Simple Rational Model for Discharge of Batteries with Aqueous Electrolytes, Based on Nernst Equation
Open Access
- 1 January 2021
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Open Journal of Physical Chemistry
- Vol. 11 (01), 1-11
- https://doi.org/10.4236/ojpc.2021.111001
Abstract
A simple rational model is proposed for discharge of batteries with aqueous electrolytes, based on Nernst equation. Details of electrode kinetics are not taken into account. Only a few overall parameters of the battery are considered. A simple algorithm, with variable time step-length Δt, is presented, for proposed model. The model is first applied to Daniel cell, in order to clarify concepts and principles of battery operation. It is found that initial pinching, in time-history curve of voltage E-t, is due to initial under-concentration of product ion. Then, model is applied to a lead-acid battery. In absence of an ion product, and in order to construct nominator of Nernst ratio, such an ion, with coefficient tending to zero, is assumed, thus yielding unity in nominator. Time-history curves of voltage, for various values of internal resistance, are compared with corresponding published experimental curves. Temperature effect on voltage-time curve is examined. Proposed model can be extended to other types of batteries, which can be considered as having aqueous electrolytes, too.Keywords
This publication has 6 references indexed in Scilit:
- Effect of Elevated Temperature Annealing on Nafion/SiO2 Composite Membranes for the All-Vanadium Redox Flow BatteryPolymers, 2018
- Redox Flow Batteries: Fundamentals and ApplicationsPublished by IntechOpen ,2017
- Reversible chemical delithiation/lithiation of LiFePO4: towards a redox flow lithium-ion batteryPhysical Chemistry Chemical Physics, 2012
- ElectrochemistryPublished by Springer Science and Business Media LLC ,2012
- A Low-Cost, High Energy-Density Lead/Acid BatteryElectrochemical and Solid-State Letters, 2004
- IntroductionPublished by Elsevier BV ,1997