The effects of cell assembly compression on the performance of carbon electrochemical double-layer capacitor electrodes

Gourdin, Gerald; Jiang, Thomas; Smith, Patricia H.; Qu, Deyang

doi:10.1016/j.jpowsour.2012.04.046

Cited by 10 publications

(6 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hu et al 12 developed a flexible EDLC and found that compressing the cell by 60%, the electrochemical performance remain unaffected. Gourdin et al 13,14 reported that compressing EDLCs with porous activated carbon electrodes would slightly increase capacitance during the initial loading, but have substantial impact on the porous structure of electrodes during the subsequent loading and possibly decrease the capacitance at higher compressive loads. A comparative analysis of compressive composite electrodes by Lv et al 15 showed that compression of EDLCs using superelastic graphene aerogel can decrease the gravimetric capacitance of a cell.…”

Section: Introductionmentioning

confidence: 99%

Strain induced electrochemical behaviors of ionic liquid electrolytes in an electrochemical double layer capacitor: Insights from molecular dynamics simulations

Roy,

Goel,

Costa

et al. 2023

The Journal of Chemical Physics

View full text Add to dashboard Cite

Electrochemical Double Layer Capacitors (EDLCs) with ionic liquid electrolytes outperform conventional ones using aqueous and organic electrolytes in energy density and safety. However, understanding the electrochemical behaviors of ionic liquid electrolytes under compressive/tensile strain is essential for the design of flexible EDLCs as well as normal EDLCs, which are subject to external forces during assembly. Despite many experimental studies, the compression/stretching effects on the performance of ionic liquid EDLCs remain inconclusive and controversial. In addition, there is hardly any evidence of prior theoretical work done in this area, which makes the literature on this topic scarce. Herein, for the first time, we developed an atomistic model to study the processes underlying the electrochemical behaviors of ionic liquids in an EDLC under strain. Constant potential non-equilibrium molecular dynamics simulations are conducted for EMIM BF4 placed between two graphene walls as electrodes. Compared to zero strain, low compression of the EDLC resulted in compromised performance as the electrode charge density dropped by 29%, and the performance reduction deteriorated significantly with a further increase in compression. In contrast, stretching is found to enhance the performance by increasing the charge storage in the electrodes by 7%. The performance changes with compression and stretching are due to changes in the double-layer structure. In addition, an increase in the value of the applied potential during the application of strain leads to capacity retention with compression revealed by the newly performed simulations.

show abstract

Section: Introductionmentioning

confidence: 99%

Strain induced electrochemical behaviors of ionic liquid electrolytes in an electrochemical double layer capacitor: Insights from molecular dynamics simulations

Roy,

Goel,

Costa

et al. 2023

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…ECs' main advantages are that they can provide high power density, high energy density, long life cycle and fast charge-discharge rate [4, 5, 6 and 7]. EDLC's energy storage mechanism arises from electrostatic charge or physical separation at the electrode-electrolyte interface [8]. Pseudocapacitor charge storage ability depends on the fast redox reactions [9].…”

Section: Introductionmentioning

confidence: 99%

Lithium-Ion Supercapacitor Using Vertically-aligned Carbon Nanotubes from Direct Growth Technique, and its Electrochemical Characteristics

Azam¹,

Manaf²,

Ahsan³

et al. 2019

Port. Electrochim. Acta

View full text Add to dashboard Cite

This paper reports the fabrication of a lithium ion supercapacitor from vertically-aligned carbon nanotubes (VACNTs) directly grown on a conductive substrate (SUS 310S alloy), using alcohol catalytic chemical vapour deposition technique. CNTs direct growth technique on an electrically conducting foil simplifies the electrode assembly, thus reducing the fabrication process, because the foil can directly act as a current collector. With the VACNT direct growth technique, the supercapacitor electrode was easily prepared and assembled with a non-aqueous 1 M LiPF6 electrolyte. Experimental results show that CNTs (multi-walled type structures of good quality) were perpendicularly grown to the substrate. This device demonstrates a specific capacitance of up to 101 F g-1 (at a scan rate of 1 mVs-1), and a high-rate capability, up to a scan rate of 1000 mVs-1. The VACNT electrode electrochemical performance was also measured by galvanostatic charge-discharge and electrochemical impedance spectroscopy. The effect of free standing CNTs direct growth on the current collector makes insulating binder material unnecessary, thus producing better ion accessibilities to its surface. This also contributes to the good and reliable electrochemical supercapacitor performance.

