Supercapacitor Thermal Modeling and Characterization in Transient State for Industrial Applications

This paper reviews recent advances in physical modeling of interfacial and transport phenomena in electric double layer capacitors (EDLCs) under both equilibrium and dynamic cycling. The models are based on continuum theory and account for (i) the Stern layer at the electrode/electrolyte interface, (ii) finite ion sizes, (iii) steric repulsions, (iv) asymmetric electrolytes featuring ions with different valencies, effective diameters, or diffusion coefficients, (v) electric-field-dependent dielectric permittivity of the electrolyte, and/or (vi) porous three-dimensional morphology of the electrodes. Typical characterization methods such as electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic cycling were reproduced numerically to identify the dominant physical phenomena and to gain insight into experimental observations. In addition, recent thermal models derived from first principles for EDLCs under constant-current cycling accounting for irreversible Joule heating and reversible heat generation rates due to ion diffusion, steric effects, and changes in entropy are discussed. Scaling analyses of both equilibrium and dynamic models are also presented as a way to identify self-similar and asymptotic behaviors as well as to develop design rules for electrodes and electrolytes of next generation EDLCs. Electrical double layer capacitors (EDLCs) store energy by ion adsorption in the electrical double layer (EDL) forming at the electrode/electrolyte interfaces.1,2 This process is highly reversible and the cycle life of EDLCs exceeds 100,000 cycles.2,3 EDLCs can operate in a wide range of specific energy and power densities. This versatility is a key feature for electrical energy storage, energy harvesting, and energy regeneration applications. 2The performance of EDLCs is determined by the combination of the electrode material and morphology and of the electrolyte. In general, the key attributes of a good electrode include 1,3-7 (i) large surface area accessible to ions to maximize charge storage, (ii) optimum pore size, short pore length, and good pore connectivity to facilitate ion transport, (iii) large electrical conductivity to enable fast charging and discharging and low ohmic resistance, (iv) thin electrodes and current collectors to reduce the total resistance of the device, (v) small leakage current, (vi) small self-discharge, (vii) environmentally friendly materials, and (viii) low price. However, satisfying all these criteria simultaneously is challenging. For example, increasing surface area often results in larger electrode electrical resistivity.1 Micropores with diameter less than 2 nm contribute greatly to EDLCs capacitance.2 But pores smaller than the ion size are typically inactive and do not contribute to charge storage. 1,8 Porous electrodes must also be electrochemically accessible to ions. Then, interconnected mesopores with diameter ranging from 2 to 50 nm are necessary for fast charging thanks to their easier accessibility to ions. 1,6,[9][10][11] In practice, electrode...

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“…Based on the equivalent series RC circuit, the resistance and differential capacitance per unit surface area are given by 41,[87][88][89]96 …”

Section: Journal Of the Electrochemical Society 162 (5) A5158-a5178 mentioning

confidence: 99%

Recent Advances in Continuum Modeling of Interfacial and Transport Phenomena in Electric Double Layer Capacitors

Pilon

Wang

d’Entremont

2015

J. Electrochem. Soc.

117

105

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“…These textile fabrics having new surface features allow producers to apply new production methods to achieve an unprecedented spectrum of material science applications in textile form. Such innovative materials find application areas in technical textiles [1] such as energy harvesting and storage [2,3].…”

Section: Introductionmentioning

confidence: 99%

Projection of Sciences Onto Textile and Fashion: Nano-Technology and Chargeable Fabric Example

