Development and characterization of tin based anode materials for Li-ion batteries

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Metalurji ve Malzeme Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2018

Öğrenci: EMRE YILMAZ

Danışman: MEHMET KADRİ AYDINOL

Özet:

Li-ion batteries are the most popular type of portable secondary batteries. They generate electrons at anode electrode during discharging process by releasing $Li^+$ ions from anode, in which graphite is used as Li reservoir. Recently, $SiO_2$ and Tin (IV) Oxide materials are investigated as anode materials by researchers, due to their very high theoretical capacity. There are two problems, however, limiting their use which are pulverization and irreversible reaction problems. These problems are, also, the causes of the capacity loss during charge-discharge cycles. To solve these problems, tools of nanotechnology are used to obtain different nanostructures. Doping with elements is another way to improve properties. In this study, tin based anode materials was developed for lithium ion batteries. For the production of materials, hydrothermal method was used. The effect of hydrothermal processing parameters and alloying elements such as La, W, Y and Zr were investigated. Produced materials were characterized by SEM, TEM also XRD for structural analysis and EDS were used for chemical analysis. Samples will be assembled in coin cells and galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance spectoscopy techniques were applied for their electrochemical characterization.