Nikel-Metal Hidrit ve Lityum-iyon Piller Arasındaki Empedans Spektroskopisinin Karşılaştırmalı Çalışması

Öz

Yaygın olarak kullanılan iki ticari şarj edilebilir pil, nikel-metal hidrit pil ve lityum-iyon pil, hızlı ve etkili bir elektrokimyasal yöntem olan empedans spektroskopisi tekniği ile incelenmiştir. Bu piller aynı potansiyele getirilerek eşit frekans aralığındaki elektrokimyasal empedans özellikleri karşılaştırılmıştır. Pillerin elektrokimyasal karakterizasyonu empedans analizi ve eşdeğer devre modellemesi ile yapılmıştır. Ayrıca geliştirilen eşdeğer devre tabanlı matematiksel model ile enerji depolama sistemleri için önemli olan fiziksel parametreler elde edilmiştir. Elde edilen parametreler, enerji depolama sistemlerinde pil seçimini önemli ölçüde belirleyen pil performansı ve kapasite özellikleri açısından karşılaştırılmıştır. Bu işlemler sonucunda lityum-iyon pilin batarya dinamiği açısından nikel-metal hidrit pile göre birçok avantajı olduğu tespit edilmiştir. Ayrıca, bu çalışmada kullanılan yöntem ve elde edilen modelin laboratuvar ölçekli ve ticari olmayan pillerin geliştirilmesine ve enerji ihtiyacını karşılama kabiliyetlerinin belirlenmesine temel oluşturabileceği düşünülmektedir.

Anahtar Kelimeler

• Elektrokimyasal empedans spektroskopisi
• şarj edilebilir pil
• eşdeğer devre modeli
• pil performansı
• gözenekli elektrot

Comparative Study of Impedance Spectroscopy Between Nickel-Metal Hydride and Lithium-ion Batteries

Öz

Two commonly used commercially available rechargeable batteries, nickel-metal hydride battery and lithium-ion battery, have been investigated by impedance spectroscopy technique, which is a fast and an effective electrochemical method. These batteries were brought to the same potential and their electrochemical impedance properties in the equal frequency range were compared. The electrochemical characterization of the batteries was done by impedance analysis and equivalent circuit modeling. In addition, the physical parameters that are important for energy storage systems have been obtained with the developed equivalent circuit based mathematical model. The obtained parameters were compared in terms of battery performance and capacity characteristics that significantly determine the selection of batteries in energy storage systems. As a result of these processes, it has been determined that the lithium-ion battery has many advantages over the nickel-metal hydride battery in terms of battery dynamics. Furthermore, it is thought that the method used and the model obtained in this study can form the basis for the development of laboratory-scale and non-commercial batteries and to determine their ability to meet energy needs.

Anahtar Kelimeler

• Electrochemical impedance spectroscopy
• rechargeable battery
• equivalent circuit model
• battery performance
• porous electrode

Kaynakça

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