Mg ve Al Çifte Takviyenin LiNi0.4Mn0.4Co0.2O2 Lityum-iyon Pil Katot Malzemesinin Yüksek Voltaj Çevrimine Etkisi
Nano boyutlu LiNi0.4Mn0.4Co0.2O2 lityum-iyon pil katot malzemeleri takviyesiz ve çifte Mg & Al takviyeli olarak Pechini yöntemi kullanılarak üretildi. Toz malzemeler X-ışını kırınımı, elektron mikroskobu ve elektrokimyasal tekniklerle incelendi. X-ışını analizleri 003/104 piklerin oranının takviyesiz malzemede 0.95’den takviyeli malzemede 1.27’ye çıktığını göstermiştir. Böylelikle çifte takviyenin Lityum/Nikel iyonların karışmasını azaltmada faydalı olduğu anlaşılmıştır. Çifte takviye takviyesiz malzemeye kıyasla ilk çevrim deşarj kapasitesinde azalmaya (140 vs. 128 mAh/g) ve empedansta artışa neden olmuş olsa da, yüksek voltajdaki pil testinde kapasite korunumunun artmasına yardımcı olduğu gözlenmiştir.
Effect of Mg and Al Dual Doping on High Voltage Cycling of LiNi0.4Mn0.4Co0.2O2 Lithium-ion Battery Cathode Material
Nano-sized LiNi0.4Mn0.4Co0.2O2 lithium-ion battery cathode materialswith and without dual Mg & Al doping were synthesized by Pechini method. Thepowdered materials were characterized using X-ray diffraction, scanning electronmicroscopy and electrochemical techniques. X-ray analyses showed that 003/104peaks intensity ratio increased from 0.95 for undoped material to 1.27 for dopedmaterial, thereby suggesting that dual doping was beneficial in terms reducingLi/Ni cation mixing. Although dual doping caused some reduction in initialdischarge capacity (140 vs. 128 mAh/g) and increase in charge transfer resistancerelative to the undoped material, it noticeably helped increase capacity retentionduring battery testing at high voltage.
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