell Performances of 18650 Supercapacitors

2021 ◽  
Author(s):  
Phatsawit Wuamprakhon ◽  
Ruttiyakorn Donthongkwa ◽  
Kanit Hantanasirisakul ◽  
Vinich Promarak ◽  
Jumras Limtrakul ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Porous Carbon ◽  
Room Temperature ◽  
Series Resistance ◽  
Room Temperature Ionic Liquids ◽  
Specific Cell ◽  
Equivalent Series Resistance ◽  
Molecular Length ◽  
Cell Capacitance

The specific cell capacitance, equivalent series resistance (ESR) and equivalent distributed resistance (EDR) of porous carbon-based supercapacitors linearly depend on the cation molecular length (1 dimension) of room-temperature ionic liquids.

scholarly journals How to Measure and Calculate Equivalent Series Resistance of Electric Double-Layer Capacitors

Molecules ◽  
2019 ◽  
Vol 24 (8) ◽  
pp. 1452 ◽  
Author(s):  
Rafael Vicentini ◽  
Leonardo Morais Da Silva ◽  
Edson Pedro Cecilio Junior ◽  
Thayane Almeida Alves ◽  
Willian Gonçalves Nunes ◽  
...  
Keyword(s):  
Double Layer ◽  
Electric Double Layer ◽  
Series Resistance ◽  
Voltage Drop ◽  
Equivalent Series Resistance ◽  
Galvanostatic Charge ◽  
Applied Current ◽  
Double Layer Capacitors ◽  
Charge Discharge ◽  
Electric Double Layer Capacitors

Electric double-layer capacitors (EDLCs) are energy storage devices that have attracted attention from the scientific community due to their high specific power storage capabilities. The standard method for determining the maximum power (Pmax) of these devices uses the relation Pmax = U2/4RESR, where U stands for the cell voltage and RESR for the equivalent series resistance. Despite the relevance of RESR, one can observe a lack of consensus in the literature regarding the determination of this parameter from the galvanostatic charge-discharge findings. In addition, a literature survey revealed that roughly half of the scientific papers have calculated the RESR values using the electrochemical impedance spectroscopy (EIS) technique, while the other half used the galvanostatic charge discharge (GCD) method. RESR values extracted from EIS at high frequencies (>10 kHz) do not depend on the particular equivalent circuit model. However, the conventional GCD method better resembles the real situation of the device operation, and thus its use is of paramount importance for practical purposes. In the latter case, the voltage drop (ΔU) verified at the charge-discharge transition for a given applied current (I) is used in conjunction with Ohm’s law to obtain the RESR (e.g., RESR = ΔU/ΔI). However, several papers have caused a great confusion in the literature considering only applied current (I). In order to shed light on this important subject, we report in this work a rational analysis regarding the GCD method in order to prove that to obtain reliable RESR values the voltage drop must be normalized by a factor of two (e.g., RESR = ΔU/2I).

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