Worcester Polytechnic Institute Electronic Theses and Dissertations Collection

Title page for ETD etd-01125-102801


Document Typethesis
Author NameWhite, Leo J
URNetd-01125-102801
TitleAn Approximate Analytical Model for the Discharge Performance of a Primary Zinc/Air Cell
DegreeMS
DepartmentChemical Engineering
Advisors
  • Prof. Ravindra Datta, Advisor
  • Keywords
  • electrochemistry
  • air
  • performance model
  • zinc
  • performance modeling
  • Date of Presentation/Defense2005-01-12
    Availability unrestricted

    Abstract

    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 (ƒè) 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.

    Files
  • lwhite.pdf

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