Modeling and Simulation of Electrochemical Impedance Spectra in Lithium-Air Batteries

Mehta, Mohit; Andrei, Petru

doi:10.1149/06115.0039ecst

Cited by 3 publications

(3 citation statements)

References 30 publications

(55 reference statements)

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“…In order to compute the impedance spectra we apply the small-signal analysis theory to the transport equations and solve the final linear system of equations numerically. For more information about this technique we recommend (8,9). Let us assume that there is a small-signal external perturbation in the value of the discharge current jt ie ω  .…”

Section: Computation Of Impedance Spectramentioning

confidence: 99%

Statistical Analysis of Li-Oxygen Batteries

Mehta¹,

Zhu

Andrei

2017

ECS Trans.

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In this article we develop a mathematical model and analyze the variability of discharge characteristics and impedance spectra in Li-air batteries with organic electrolyte. These batteries are well known to display a large variability of their characteristics from battery to battery (particularly of their specific capacity, energy and power densities), however, the exact reasons of this variability are still under investigation. Our model shows that the intrinsic variability of the pore microstructure which include the variability of the porosity and specific area from one macroscopic location to another macroscopic location inside the same battery and from one battery to another battery can be, at least in part, responsible for the large discrepancy of the results reported in the literature for the discharge characteristics and impedance spectra. It is shown that, while the variance of the specific capacity decreases slightly when the discharge current of the cell is increasing, the relative varianceto-mean ratio increases dramatically.

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Section: Computation Of Impedance Spectramentioning

confidence: 99%

Statistical Analysis of Li-Oxygen Batteries

Mehta¹,

Zhu

Andrei

2017

ECS Trans.

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“…If the value of the a.c. current perturbation i  is given, Eq. [19] can be written as a linear system of equations for the a.c. values of the state variables,  y…”

Section: Computation Of Impedance Spectramentioning

confidence: 99%

“…The effects of the pore radius distribution on the impedance spectra will be analyzed in a future article (19).…”

mentioning

confidence: 99%

The Effect of Discharge Products on the Impedance Spectra in Li-Air Batteries with Organic Electrolyte

Mehta¹,

Bevara²,

Andrei³

2015

ECS Trans.

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The effects of discharge products on the impedance spectra of Li-air batteries with organic electrolyte are studied using finite element simulations. The finite element simulations are based on the theory of concentrated solutions and the complex impedance spectra are computed by linearizing the partial differential equations that describe the mass and charge transport in Li-air batteries. These equations include the oxygen diffusion equation, the Li drift-diffusion equation, and the electron conduction equation. The reaction at the anode and cathode are described by Butler-Volmer kinetics. The total impedance of a Li-air battery increases by more than 200% when the response is measured near the end of the discharge cycle as compared to on a fresh battery. The resistivity of the deposition layer significantly affects the deposition profile and the total impedance. Using electrolytes with high oxygen solubility and concentrated oxygen gas at high pressures will reduce the total impedance of Li-air batteries.

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