| DC 欄位 |
值 |
語言 |
| DC.contributor | 材料科學與工程研究所 | zh_TW |
| DC.creator | 藍瑋宣 | zh_TW |
| DC.creator | Wei-hsuan Lan | en_US |
| dc.date.accessioned | 2014-8-11T07:39:07Z | |
| dc.date.available | 2014-8-11T07:39:07Z | |
| dc.date.issued | 2014 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=101329010 | |
| dc.contributor.department | 材料科學與工程研究所 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.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。 | zh_TW |
| dc.description.abstract | 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. | en_US |
| DC.subject | 水熱法 | zh_TW |
| DC.subject | 磷酸鈉鈦 | zh_TW |
| DC.subject | 負極 | zh_TW |
| DC.subject | 鈉離子電池 | zh_TW |
| DC.subject | 鈉超離子導體 | zh_TW |
| DC.subject | Hydrothermal | en_US |
| DC.subject | NaTi2(PO4)3 | en_US |
| DC.subject | anode | en_US |
| DC.subject | sodium ion battery | en_US |
| DC.subject | NASICON | en_US |
| DC.title | 以水熱法製備水系鈉離子電池NaTi2(PO4)3負極材料 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | The sodium ion battery negative material NaTi2(PO4)3 prepared by hydrothermal method to apply in aqueous systems | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |