General hybrid asymmetric capacitor model: Validation with a commercial lithium ion capacitor

Campillo-Robles, Jose Miguel; Artetxe, X.; Sánchez, Karmele del Teso; Gutiérrez, César; Macicior, Haritz; Röser, Stephan; Wagner, Ralf; Winter, Martin

doi:10.1016/j.jpowsour.2019.03.121

Cited by 34 publications

(18 citation statements)

References 70 publications

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“…For example, during charge, the positive electrode incorporates anions adsorption and the negative electrode takes in cations in reductive ion insertion; during discharge, the ion migration direction is reversed. The trade-off between ECs and LIBs of LICs recently received much attention due to their excellent energy-power characters and long lifespan [21][22][23]. However, the state-of-the-art aqueous lithium-ion hybrid capacitors (ALICs) have been limited with their narrow electrochemical stability window of the water (~ 1.23 V) and sluggish diffusion in the bulk of battery-type materials.…”

Section: Introductionmentioning

confidence: 99%

Niobium Tungsten Oxide in a Green Water-in-Salt Electrolyte Enables Ultra-Stable Aqueous Lithium-Ion Capacitors

et al. 2020

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HIGHLIGHTS • A green water-in-salt electrolyte was developed using lithium acetate as solute with a wide electrochemical stability window of 2.8 V. • Molecular dynamics simulation confirmed the nature of water-in-salt electrolyte, where hydrogen bonds of water-water were disrupted and ionic interactions became stronger than dilute solution. • Nb 18 W 16 O 93-based lithium-ion capacitors delivered unexceptionable stability over 50,000 cycles.

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Section: Introductionmentioning

confidence: 99%

Niobium Tungsten Oxide in a Green Water-in-Salt Electrolyte Enables Ultra-Stable Aqueous Lithium-Ion Capacitors

et al. 2020

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“…UCs are gaining popularity in many industries as a reliable energy storage device because of their specific properties: larger capacitance, high power density, high energy density, and fast charging. Among existing UC-based storage technologies [4][5][6][7][8][9][10], symmetric double-layer UCs [5] and asymmetric Li-ion hybrid UCs [6][7][8] exhibit superior behavior to that of others. Alizadeh et al showed that the application of UCs improves the performance of microgrid frequency regulation as a result of improved virtual system inertia [11].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study on Dynamic Parameters of Symmetric and Asymmetric Ultracapacitors

et al. 2019

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Electrical storage components such as ultracapacitors (UC) have received significant attention from various industrial sectors, from electric vehicles to renewable power plants. This article presents the investigations on dynamic properties of asymmetric Li-ion hybrid (CPQ2300S: 2300 F, 2.2-3.8 V, JSR Co., Tokyo, Japan) and symmetric double-layer (BCAP3400: 3400 F, 2.85 V, Maxwell Technologies Co., San Diego, CA, USA) ultracapacitors. The internal resistance and capacitance of both UCs were slightly changed with respect to current and voltage alterations, but these changes were more prominent for the Li-ion UC. The internal resistance of the Li-ion UC became five times larger and its capacitance decreased significantly when the temperature decreased from +25 • C to −20 • C. More importantly, the double-layer UC exhibited nearly constant capacitance for a wide range of temperature changes (0 • C to −40 • C), although internal resistance increased somewhat. Electrochemical impedance spectroscopy analysis of both UCs was performed for the frequency range of 1 Hz-1 kHz and in the temperature range from −15 • C to +30 • C. It was observed that the temperature effects were much more pronounced for the asymmetric Li-ion UC than that of the symmetric double-layer UC. This work also proposes an improved equivalent circuit model based on an infinite number of resistance-capacitance (r-C) chains. The characteristic behavior of symmetric UCs can be explained precisely by the proposed model. This model is also applicable to asymmetric UCs, but with less precision. similar asymmetric UCs are also applicable to pulsed electric power sources [12,13]. Piórkowski et al. presented a case study about the application of UCs in hybrid systems including an engine start module (ESM), a photovoltaic (PV) module, a battery, and an internal combustion engine (ICE) [14]. In continuation, the hybrid model control strategy was proposed for a double active bridge-based supercapacitor energy storage system [15]. More importantly, the service lifetime of UCs is three times higher compared to electrochemical storage batteries (e.g., Li-ion or lead-acid) although UCs are relatively bulky and voluminous [16]. Consequently, there is a lack of accurate information regarding the ability of Li-ion UCs to provide voltage and current during charge-discharge cycles. Previously, a significant number of experimental investigations were carried out [16][17][18][19][20][21][22] in order to understand the characteristic behavior of UCs. Different direct measurement methods for the evaluation of UC parameters were also proposed [16][17][18][19][20]. A comprehensive review of characterization methods for supercapacitor modeling and general parameter identification techniques were also discussed [21,22].A significant amount of effort has been made to describe dynamic UC behavior using different types of equivalent circuits [23][24][25][26][27][28][29][30]. Some works presented modeling approaches based on electrochemical explanations of UC performance [31][32][33...

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“…From this equation, when I n 1 becomes large, C n 1 becomes small. This equation is applied not only to lead-acid and Li-ion batteries but also to Electric Double-Layer Capacitors (EDLCs) [33] and LICs [34,35,36] in the wide current range.…”

Section: Discussionmentioning

confidence: 99%

Investigation of Charging Efficiency of a Lithium-ion Capacitor during Galvanostatic Charging Method

Nakata

2019

Materials

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The charging efficiency of a lithium-ion capacitor (LIC) is an important problem. Until now, due to the stepwise charging method, the charging efficiency of 95.5% has been realized. However, the problem is that the issue of what level the charging efficiency can be increased to, is yet to be well investigated. In this article, the problem is investigated under the galvanostatic charging condition. The charging efficiency is measured as a function of the charging current. As a result, it can be more than 99.5% when the charging is quasi-static, in other words, an adiabatic process is realized. Next, the problem of how much energy can be taken out from the energy-stored capacitor is investigated with a load resistor circuit. It is clarified that the discharging energy from the capacitor is equal to the stored energy in the case when a load resistor is used and the discharging is quasi-static. It is confirmed that LICs are suitable for use as energy storage devices.

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General hybrid asymmetric capacitor model: Validation with a commercial lithium ion capacitor

Cited by 34 publications

References 70 publications

Niobium Tungsten Oxide in a Green Water-in-Salt Electrolyte Enables Ultra-Stable Aqueous Lithium-Ion Capacitors

Niobium Tungsten Oxide in a Green Water-in-Salt Electrolyte Enables Ultra-Stable Aqueous Lithium-Ion Capacitors

Comprehensive Study on Dynamic Parameters of Symmetric and Asymmetric Ultracapacitors

Investigation of Charging Efficiency of a Lithium-ion Capacitor during Galvanostatic Charging Method

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