Self-discharge and leakage current mitigation of neutral aqueous-based supercapacitor by means of liquid crystal additive

Haque, Mazharul; Li, Qi; Smith, Anderson David; Kuzmenko, Volodymyr; Rudquist, Per; Lundgren, Per; Enoksson, Peter

doi:10.1016/j.jpowsour.2020.227897

Cited by 75 publications

(36 citation statements)

References 53 publications

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“…As expected, the OCV decreases with time and the self‐discharge behavior aggravates with the increase of the initial voltage. Similar behavior has been found in previous studies [35] . This may be because a higher initial voltage means that the supercapacitor is in a higher energy state, and therefore the driving force for self‐discharge is greater, resulting in more severe self‐discharge behavior.…”

Section: Resultssupporting

confidence: 87%

“…Leakage current is also an important parameter to evaluate the self‐discharge behavior of supercapacitor except above voltage attenuation [14,35,36] . As shown in Figure 4d, the leakage current of PCH‐based supercapacitor is much lower than liquid supercapacitor, which is closely related to the high mechanical properties and high‐temperature stability of PCH solid electrolyte (Figure 2d, e).…”

Section: Resultsmentioning

confidence: 98%

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Chain‐Elongated Ionic Liquid Electrolytes for Low Self‐Discharge All‐Solid‐State Supercapacitors at High Temperature

et al. 2021

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High power and good stability enable supercapacitors to work efficiently at high temperatures. However, the high‐temperature‐induced excessive ion transfer of the electrolyte would lead to severe self‐discharge behavior, which has often been overlooked but can be highly detrimental. In this study, solid electrolytes consisting of poly(ethylene oxide) (PEO), bentonite clay, and ionic liquids (IL)‐PEO‐clay@[EMIM][BF4] (PCE), PEO‐clay@[BMIM][BF4] (PCB), and PEO‐clay@[HMIM][BF4] (PCH) lead to dramatic decreases in self‐discharge when used in all‐solid‐state supercapacitors at high temperature of 70 °C, which correlate with chain elongation (i. e., [EMIM+]<[BMIM+]<[HMIM+]). Benefiting from both cation adsorption and high‐temperature stabilization by bentonite clay, PCH‐based supercapacitors (IL=[HMIM][BF4]) deliver an extremely low self‐discharge rate, with only a 30.7 % voltage drop over 10 h at 70 °C (44.5 % for 38 h), which is much lower than that of traditional liquid supercapacitors (63.7 % drop over 10 h at 70 °C). This improvement in high‐temperature self‐discharge behavior is found to be from the decrease in diffusion‐controlled faradaic process. Based on the longer‐chain [HMIM+], soft‐packaged supercapacitors exhibit a low self‐discharge rate and work consistently at 70 °C. This chain‐elongation strategy provides a new possibility for the suppression of self‐discharge behavior in supercapacitors and further aids long‐term energy storage by supercapacitors at high temperatures.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 98%

Chain‐Elongated Ionic Liquid Electrolytes for Low Self‐Discharge All‐Solid‐State Supercapacitors at High Temperature

et al. 2021

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“…Previously, the cells were charged at a current density of 1 A g -1 and stabilized at 0.9 V for 1 h in order to minimize the charge redistribution effect [49]. Leakage currents were recorded at a constant cell voltage during 1 h after galvanostatic charging of the cells at 0.9 V [50][51][52].…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Upgrading of pine tannin biochars as electrochemical capacitor electrodes

Pérez-Rodríguez

Pinto

Izquierdo

et al. 2021

Journal of Colloid and Interface Science

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“…Figure S16, Supporting Information, shows the self‐discharge curves and leakage current of a single supercapacitor at different temperatures of −30, 25, and 80 °C, measured for 60 min. The leakage current was calculated from the self‐discharge curves using Equation (4): [ 51 ]

\begin{matrix} I_{leakage} = C \frac{d V}{d t} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

A Textile‐Based Temperature‐Tolerant Stretchable Supercapacitor for Wearable Electronics

Lee

Jung

Keum

et al. 2021

Adv Funct Materials

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Among the extensive development of wearable electronics, which can be implanted onto bodies or embedded in clothes, textile-based devices have gained significant attention. For daily basis applications, wearable energy storage devices are required to be stable under harsh environmental conditions and different deformational conditions. In this study, a textile-based stretchable supercapacitor with high electrochemical performance, mechanical stability, and temperature tolerance over a wide temperature range is reported. It exhibits high areal capacitances of 28.0, 30.4, and 30.6 mF cm −2 at −30, 25, and 80 °C, respectively, while the capacitance remains stable over three repeated cycles of cooling and heating from −30 to 80 °C. The supercapacitor is stable under stretching up to 50% and 1000 repetitive cycles of stretching. A temperature sensor and an liquid-crystal display are simultaneously driven at temperatures between −20 and 80 °C by the supercapacitors. The supercapacitors are woven into a nylon glove power a micro-light-emitting diode stably regardless of the bending of the index finger. Furthermore, the encapsulated supercapacitors retain the capacitance during being immersed in water for a few days. This study demonstrates the potential application of the fabricated supercapacitor as a wearable energy storage device that works under extreme temperature variations, high humidity, and body movements.

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Self-discharge and leakage current mitigation of neutral aqueous-based supercapacitor by means of liquid crystal additive

Cited by 75 publications

References 53 publications

Chain‐Elongated Ionic Liquid Electrolytes for Low Self‐Discharge All‐Solid‐State Supercapacitors at High Temperature

Chain‐Elongated Ionic Liquid Electrolytes for Low Self‐Discharge All‐Solid‐State Supercapacitors at High Temperature

Upgrading of pine tannin biochars as electrochemical capacitor electrodes

A Textile‐Based Temperature‐Tolerant Stretchable Supercapacitor for Wearable Electronics

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