Model based quantification of air-composition impact on secondary zinc air batteries

Schröder, Daniel; Krewer, Ulrike

doi:10.1016/j.electacta.2013.11.116

Cited by 59 publications

(68 citation statements)

References 40 publications

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“…Previous studies simulated ZABs with alkaline KOH electrolytes . Although much of the same methodology may be applied to ZABs with neutral electrolytes, there is one significant gap.…”

Section: Introductionsupporting

confidence: 75%

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Rational Development of Neutral Aqueous Electrolytes for Zinc–Air Batteries

2017

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Neutral aqueous electrolytes have been shown to extend both the calendar life and cycling stability of secondary zinc–air batteries (ZABs). Despite this promise, there are currently no modeling studies investigating the performance of neutral ZABs. Traditional continuum models are numerically insufficient to simulate the dynamic behavior of these complex systems because of the rapid, orders‐of‐magnitude concentration shifts that occur. In this work, we present a novel framework for modeling the cell‐level performance of pH‐buffered aqueous electrolytes. We apply our model to conduct the first continuum‐scale simulation of secondary ZABs using aqueous ZnCl2–NH4Cl as electrolyte. We first use our model to interpret the results of two recent experimental studies of neutral ZABs, showing that the stability of the pH value is a significant factor in cell performance. We then optimize the composition of the electrolyte and the design of the cell considering factors including pH stability, final discharge product, and overall energy density. Our simulations predict that the effectiveness of the pH buffer is limited by slow mass transport and that chlorine‐containing solids may precipitate in addition to ZnO.

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“…Previous studies simulated ZABs with alkaline KOH electrolytes . Although much of the same methodology may be applied to ZABs with neutral electrolytes, there is one significant gap.…”

Section: Introductionsupporting

confidence: 75%

“…Previouss tudies simulated ZABs with alkaline KOH electrolytes. [1,[29][30][31][32] Although much of the same methodology may be appliedt oZ ABs with neutral electrolytes, there is one significant gap. The strongly alkaline composition of standard roughly 30 wt %K OH electrolytes helps maintain ac onstant pH value during operation.…”

Section: Introductionmentioning

confidence: 99%

Rational Development of Neutral Aqueous Electrolytes for Zinc–Air Batteries

2017

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“…On the other side, the effect of the air composition and atmospheric carbon dioxide on the battery's cycle performance has been explored without resolving the nonuniform reaction distribution of the Zn anode. The model confirmed the reduction of lifetime due to carbonization of the alkaline electrolyte [18].…”

Section: Introductionsupporting

confidence: 69%

Computational Fluid Dynamics Approach for Performance Prediction in a Zinc–Air Fuel Cell

et al. 2018

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Abstract:In this study, we investigated the development of a computational fluid dynamics (CFD) model for simulating the physical and chemical processes in a zinc (Zn)-air fuel cell. Theoretically, the model was based on time-dependent, three-dimensional conservation equations of mass, momentum, and species concentration. The complex electrochemical reactions occurring within the porous electrodes were described by the Butler-Volmer equation with velocity, pressure, current density, and electronic and ionic phase potentials computed in electrodes. The Zn-air fuel cell for the present study comprised of four major components, such as a porous Zn anode electrode, air cathode electrode, liquid potassium hydroxide (KOH) electrolyte, and air flow channels. The numerical results were first compared with the experiments, showing close agreement with the predicted and experimental values of the measured voltage-current data of a single Zn-air fuel cell. Numerical results also exhibited mass fraction contours of oxygen (O 2 ) and zinc oxide (ZnO) in the mid-cross-sectional plane. A parametric study was extended to assess the performance of a Zn-air fuel cell at various cathode and electrolyte parameters.

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“…Furthermore, the effects of electrolyte concentration, temperature, and flow velocity on Zn deposit morphology have also been investigated . Computer‐aided design has also been implemented to elucidate air‐flow influences on ZAFCs . By contrast, research on electrolyte flow management (which improves cell voltage) has been limited because clarifying the correlation between operation parameters is difficult due to the sophisticated system designs of ZAFCs.…”

Section: Introductionmentioning

confidence: 99%

The optimization of electrolyte flow management to increase the performance of Zn–air fuel cells

2020

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Summary Zinc (Zn)–air fuel cells (ZAFCs) are one of the potential alternatives to fossil fuels. Because a flowing electrolyte can directly affect cell performance, we focused on the electrolyte management of a ZAFC. The ZAFC galvanostatic discharge was examined to determine its performance. The electrolyte concentration, temperature, and circulation rate were used as the operating parameters for discharge tests, and the relationship between electrolyte and cell performance was discussed based on the experimental results. To elucidate the effect of electrolyte‐flow, the computation fluid dynamic simulations have been first performed. The results revealed that the cell performance associating the remnant oxygen in the electrolyte channel

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Model based quantification of air-composition impact on secondary zinc air batteries

Cited by 59 publications

References 40 publications

Rational Development of Neutral Aqueous Electrolytes for Zinc–Air Batteries

Rational Development of Neutral Aqueous Electrolytes for Zinc–Air Batteries

Computational Fluid Dynamics Approach for Performance Prediction in a Zinc–Air Fuel Cell

The optimization of electrolyte flow management to increase the performance of Zn–air fuel cells

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