Çobanoğlu¹

2015

Tekstil ve Mühendis

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Bu makaleye atıf yapmak için (To cite this article):Özgür ÇOBANOĞLU, Jitka ERYILMAZ, Mehmet Fatih ATAŞALAN, Semih KAZANÇ (2015) ABSTRACT: This proceeding provides readers with an overview of our multidisciplinary approach to technical textile research through reviewing recent preliminary results of an example project aiming at developing supercapacitor fabric structures. The fundamental idea of the project is based on, production of graphene nano-sheets and their application onto textile fabric, growing the oxides of manganese on graphene coating and utilization of the final fabric within a suitable electrolyte as electrode material. Graphene nano-sheet production and characterization methods, application to textile fabric and surface resistance measurements as well as construction of super-capacitor architecture and characterization of the final device capacitance via electrochemistry are presented.Keywords: Nano-technology, graphene, super-capacitor, wearable technology, storage, battery TEMEL BİLİMLERİN TEKSTİL VE MODA ÜZERİNE İZDÜŞÜMÜ: NANO-TEKNOLOJİ VE ŞARJ EDİLEBİLİR KUMAŞ ÖRNEĞİÖZET: Bu çalışma, araştırma grubumuzun teknik tekstile olan çok-disiplinli yaklaşımını, elektriksel olarak doldurulabilir kumaş geliştirme proje örneği üzerinden sunacak ve projenin son durumunu, verilerle destekleyerek aktaracaktır. Bahsi geçen proje grafen nano-yüzey üretimi, tekstil kumaşını oluşturan elyafın grafen nanoyüzeyler ile kaplanması ve bunların üzerinde manganez elementinin oksitlerinin büyütülmesi ile uygun bir elektrolit içinde elektrot malzemesi olarak kullanılması fikrine dayalı olarak kurgulanmıştır. Bu çalışma, grafen nano-yüzey üretimi ve karakterizasyonu, kumaşa uygulanması ve kumaşın yüzey iletkenliğinin ölçülmesi, üs-tün-sığa mimarisinin oluşturulması ve elektro-kimyasal karakterizasyon ile sığanın ölçülmesi ayrıntılarını aktaracaktır.

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“…De Levie [11] developed a theory on the capacitance in each pore of porous electrodes being modeled as an RC transmission line. Previous thermal models predicted the thermal behavior of a UC by solving the transient heat conduction equation in one- [12], two- [13,14], or three-dimensional space [15][16][17]. Most of those thermal models [13,[15][16][17] neglected the reversible heat generation in a UC cell.…”

Section: Introductionmentioning

confidence: 99%

“…Previous thermal models predicted the thermal behavior of a UC by solving the transient heat conduction equation in one- [12], two- [13,14], or three-dimensional space [15][16][17]. Most of those thermal models [13,[15][16][17] neglected the reversible heat generation in a UC cell. Schiffer et al [18] showed that the heat generation in a UC cell consists of an irreversible Joule heat and a reversible heat caused by a change of entropy based on the analysis of the thermal measurement data obtained for a UC.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling of the Electrical and Thermal Behaviors of an Ultracapacitor

Lee

Kim

et al. 2014

Energies

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This paper reports a modeling methodology to predict the electrical and thermal behaviors of a 2.7 V/650 F ultracapacitor (UC) cell from LS Mtron Ltd. (Anyang, Korea). The UC cell is subject to the charge/discharge cycling with constant-current between 1.35 V and 2.7 V. The charge/discharge current values examined are 50, 100, 150, and 200 A. A three resistor-capacitor (RC) parallel branch model is employed to calculate the electrical behavior of the UC. The modeling results for the variations of the UC cell voltage as a function of time for various charge/discharge currents are in good agreement with the experimental measurements. A three-dimensional thermal model is presented to predict the thermal behavior of the UC. Both of the irreversible and reversible heat generations inside the UC cell are considered. The validation of the three-dimensional thermal model is provided through the comparison of the modeling results with the experimental infrared (IR) image at various charge/discharge currents. A zero-dimensional thermal model is proposed to reduce the significant computational burden required for the three-dimensional thermal model. The zero-dimensional thermal model appears to generate OPEN ACCESSEnergies 2014, 7 8265 the numerical results accurate enough to resolve the thermal management issues related to the UC for automotive applications without relying on significant computing resources.

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Supercapacitor Thermal Modeling and Characterization in Transient State for Industrial Applications

Cited by 100 publications

References 23 publications

Recent Advances in Continuum Modeling of Interfacial and Transport Phenomena in Electric Double Layer Capacitors

Recent Advances in Continuum Modeling of Interfacial and Transport Phenomena in Electric Double Layer Capacitors

Projection of Sciences Onto Textile and Fashion: Nano-Technology and Chargeable Fabric Example

Modeling of the Electrical and Thermal Behaviors of an Ultracapacitor

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