Macro Model for Microbatteries

  • Mohammed Shemso Nesro

Student thesis: Master's Thesis

Abstract

Thin-film, solid-state microbatteries represent now a viable alternative for powering small form-factor microsystems or storing the power harvested by energy microsensors. One obstacle to their widespread use in integrated systems has been the absence of a high-fidelity, physics-based, compact model describing their operation and enabling their design and verification in the same CAD environment as integrated systems or energy harvesters. The aim of this master thesis work is to develop and validate such a model using a thorough analysis of the electrochemistry of a thin-film, solid-state Lithium-ion microbattery. Our compact model is based on carefully validating and exploiting the electroneutrality assumption of the thin-film, solid-state electrolyte. Such assumption enables the replacement of the nonlinear partial differential equations describing the microbattery electrochemistry with linear ones without virtually any loss in accuracy. We apply to the latter equations the well-established methodology of Arnoldi-based model order reduction techniques to develop a compact microbattery model capable of reproducing its input-output electrical behavior with less than 1% error with respect to full nonlinear PDE's and of at least 30X in transient simulation speed.
Date of Award2014
Original languageAmerican English
SupervisorIbrahim Elfadel (Supervisor)

Keywords

  • Electric batteries; Electrochemistry; Storage batteries.

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