Simple Rational Model for Discharge of Batteries with Aqueous Electrolytes, Based on Nernst Equation

• 作者: Panagis G. Papadopoulos Christopher G. Koutitas Christos G. Karayannis Panos D. Kiousis Yannis N. Dimitropoulos
• 来源期刊: 物理化学期刊(英文)
• 学科: 工学
• 关键词: BATTERY Aqueous Electrolyte DISCHARGE Nernst Equation Daniel Cell Lead-Acid Battery Temperature Effect
• 年，卷（期）: 2021,（1）
• 页码范围: 1-11
• 页数: 11页
• 分类号: TM9

摘要

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 <span style="font-family:Verdana;">Δ</span><i><span style="font-family:Verdana;">t</span></i><span style="font-family:Verdana;">, is presented, for proposed model. The model is first applied to Daniel cell, in order to clar</span><span style="font-family:Verdana;">ify</span><span style="font-family:""><span style="font-family:Verdana;"> concepts and principles of battery operation. It is found that initial pinching, in time-history curve of voltage </span><i><span style="font-family:Verdana;">E-t</span></i><span style="font-family:Verdana;">, is due to initial under-concentration of product ion. Then, model is applied </span></span><span style="font-family:Verdana;">to</span><span> 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.</span>