Lityum iyon pil negatif elektrotlar için kabuk/çekirdek yapılı karbon kaplanmış silisyum tozların sentezi, karakterizasyonu ve elektrokimyasal performansı
Silisyum nanotoz yüzeyleri, poliakrilonitril (PAN) polimerinin pirolizi ile amorf karbon ile kaplanmıştır. Amorf karbon kaplanmış siliyum tozların (Si-C) mikroyapı incelemeleri taramalı elektron mikroskobu (SEM) ile gerçekleştirilmiş ve geçirimli elektron mikroskobu (TEM) ile karbon kaplama kalınlığı tayin edilmiştir. Enerji dağılım X-ışınları spektroskopisi (EDS) ile Si-C tozlarının elementel analizleri yapılmıştır. Si-C tozlarının yapısal ve faz analizleri X-ışınları difraktometresi (XRD) ve Raman spektroskopisi ile incelenmiştir. Üretilen Si-C tozlar bakır akım toplayıcı üzerinde elektrot olarak hazırlanmış ve CR2016 düğme tipi hücreler kullanılarak 200 mA/g sabit akım yoğunluğunda elektrokimyasal testleri gerçekleştirilmiştir. Elektrokimyasal test sonuçlarına göre, karbon kaplama işlemi silisyum anotların hacim genleşmesinden kaynaklı problemleri azaltarak elektrokimyasal davranışlarını iyileştirmiş ve 30 çevrim sonunda yaklaşık 770 mAh/g deşarj kapasitesi göstermiştir.
Synthesis, characterization and electrochemical performance of core/shell structured carbon coated silicon powders for lithium ion battery negative electrodes
Surface of nano silicon powders were coated with amorphous carbon by pyrolysis of polyacronitrile (PAN) polymer. Microstructural characterization of amorphous carbon coated silicon powders (Si-C) were carried out using scanning electron microscopy (SEM) and thickness of carbon coating is defined by transmission electron microscopy (TEM). Elemental analyses of Si-C powders were performed using energy dispersive X-ray spectroscopy (EDS). Structural and phase characterization of Si-C composite powders were investigated using X-ray diffractometer (XRD) and Raman spectroscopy. Produced Si-C powders were prepared as an electrode on the copper current collector and electrochemical tests were carried out using CR2016 button cells at 200 mA/g constant current density. According to electrochemical test results, carbon coating process enhanced the electrochemical performance by reducing the problems stem from volume change and showed 770 mAh/g discharge capacity after 30 cycles.
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