show abstract

“…EDLCs are electrical energy storage devices that undergo the electrostatic or physical separation of charge at the interface between electrode and electrolyte. 26,27 The negative electrode attracts the positively charged cations and the anions are accumulated in the pores of the positive electrode during charging process. These two parallel regions of charge are called electrical double layer interface.…”

mentioning

confidence: 99%

Development of High Performance Electrochemical Capacitor: A Systematic Review of Electrode Fabrication Technique Based on Different Carbon Materials

Manaf

Bistamam

Azam

2013

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

Increasing demand for energy requirement has attracted considerable attention among researchers to develop efficient energy storage device. Among energy storage devices, electrochemical capacitor (EC) has great potential for its capability to deliver more power than batteries and store more energy than conventional capacitors. The electrode or active material is the most crucial factor in determining the device properties. Recently, carbon based materials play significant roles as electrode materials and possesses remarkably significant achievements toward the development of sustainable energy storage applications. Electrode fabrication technique is another important factor to be considered. Hence, this article reviews the electrode fabrication techniques for EC based on different types of carbon as electrode materials, and their EC performances measured by techniques such as cyclic voltammetry and charge discharge characteristics are also discussed.Background.-Nowadays, sustainable energy sources are important and have been utilized in many applications due to the decreasing availability of fossil fuels. 1 Renewable resources such as solar 2 and wind power 3 have the ability to generate electricity, and thus offers high potential for future energy demands. However, these kinds of sources provide limited energy consumption due to the continuous utilization of energy for up to 24 h a day. To overcome this matter, energy storage devices are introduced to achieve an effective level in the cycle of renewable energy sources. 4 A lot of efforts have been put in researching and developing more efficient energy storage system that is more novel, low-cost, environmentally friendly, and better performance to meet the market requirement. 5 Batteries, fuel cells, and electrochemical capacitors (ECs) are among those devices for the newly introduced electrochemical energy storage and conversion. 6 ECs provide the necessary power for acceleration and additionally allow for recuperation of brake energy in hybrid electric vehicle. 7-9 Moreover, ECs are constructed and/or assembled much like a battery and their function is also similar. Function of both batteries and ECs are to store electrical charges. In a basic form, ECs consist of two symmetric electrodes immersed in an electrolyte with a dielectric separator between the electrodes. ECs are generally classified into three types, which are electrochemical double layer capacitor (EDLC), pseudocapacitor, and hybrid capacitor. 8,10,11 The general principle and mechanism of these types of ECs will be discussed in this manuscript.Commonly, fabrication of ECs consists of electrode preparation and cell assembly. Studies about the electrode fabrication technique of ECs are important to successfully produce high performance ECs. Notably, selection of electrode materials has become an essential factor to verify the properties and performances of ECs. 12 Also, simple procedures to fabricate ECs will reduce the fabrication complexity and reduce the number of process steps in fabricating th...

show abstract

The effects of cell assembly compression on the performance of carbon electrochemical double-layer capacitor electrodes

Cited by 10 publications

References 33 publications

Strain induced electrochemical behaviors of ionic liquid electrolytes in an electrochemical double layer capacitor: Insights from molecular dynamics simulations

Strain induced electrochemical behaviors of ionic liquid electrolytes in an electrochemical double layer capacitor: Insights from molecular dynamics simulations

Lithium-Ion Supercapacitor Using Vertically-aligned Carbon Nanotubes from Direct Growth Technique, and its Electrochemical Characteristics

Development of High Performance Electrochemical Capacitor: A Systematic Review of Electrode Fabrication Technique Based on Different Carbon Materials

Contact Info

Product

Resources

About