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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65328


    Title: 以水熱法製備水系鈉離子電池NaTi2(PO4)3負極材料;The sodium ion battery negative material NaTi2(PO4)3 prepared by hydrothermal method to apply in aqueous systems
    Authors: 藍瑋宣;Lan,Wei-hsuan
    Contributors: 材料科學與工程研究所
    Keywords: 水熱法;磷酸鈉鈦;負極;鈉離子電池;鈉超離子導體;Hydrothermal;NaTi2(PO4)3;anode;sodium ion battery;NASICON
    Date: 2014-08-11
    Issue Date: 2014-10-15 15:06:24 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本研究以水熱法合成鈉超離子導體(NASICON)-磷酸鈉鈦,藉改變合成參數,如反應體積、反應時間、前驅物濃度及界面活性劑濃度,可獲得奈米顆粒;並添加不同比重之碳源進行碳包覆,增進其導電性,以利後續電池性能量測。經X光繞射儀(XRD)分析得知: 水熱法合成可獲得結晶性良好之磷酸鈉鈦;掃描式電子顯微鏡(SEM)觀察: 磷酸鈉鈦粉末之平均粒徑範圍約為100 ~ 500 nm。經碳包覆後,由拉曼(Ramam)光譜分析偵測出碳特徵訊號、熱重分析(TGA)得知包覆後碳含量依碳源添加量不同約3 wt%、6wt%,穿透式電子顯微鏡(TEM)觀察可確認碳包覆及其形貌。先後以三極式電化學系統量測循環伏安曲線、二級式鈕扣電池量測鈉離子電池之性能。最佳合成參數及碳包覆含量之樣品其於不同充放電速率(0.2、0.5、1、2、5C)下展現出優異電容量(121、114、110、102、67mAh/g)、庫倫效率除首圈外,皆高達99%以上、放電電容量維持率亦維持在95%以上;經200次充放電循環測試後,仍保持約82%之放電電容量,且由電化學交流阻抗分析表明,阻值無明顯上升,顯示以水熱法合成之鈉超離子導體(NASICON)-磷酸鈉鈦在作為水系鈉離子電池負極材料極具潛力。;Nano particle of sodium titanium phosphate belonging to sodium super-ionic conductor (NASICON)-type were successfully prepared by hydrothermal method under different synthetic parameters. With appropriate carbon-coating can improve material conductivity thus possibly suitable for making negative electrodes of sodium-ion batteries. From X-ray diffraction (XRD), which results revealed well crystalline structure of NaTi2(PO4)3 by hydrothermal method. Examination by field-emission scanning electron microscope (FE-SEM), the powders indicated their particle size in the range from 100 nm to 500 nm depending upon the experimental conditions. After coating by carbon, Raman spectroscopy demonstrated the D-band and G-band of carbon. The result of thermal gravimetric analysis (TGA) displayed that the carbon content was about 3wt%, 6wt% depending upon content of carbon source. The presence of carbon coating could be directly observed through by transmission electron microscope. Standard three-electrode cell was employed to conduct the cyclic voltammetry; two-electrode system via a coin cell was carried out for the test of battery performance, respectively. The optimal results revealed that C-coated nanoparticle NaTi2(PO4)3/C exhibited excellent electrochemical performance with high specific capacities (121, 114, 110, 102, 67mAh/g), high coulomb efficiency (99%) except first cycle and well discharge capacity retention (95%) at different charge/discharge rate (0.2, 0.5, 1, 2, 5C). A delivery of ~82% discharge capacity retention after 200 cycles and no obvious fading for impedance indicated that sodium titanium phosphate nano powders prepared in this work provided a potential material to prepare the anode used in aqueous sodium ion battery.
    Appears in Collections:[材料科學與工程研究所 ] 博碩士論文

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