DC 欄位 |
值 |
語言 |
DC.contributor | 化學學系 | zh_TW |
DC.creator | 邱郁雯 | zh_TW |
DC.creator | Yu-Wen Chiu | en_US |
dc.date.accessioned | 2016-7-13T07:39:07Z | |
dc.date.available | 2016-7-13T07:39:07Z | |
dc.date.issued | 2016 | |
dc.identifier.uri | http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=103223002 | |
dc.contributor.department | 化學學系 | zh_TW |
DC.description | 國立中央大學 | zh_TW |
DC.description | National Central University | en_US |
dc.description.abstract | 本論文使用高溫高壓水熱合成法,合成出 3 個的鋰鈦磷酸鹽化合物 : LiTi2(PO4)3 (A1)、Li1+xTi2-xFex(PO4)3 (x=0.8) (A2)、 Li1+xTi2-xFex(PO4)3 (A3),藉由單晶 X 光繞射方法鑑定出化合物的晶體結構,並使用粉末 X 光繞射確定樣品純度以供後續分析,再以 X 光能量散佈分析、感應耦合電漿原子發射光譜儀、穆斯堡爾光譜儀等儀器進行定量及鐵離子周圍環境之分析。
A1 和 A3 為 NASICON 結構,它們皆為三方晶系,空間群為 R-3c,結構中的 2 個 MO6 與 3 個 PO4 會以共角的方式式連接成一個燈籠狀結構單元,其燈籠狀結構單元又以平形的方向互相作排列,鋰離子座落於八員環中。
A2 為 anti-NASICON 結構,其為正交晶系,空間群為 Pbcn. A2 也是由燈籠狀結構單元所組成,其燈籠狀結構單元的組成與 A1 (A3) 相同,不同的是其燈籠狀結構單元是以反平形的方向作排列,而鋰離子座落於六員環中。
並且使用溶膠-凝膠法合成出鋰鐵鈦磷酸鹽化合物 : Li1+xTi2-xFex(PO4)3 (x=0.5) (A4, LFTP),藉由粉末 X 光繞射鑑定其為NASICON結構。A4 可做為穩定的鋰電池之電解質材料,其離子導電度可達到 1 x 10-3 S· cm-1,將 A4 導入陰極材料,其放電電容量可達到 14.6 mAh。 | zh_TW |
dc.description.abstract | Three lithium titanium phosphates, LiTi2(PO4)3 (A1), Li1+xTi2-xFex(PO4)3 (x=0.8) (A2), Li1+xTi2-xFex(PO4)3 (A3), were synthesized by the high-temperature, high-pressure hydrothermal method, and structurally characterized by powder and single X-ray diffraction. These compounds were further characterized by XRF, ICP-OES and Mössbauer spectroscopy.
A1 and A3 adopt the NASICON structure with the trigonal space group R-3c. They both consist of lantern structure units which are composed of two MO6 octahedra and three PO4 tetrahedra by corner-sharing, and the units are connected in aparallel way. The lithium cations are located in the eight-membered rings.
A2 adopts the anti-NASICON structure with the orthorhombic space group Pbcn, and consist of the same lantern units. But the lantern units are connected in an anti-parallel way and lithium cations are located in the six-membered rings which have different environment from A1(A3).
A lithium iron titanium phosphate Li1+xTi2-xFex(PO4)3 (x=0.5) (A4, LFTP) with the NASICON structure has been synthesized by sol-gel method and characterized by powder X-ray diffraction. It is found that A4 displays good stability as electrolyte material for lithium battery. The ionic conductivity is
1 x 10-3 S· cm-1 and discharge capacity is 14.6 mAh. | en_US |
DC.subject | 水熱合成法 | zh_TW |
DC.subject | 溶膠凝膠法 | zh_TW |
DC.subject | 鋰鐵鈦磷酸鹽 | zh_TW |
DC.subject | 電化學測量 | zh_TW |
DC.title | 鋰鐵鈦磷酸鹽之晶體結構與離子導電度性質研究 | zh_TW |
dc.language.iso | zh-TW | zh-TW |
DC.title | Syntheses, Crystal Structures and Ionic Conductivity Properties of Lithium Iron Titanium Phosphates | en_US |
DC.type | 博碩士論文 | zh_TW |
DC.type | thesis | en_US |
DC.publisher | National Central University | en_US |