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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/6541

    Title: 含短鏈段聚乙氧烯矽氧烷改質之具尿素官能基高分子電解質結構鑑定與動力學研究;A New Highly Conductive Organic-Inorganic Hybrid Electrolyte Based on Co-condensation of Di-ureasil and Ethylene Glycol-containing Alkoxysilane
    Authors: 陳前甫;Chian Fu
    Contributors: 化學研究所
    Keywords: 高分子電解質;ED2000;MPEOPS;polymer electrolyte;ED2000;MPEOPS
    Date: 2009-07-01
    Issue Date: 2009-09-22 10:21:30 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 摘要   本論文主要研究添加含短鏈段聚乙氧烯 (polyethylenoxy) 之矽氧烷2-[methoxy(polyethylenoxy)propyl]trimethoxysilane(MPEOPS) 及含 NCO 官能基之矽氧烷 3-(triethoxysilyl)propyl-isocyanate (ICPTES) 與高分子 jeffamine-ED series (ED2000、ED900、ED600) 反應生成有機無機固態高分子電解質,目的是希望在不降低機械強度的情況下增加整體 PEO 的含量,且在矽的區塊中仍有短鏈段 PEO 可以幫助鋰離子的傳遞。接著我們對添加新矽源所造成的物性變化,以及在不同 Lithium perchlorate (LiClO4) 濃度下對導電行為的影響進行研究。   在儀器部分主要使用X光繞射儀 (XRD)、微差掃描卡(DSC)、熱重分析儀 (TGA)、掃描式電子顯微鏡 (SEM)、紅外吸收光譜儀 (FTIR)、交流阻抗分析儀 (AC-Impedance) 以及固態核磁共振光譜儀 (Solid State NMR) 等儀器。   在結構鑑定及動力學探討部份,首先利用DSC測量高分子電解質之Tg及Tm點,接著使用XRD、TGA、FTIR、SEM等儀器對其熱穩定性及結構做鑑定,再來用交流阻抗分析儀 (AC-Impedance) 測其導電度,最後利用固態核磁共振光譜儀 (Solid State NMR) 做動力學方面的探討。   本高分子電解質在30 ?C 時的最佳導電度可達6.77 × 10-5 S/cm。 Abstract New organic-inorganic hybrid electrolytes based on di-ureasil backbone structures by reacting poly(propylene glycol)-block-poly(ethylene glycol)-block-poly(propylene glycol) bis(2-aminopropyl ether) (ED2000) with 3-(triethoxysilyl)propyl isocyanate (ICPTES), followed by co-condensation with methoxy(polyethylenoxy)propyl trimethoxysilane (MPEOP) in the presence of LiClO4 were prepared and characterized by a variety of techniques. The hybrid electrolytes showed good resistance to crystallization and excellent conductivity for use in lithium ion batteries, as determined by DSC and impedance measurements, respectively. The temperature dependence of the ionic conductivity exhibited a VTF (Vogel-Tamman-Fulcher)-like behavior for all the compositions studied and a maximum ionic conductivity value of 6.77×10-5 Scm-1, a relatively high value for solid polymer electrolytes, was achieved at 30 ?C for the hybrid electrolyte with a [O]/[Li] ratio of 24. The systematic study showed that a progressive decrease in the mobility of the polymer chains with increasing salt concentrations as confirmed from the glass transition temperature (Tg). A microscopic view of the dynamic behavior of the polymer chains (13C) and the ionic species (7Li) was provided by the 1H and 7Li line widths measured from 2D 1H–13C WISE (Wideline Separation) and variable temperature 7Li static NMR, respectively, to elucidate the influence of the mobility of the polymer chains and the charge carriers on the observed ionic conductivity. The present salt free hybrid electrolyte after plasticization with 1 M LiClO4 in EC/PC solution exhibited a swelling ratio of 275% and reached an ionic conductivity value up to 8.3×10-3 Scm-1 at 30 °C, which make it a good candidate for the further development of advanced rechargeable lithium-ion batteries.
    Appears in Collections:[化學研究所] 博碩士論文

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