U. Tocoglu

Sn/SnO2/Mwcnt composite anode and electrochemical impedance spectroscopy studies for Li-ion batteries

ABSTRACT Tin/tinoxide/multi-walled carbon nanotube (Sn/SnO2/MWCNT) core-shell structure nanocomposite anode is produced by thermal evaporation and subsequent plasma oxidation with using MWCNT buckypaper. Metallic tin is evaporated onto free-standing and flexible MWCNT buckypaper having controlled porosity and subsequent RF plasma oxidized in Ar:O2(1:1) gas mixture. X-ray diffraction and scanning electron microscopy are used to determine the structure and morphology of the obtained nanocomposite. The electrochemical characteristics of the nanocomposite anode are examined by using electrochemical impedance spectroscopy and galvanostatic charge–discharge experiments. Family of Nyquist plots during first discharge process are obtained and studied at different voltage values.

Li-O2 Piller için α-MnO2/Grafen/KNT Nanokompozit Elektrotlarının Üretimi ve Karakterizasyonu

Bu calismada Li-O 2 pilleri icin elektrot malzemesi α - MnO 2 /Grafen/KNT nanokompozitleri uretilmis ve karakterize edilmistir. Grafen Hummer metodu ile uretilmis ve tabakalar arasi bosluk yapici olarak karbon nano tup ilavesi yapilmistir. α - MnO 2 nano cubuklar sentezlenerek α - MnO 2 /Grafen/KNT nanokompozitleri vakum filtrasyon yontemi ile kagit halinde elektrot olarak uretilmistir. Uc farkli oranda ilave edilen α - MnO 2 nano cubuklari ile elektrotlarin yapisal karakterizasyonu FESEM, XRD kullanilarak ve elektrokimyasal karakterizasyonu da ECC-hava test hucreleri ile yapilmistir.