本文選題：光學(xué)活性 + 螺旋聚氨酯��； 參考：《南京理工大學(xué)》2017年碩士論文

【摘要】：微電子技術(shù)和能源產(chǎn)業(yè)的迅速發(fā)展,對(duì)儲(chǔ)能鋰電池的性能要求越來越高。近年,為設(shè)計(jì)制造出更高性能的鋰離子電池,越來越多的科研人員將研究重點(diǎn)轉(zhuǎn)移到對(duì)鋰電池用聚合物固體電解質(zhì)的研究上。與傳統(tǒng)液體電解質(zhì)相比,聚合物固體電解質(zhì)具有不易漏液、易加工、熱穩(wěn)定性好、能量密度高等特點(diǎn)。將新型光學(xué)活性螺旋結(jié)構(gòu)的聚氨酯材料引入到電解質(zhì)中,對(duì)于電解質(zhì)基體材料的擴(kuò)充,新材料的開發(fā)設(shè)計(jì)具有重要意義。本論文主要在以下幾方面做了研究:1.采用不同路線合成出L-酪氨酸芐酯聚氨酯和不同對(duì)映體過量百分?jǐn)?shù)的戊酯聚氨酯,利用紅外(IR),核磁(NMR)分析確定聚合物結(jié)構(gòu),通過紅外光譜研究了不同對(duì)映體過量百分?jǐn)?shù)戊酯聚氨酯分子中氫鍵化程度,利用XRD分析了聚合物結(jié)晶性,并結(jié)合紫外光譜(UV-Vis)與圓二色譜(CD)證明L-酪氨酸戊酯聚氨酯具有規(guī)整有序的螺旋二級(jí)結(jié)構(gòu),而外消旋聚氨酯不具有光學(xué)活性,且分子鏈成無規(guī)卷曲狀態(tài);2.利用交流阻抗技術(shù)(EIS)研究了不同鋰鹽種類,不同鋰鹽含量以及聚氨酯側(cè)鏈結(jié)構(gòu)對(duì)聚合物固體電解質(zhì)離子電導(dǎo)率的影響,通過對(duì)不同對(duì)映體過量百分?jǐn)?shù)聚氨酯基體材料光學(xué)活性,二級(jí)結(jié)構(gòu)以及對(duì)應(yīng)的聚氨酯基固體電解質(zhì)交流阻抗譜進(jìn)行研究,證明規(guī)整有序的螺旋二級(jí)結(jié)構(gòu)能夠有效的提高電解質(zhì)材料的離子電導(dǎo)率。3.對(duì)光學(xué)活性螺旋聚氨酯基固體電解質(zhì)進(jìn)行改性研究,通過與聚甲基丙烯酸鋰共混制備的電解質(zhì)薄膜,具有更高的離子電導(dǎo)率5.78×10~(-5)S/cm,熱重分析表明:實(shí)驗(yàn)制備的固體電解質(zhì)膜在200℃才會(huì)出現(xiàn)分解,具有良好的熱穩(wěn)定性。同時(shí)通過簡(jiǎn)單設(shè)計(jì)合成出單離子型螺旋聚氨酯固體電解質(zhì),并通過和離子液體共混,使離子電導(dǎo)率得到提高,室溫達(dá)到6.12×10~(-6)S/cm。
[Abstract]:With the rapid development of microelectronics and energy industry, the performance of energy storage lithium battery is becoming more and more important. In recent years, in order to design and manufacture lithium ion batteries with higher performance, more and more researchers focus on polymer solid electrolytes for lithium batteries. Compared with conventional liquid electrolytes, polymer solid electrolytes are characterized by easy leakage, easy processing, good thermal stability and high energy density. The introduction of novel optical active helical polyurethane materials into electrolytes is of great significance for the expansion of electrolyte matrix materials and the development and design of new materials. This thesis has done the research in the following several aspects: 1. L-tyrosine benzyl ester polyurethane and amyl ester polyurethane with different enantiomeric excess percentage were synthesized by different routes. The structure of the polymer was determined by IR and NMR analysis. The degree of hydrogen bonding in polyurethanes with different enantiomers was studied by IR, and the crystallinity of the polymers was analyzed by XRD. Combined with UV-Vis and circular dichroism (CD), it was proved that L- tyrosine amyl ester polyurethane had a regular and ordered helical secondary structure, whereas racemic polyurethane had no optical activity, and its molecular chain was in a random coil state. The effects of different kinds of lithium salts, different lithium content and side chain structure of polyurethane on ionic conductivity of polymer solid electrolyte were studied by using alternating current impedance spectroscopy (EIS). The optical activity of polyurethane matrix materials with different enantiomer excess percentage was studied. The secondary structure and the corresponding impedance spectroscopy of polyurethane based solid electrolyte show that the ordered spiral secondary structure can effectively improve the ionic conductivity of electrolyte. The modification of optical active helical polyurethane based solid electrolyte was studied. The electrolyte film was prepared by blending with lithium polymethacrylate. The ionic conductivity is 5.78 脳 10 ~ (-5) S / cm. The thermogravimetric analysis shows that the solid electrolyte membrane prepared by the experiment only decomposes at 200 鈩，

本文編號(hào)：2106803