Serdar ALTIN, Abdurrahman YOLUN, Sebahat ALTUNDAĞ, Erdinç ÖZ

Maricite $NaFePO_4$ 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 lityumiyon (Li-iyon) pillere alternatif olarak yakın gelecekte ümit vadetmektedir. Na-iyon pilleri bu kadarcazip hale getiren başlıca nedenler lityum ile benzer kimyasal özelliklere sahip olması ve üretimmaliyetlerinin daha düşük olmasıdır. Bu çalışmada $NaFePO_4$ katot malzemesinin üretiminde ikikademeli ısıl işlem ile katı hal reaksiyon yöntemi uygulanmıştır. Üretilen malzemelerin fizikselkarekterizasyonları için XRD, SEM, FTIR kullanılmış, manyetik özellikleri ise χ-T analizleri ileincelenmiştir. Pillerin performansını ve elektrokimyasal özelliklerini araştırmak için üretilen katotmalzemeleri CR2032 düğme pil haline getirilerek döngüsel voltametri (CV) ve kapasite ölçümleriyapılmıştır. $NaFePO_4$ katot malzemesinin XRD analizlerinde safsızlık fazları gözlenmemiştir. Pil halinegetirilmiş katot materyallerinin 1,5-4,0 V aralığında 100 döngülük kapasite değeri ölçülmüş, ilk deşarjkapasitesinin 26,29 mAh $g^{-1}$ olduğu ve 100. döngü sonunda kapasite değerinin ilk döngüye oranla%10.99 arttığı gözlemlenmiştir.

Production and Electrochemical Properties of Maricite $NaFePO_4$ Cathode Material

The use of energy generation and storage technologies has gained great importance inrecent years. Considering the developments in the field of sodium ion batteries (Na-ion), because oftheir 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 chemicalproperties with lithium and their production costs are lower. In this study, $NaFePO_4$ cathode materialwas produced by applying two-steps heat treatments with solid state reaction method. For the structuralcharacterization of produced materials XRD, SEM, FTIR were used and their magnetic properties wereinvestigated by χ-T analyzes. Cyclic voltammetry (CV) and capacity measurements were made toinvestigate the battery performance and electrochemical properties of cathode materials. There was notobserved impurity phases in XRD analysis in the structure of the $NaFePO_4$ cathode material. Thecapacity of cathode materials has been measured for 100 cycles in the 1.5-4.0 V range. It was observedthat 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 $100^{th}$ cycle.

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