Serdar ALTIN, Abdurrahman YOLUN, Erdinç ÖZ, Sebahat ALTUNDAĞ

Maricite NaFePO4 Katot Malzemesinin Üretimi ve Elektrokimyasal Özellikleri

Enerji üretimi ve depolama teknolojilerinin kullanımı son yıllarda büyük bir önem kazanmıştır. Sodyum iyon piller (Na-iyon) alanındaki gelişmelere bakıldığında düşük maliyetlerinden dolayı lityum iyon (Li-iyon) pillere alternatif olarak yakın gelecekte ümit vadetmektedir. Na-iyon pilleri bu kadar cazip hale getiren başlıca nedenler lityum ile benzer kimyasal özelliklere sahip olması ve üretim maliyetlerinin daha düşük olmasıdır. Bu çalışmada NaFePO4 katot malzemesinin üretiminde iki kademeli ısıl işlem ile katı hal reaksiyon yöntemi uygulanmıştır. Üretilen malzemelerin fiziksel karekterizasyonları için XRD, SEM, FTIR kullanılmış, manyetik özellikleri ise χ-T analizleri ile incelenmiştir. Pillerin performansını ve elektrokimyasal özelliklerini araştırmak için üretilen katot malzemeleri CR2032 düğme pil haline getirilerek döngüsel voltametri (CV) ve kapasite ölçümleri yapılmıştır. NaFePO4 katot malzemesinin XRD analizlerinde safsızlık fazları gözlenmemiştir. Pil haline getirilmiş katot materyallerinin 1,5-4,0 V aralığında 100 döngülük kapasite değeri ölçülmüş, ilk deşarj kapasitesinin 26,29 mAh g-1 olduğu ve 100. döngü sonunda kapasite değerinin ilk döngüye oranla %10.99 arttığı gözlemlenmiştir.

Anahtar Kelimeler:

Şarj edilebilir pil, katot malzemesi, sodyum, NaFePO4

Production and Electrochemical Properties of Maricite NaFePO4 Cathode Material

The use of energy generation and storage technologies has gained great importance in recent years. Considering the developments in the field of sodium ion batteries (Na-ion), because of their low cost, these materials will be an alternative to lithium ion (Li-ion) batteries in the near future. The important reasons that make Na-ion batteries so attractive are that they have similar chemical properties with lithium and their production costs are lower. In this study, NaFePO4 cathode material was produced by applying two-steps heat treatments with solid state reaction method. For the structural characterization of produced materials XRD, SEM, FTIR were used and their magnetic properties were investigated by χ-T analyzes. Cyclic voltammetry (CV) and capacity measurements were made to investigate the battery performance and electrochemical properties of cathode materials. There was not observed impurity phases in XRD analysis in the structure of the NaFePO4 cathode material. The capacity of cathode materials has been measured for 100 cycles in the 1.5-4.0 V range. It was observed that the initial discharge capacity of this battery was 26.29 mAh g-1 and the capacity value increased %10.99 at the end of the 100th cycle.

Keywords:

Rechargeable battery, cathode material, sodium, NaFePO4,

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