AB2O4 Spinel Tipi Yüksek-Entropili Oksitlerin Sentezi ve Elektrokimyasal Performansları

Yıl 2024, Cilt: 11 Sayı: 1, 86 - 92, 31.05.2024

Ersu Lökçü

https://doi.org/10.35193/bseufbd.1249131

Öz

Yüksek entropili oksitler, sahip oldukları yüksek performanslı lityum depolama özellikleri sayesinde, araştırmacılar tarafından yoğun bir şekilde çalışılmaktadır. Bu çalışmada da Li-iyon pillerde alternatif anot malzemesi olarak kullanılması öngörülen spinel yapılı yüksek entropili oksitler olan (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)Fe2O4 ve (Fe0.2Co0.2Ni0.2Cr0.2Mn0.2)Fe2O4, geleneksel katı hal yöntemiyle 1300 °C’ de sentezlenmiştir. Sentezlenen oksitlerin yapısal karakterizasyonları XRD, SEM ve FTIR teknikleri kullanılarak gerçekleştirilmiştir. Ardından Li-iyon yarı hücrelerde anot olarak elektrokimyasal performansları belirlenmiştir. (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)Fe2O4 ve (Fe0.2Co0.2Ni0.2Cr0.2Mn0.2)Fe2O4 elektrotlarının ilk deşarj kapasiteleri sırasıyla 1688 mA sa. g-1 ve 1265 mA sa. g-1 olup bunlara karşılık gelen başlangıç kolumbik verimlilikleri de %80,8 ve %84,4 olarak belirlenmiştir. Numuneler yapılarındaki elektrokimyasal olarak aktif/inaktif katyon oranlarından dolayı çevrim kararlılığı ve kapasite açısından farklı performanslar sergilemiştir. Bu nedenle, bu çalışma, Li-iyon piller için çeşitli kimyasal kombinasyonlar ile tasarlanacak yeni yüksek entropili oksit esaslı anotlarının geliştirilmesi için bir bakış açısı sunmaktadır.

Anahtar Kelimeler

Yüksek Entropili Oksit, Anot, Li-iyon piller

Synthesis and Electrochemical Performances of AB2O4 Spinel Type High-Entropy Oxides

Öz

Due to their high-performance lithium storage properties, high-entropy oxides are being intensively studied by researchers. In this study, spinel structured high entropy oxides (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)Fe2O4 and (Fe0.2Co0.2Ni0.2Cr0.2Mn0.2)Fe2O4, which are projected to be used as alternative anode materials in Li-ion batteries, were synthesized using the conventional solid-state method at 1300 °C. The structural characterization of the synthesized oxides was performed using XRD, SEM, and FTIR techniques. Subsequently, the electrochemical performances of the oxides as anodes in Li-ion half-cells were determined. The initial discharge capacities of (Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)Fe2O4 and (Fe0.2Co0.2Ni0.2Cr0.2Mn0.2)Fe2O4 electrodes are 1688 mA h g-1 and 1265 mA h g-1 respectively and their corresponding initial columbic efficiencies were calculated as 80.8% and 84.4%. Due to the ratios of electrochemically active/inactive cations in their structures, they displayed varying cycling stability and capacity performances. Thus, this study provides a perspective for the development of new high-entropy oxide- based anodes for lithium-ion batteries to be designed with various chemical combinations.

Anahtar Kelimeler

High Entropy Oxide, Anode, Li-ion batteries

Kaynakça

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