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    题名: 具不同特性單體之混摻型 有機無機固(膠)態高分子電解質 結構鑑定與動力學研究
    作者: 何嗣元;Ho,Sze-Yuan
    贡献者: 化學學系
    关键词: 鋰離子電池;固態高分子電解質;lithium ion battery;solid polymer electrolyte
    日期: 2014-07-24
    上传时间: 2014-10-15 14:37:18 (UTC+8)
    出版者: 國立中央大學
    摘要: 本論文分為兩大部分,第一部分是合成出兩種不同特性之高分子單體(MG、PEG122),依不同重量比混摻,並改變氧鋰比,合成出一新型混摻型有機無機固態高分子電解質。接著探討鋰鹽濃度對於高分子電解質的性質影響及鋰離子與高分子鏈段的作用情形:利用熱重分析儀 (TGA) 觀察其熱穩定性;以微差掃描熱卡計 (DSC) 研究高分子鏈段結晶情形;以傅立葉紅外線吸收光譜儀 (FTIR) 對其結構作鑑定並分析鋰鹽解離程度;以交流阻抗分析儀 (AC Impedance) 測量離子導電度、電化學穩定性及鋰離子遷移係數;以掃描式電子顯微鏡 (SEM) 分析其表面形態;以固態核磁共振光譜儀 (SSNMR) 之13C CP MAS進行結構鑑定,並利用許多NMR技術如1H-13C 2D WISE、7Li NMR譜寬量測等方法了解鋰離子與高分子鏈段運動性之間的動力學分析研究。藉由分析結果發現其導電度隨高分子鏈段運動性增加而上升,室溫下最佳導電度可達1.15 × 10-4 Scm-1。
    第二部分則是將第一部分所合成之高分子單體MG、PEG122與交聯劑PVdF-HFP依不同比例混合,並吸附市售有機液態電解液 (1 M LiPF6 EC/DEC, 1:1 v/v),製備成膠態高分子電解質,期望能夠提升離子導電度並應用於鋰離子電池當中。接著針對其電解液吸附情形作澎潤比測試;以交流阻抗分析儀 (AC Impedance) 測量離子導電度與電化學穩定性,得知此膠態高分子電解質於室溫下最佳導電度可達到6.95 × 10-3 S cm-1,且可承受到約4.1 V之氧化分解電壓;最後進一步組裝成硬幣型 2032 電池,對其電池充放電性能作探討。
    ;A new organic-inorganic hybrid electrolyte was synthesized by bridging two different organic-inorganic groups via silane condensation. Two precursors were formed by reacting (i) tri-block co-polymer poly(propylene glycol)-block -poly(ethylene glycol)-block-poly(propylene glycol) bis(2-aminopropyl ether), poly(ethylene glycol diglycidyl ether and (3-glycidoxypropyl)-trimethoxysilane, and (ii) oligo(oxyalkylene)-amines (M-2070) with (3-glycidyloxypropyl)-trimethoxysilane. Both the precursors were coupled via silane condensation. Final hybrid electrolytes were obtained by varying the weight percentages of both the precursors and [O]/[Li] ratios, and characterized by different techniques.
    The structure and performance of the polymer electrolytes for lithium ion batteries use, including thermal stability, ionic conductivity, salt dissolvability, surface morphology, electrochemical stability, were studied by thermogravi-metric analyzer (TGA), AC impedance, Fourior transform infaraed spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron spectroscopy (SEM), 13C cross-polarization magic-angle spinning (CPMAS). The Vogel-Tamman-Fulcher (VTF)-like conductivity behavior is observed in the present solid polymer electrolyte (SPE) with a maximum ionic conductivity is 1.15×10-4 Scm-1 at 30°C. Multinuclear NMR techniques are used to provide a microscopic view for the specific interaction between the polymer chains and Li+ cations and their dynamic behaviors. The results of 2D 1H-13C wide-line separation (WISE) and 7Li static line NMR width measurements reveal that the mobility of the 7Li cations are strongly related to a dynamic environment created by the polymer chains motion in the amorphous phase.
    Then the swelling ratio and the ionic conductivity of the electrolyte membranes are measured with comercial liquid electrolyte solutions, the gel polymer electrolytes (GPEs) represents the highest ionic conductivity as 6.95 × 10-3 Scm-1 at 30°C and with sufficient electrochemical stability up to 4.1 V. Hence, it can be concluded that this new hybrid polymer system is suitable for use as a GPE in rechargeable lithium batteries.
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