Modeling of Cylindrical Alkaline Cells: III . Mixed‐Reaction Model for the Anode

Abstract

q ABSTRACTA mixed-reaction model has been developed to simulate the discharge behavior of cylindrical alkaline zinc-manganese dioxide primary cells. The analysis of the system considers a whole prismatic cell consisting of a zinc amalgam anode, an inert porous separator, and a manganese dioxide cathode. The domain of investigation extends from the anode to the cathode current collector. The model is based on a macrohomogeneous theory of porous electrodes and includes considerations for the ohmic potential drop, diffusion and convection in the electrolyte, change in porosity and electrolyte composition due to chemical and electrochemical reactions, charge-transfer effects, and ionic transport in a concentrated electrolyte. The anode is considered to be a reversible, nonpolarizable electrode with two anodic reactions occurring simultaneously. A parameter which is based on the ratio of the extent of the two reactions is used to characterize the anode-mixed reactions. A solid-state proton diffusion as well as a direct charge transfer are used to describe the cathodic reaction. The performance between cells of different sizes is compared at the same galvanostatic discharge rates per unit cathode mass. Sources of polarization are identified, and the influence of cell behavior by the different operating variables are examined. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.182.74 Downloaded on 2015-06-26 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.182.74 Downloaded on 2015-06-26 to IP ABSTRACTA dissolution-precipitation model has been developed to simulate the discharge behavior of cylindrical alkaline zinc-manganese dioxide primary cells. The model is based on the macrohomogeneous theory of porous electrodes with the domain of investigation extending from the anode/anode current collector interface to the cathode/cathode current collector interface. The performance between cells of different sizes is compared at the same galvanostatic discharge rate per unit cathode mass. The reaction distribution, electrolyte concentration, overpotential, and porosity as a function of time and location in the cylindrical alkaline cell are presented.

Electrochemical characterization and application of Ni-RuO2 as a pH sensor for determination of petroleum oil acid number

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Rechargeability and economic aspects of alkaline zinc–manganese dioxide cells for electrical storage and load leveling

“…E eq then was used to calculate the local cathode overpotential h as given in Equation (A-19). As the anode was non-limiting, the anode equilibrium potential for the anode was taken to be constant at À1.4 V vs Hg/HgO [23]. Table 3 lists the parameters used in the model.…”

“…For the negative Zn electrode i 0 is taken as constant [23]. As the Zn electrode was not the limiting electrode and material utilization was low, precipitation of ZnO within the electrode pore space was neglected.…”

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