Supercapacitors Using Binder-Free &amp; Surfactant-Free CNT Electrodes

Brahim, Sean; Indra, Erik M.; Zhang, Sanliang; Sy, Ramon; Bonzato, Paul; Maat, S.

doi:10.1149/07524.0013ecst

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…Detailed information regarding the pouch cells is available in previous studies. [20][21][22] Among the six pouch cells, three used acetonitrile (ACN) electrolyte, and the other three used propylene carbonate (PC) electrolyte. The ESR (impedances at 1 kHz) for ACN and PC cells were approximately 200 mΩ and 500 mΩ respectively.…”

Section: Resultsmentioning

confidence: 99%

Rapid Analytical Instrumentation for Electrochemical Impedance Spectroscopy Measurements

Brahim

Maat

et al. 2020

J. Electrochem. Soc.

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This work reports a low-cost custom electrochemical instrument capable of performing rapid and accurate electrochemical impedance spectroscopy (EIS) for supercapacitors over a broad frequency band (10 mHz to 2 kHz). Conventionally, EIS is measured via sinusoidal perturbations; however, such an approach suffers from lengthy measurement time. Chirp signals have been shown previously to reduce EIS measurement time for supercapacitors for relative narrow frequency bands (1 Hz to 2 kHz). However, to characterize supercapacitors comprehensively, much broader frequency bands are required. Here, we present a custom instrument with an adaptive measurement algorithm for performing EIS measurements in a wide frequency range of 10 mHz to 2 kHz with low measurement uncertainties. The results obtained using this new technique has been validated here with a commercial instrument on several types of supercapacitors. Furthermore, measurement time on average decreases from 1500 s to less than 400 s. The overall cost of the custom instrument is 90% lower as compared to the commercial instrument. The custom instrument’s accuracy, time efficiency and low cost are expected to benefit electrochemical researchers.

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Section: Resultsmentioning

confidence: 99%

Rapid Analytical Instrumentation for Electrochemical Impedance Spectroscopy Measurements

Brahim

Maat

et al. 2020

J. Electrochem. Soc.

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“…Theorem 7. Consider agents with dynamics (2) and is given by (13) and (14), where (⋅) satisfies Assumption 1 for all ∈ ], (⋅) satisfies Assumption 2 for all ( , ) ∈ , and (⋅) satisfies Assumption 3 for all ∈ ]…”

Section: Consensus For Double-integrator Dynamics With State-dependenmentioning

confidence: 99%

“…In this section, we are going to apply our theory to realize voltage equalization for supercapacitor which is an efficient energy storage element with some significant advantages, like high power density, extremely high cycling capability, and being environment friendly as introduced by [11][12][13].…”

Section: Voltage Equalization For Supercapacitorsmentioning

confidence: 99%

Distributed Control of Multiple Supercapacitors via Static Feedback

Luo

Sun

Peng

2019

Mathematical Problems in Engineering

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During recent years, many important distributed control approaches have been proposed to realize the stabilization of networked system including static feedback, which has been proven to be an efficient control strategy. Based on its traditional design method, for first-and second-order networked dynamical systems, we propose another kind of nonlinear consensus controllers where the input of each agent can be written as a product of a nonlinear gain and a sum of nonlinear interaction functions so that all states will reach consensus at a value preset. By using integral Lyapunov functions, we can prove the stability of proposed control protocols. We also choose supercapacitors as simulation models to realize voltage equalization under our distributed control protocols.

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