The characteristics of a Zinc/Air (Zn/Air) primary cell are discussed. In addition, current technologies and the corresponding electrical performance are introduced. The basic principles of operation of a Zn/Air primary cell are discussed, focusing on the anode, cathode, and electrolyte. Basic kinetic and transport expressions are developed for the two main components of the cell: the anode and cathode compartments, based on which an overall formula for the cell polarization is developed. Input parameters are selected and approximated where possible to observe the model¡¦s ability to predict potential versus current density. Time-dependent anode performance is accomplished through the use of the shrinking core reaction model for the discharge of the zinc particles. The time-dependent dimensionless radius of the zinc particle (ď) is then used in conjunction with the developed transport and kinetic expressions for the prediction of the overall cell performance as a function of time. Plots of cell voltage prediction versus time and percent capacity versus time are presented. The simulations indicate an adequate approximate analytic model valid for a variety of drain rates corresponding to current hearing instrument devices in the market.
Identifer | oai:union.ndltd.org:wpi.edu/oai:digitalcommons.wpi.edu:etd-theses-1073 |
Date | 12 January 2005 |
Creators | White, Leo J |
Contributors | Ravindra Datta, Advisor, , |
Publisher | Digital WPI |
Source Sets | Worcester Polytechnic Institute |
Detected Language | English |
Type | text |
Format | application/pdf |
Source | Masters Theses (All Theses, All Years) |
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