本文關(guān)鍵詞：固態(tài)鋰空氣電池用新型聚合物基復(fù)合電解質(zhì)的研究　出處：《青島科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 聚合物電解質(zhì) 鋰空氣電池 聚氨酯 氧化還原電對

【摘要】：在石油、煤、天然氣等不可再生能源逐漸枯竭,環(huán)境問題日益嚴(yán)重的今天,發(fā)展新能源汽車產(chǎn)業(yè),緩解能源和環(huán)境壓力,是未來汽車產(chǎn)業(yè)長遠(yuǎn)發(fā)展的必然方向。鋰空氣電池因其巨大的理論能量密度(11140 Wh kg-1)在新一代電動汽車領(lǐng)域展示出重要的應(yīng)用前景。無論是從計(jì)算的理論能量密度還是從實(shí)際達(dá)到的能量密度上來看,鋰空氣電池都是遠(yuǎn)遠(yuǎn)超過傳統(tǒng)的鎳鎘電池、鉛酸電池、鋰離子電池等儲能器件,被認(rèn)為是未來電動汽車的首選高能動力電池之一。然而目前普遍應(yīng)用的液態(tài)有機(jī)電解液存在漏液、易燃、容量低、副產(chǎn)物多等劣勢,是阻礙鋰空氣電池發(fā)展的主要原因。近年來,聚合物電解質(zhì)因其高安全性,穩(wěn)定性和加工靈活性的特點(diǎn)有效解決上述問題。本論文通過設(shè)計(jì)并制備一系列聚合物基電解質(zhì)并將其應(yīng)用在鋰離子電池和鋰空氣電池中,主要的研究內(nèi)容如下:(1)通過溶液澆鑄法制備了聚氨酯/纖維素基凝膠聚合物電解質(zhì)(CGPE)。對其進(jìn)行一系列表征后,結(jié)果證明CGPE具有較高的室溫離子電導(dǎo)率(1.48×10-4 S cm~(-1)),寬電化學(xué)窗口(4.4 V vs Li+/Li),較高的鋰離子遷移數(shù)(t+=0.68)和良好的界面穩(wěn)定性。進(jìn)一步地,CGPE被應(yīng)用在鋰離子電池表現(xiàn)出了出色的倍率性能和室溫循環(huán)性能,200圈后依然有91%的容量保持率。CGPE被應(yīng)用在鋰空氣電池中,依然表現(xiàn)出了出色的循環(huán)可逆性和低充電過電勢,而且,CGPE基鋰空氣電池表現(xiàn)了非常優(yōu)異的循環(huán)穩(wěn)定性。(2)采用聚碳酸亞丙酯(PPC)、鋰化后的全氟磺酸膜(Li-Nafion),聚甲基丙烯酸甲酯(PMMA)和氧化還原電對(TEMPO)制備成 三明治‖結(jié)構(gòu)的準(zhǔn)固態(tài)聚合物電解質(zhì)(QSPE)。通過對其進(jìn)行結(jié)構(gòu)和電化學(xué)性能的表征,結(jié)果證明QSPE具有很高的選擇透過性,能有效抑制TEMPO的穿梭效應(yīng)。QSPE具有相對較高的室溫離子電導(dǎo)率和電化學(xué)窗口,保證了其具有較好的電化學(xué)性能。將其組裝成鋰空氣電池Li/QSPE/Super P,發(fā)現(xiàn)該體系下的鋰空氣電池具有很低的充電過電勢和優(yōu)異的倍率性能。更重要的是,其循環(huán)穩(wěn)定性非常出色,200圈后充電終止電壓小于4 V,放電平臺為2.6 V。通過對其副產(chǎn)物進(jìn)行定量分析,QSPE在充放電時(shí)產(chǎn)生了少量的甲酸鋰和乙酸鋰,說明在充放電循環(huán)中QSPE能有效減少副產(chǎn)物的生成。
[Abstract]:In the oil, coal, natural gas and other non-renewable energy gradually depleted, environmental problems are increasingly serious today, the development of new energy automotive industry, to ease the energy and environmental pressure. It is the inevitable direction of the future automobile industry. Lithium Air Battery is 11140Wh kg-1 because of its huge theoretical energy density. In the field of new generation electric vehicles, it shows important application prospects, whether from the theoretical energy density calculated or from the energy density achieved in practice. Lithium air batteries are far more than the traditional nickel cadmium batteries, lead acid batteries, lithium ion batteries and other energy storage devices. It is considered to be one of the preferred high-energy power batteries for electric vehicles in the future. However, the liquid organic electrolyte which is widely used at present has the disadvantages of leakage, flammability, low capacity, many by-products and so on. In recent years, polymer electrolytes have become more and more safe because of their high safety. The characteristics of stability and processing flexibility effectively solve the above problems. In this thesis, a series of polymer based electrolytes were designed and prepared and applied to lithium ion batteries and lithium air batteries. The main research contents are as follows: (1) Polyurethane / cellulosic gel polymer electrolyte (CGPEE) was prepared by solution casting method and characterized by a series of methods. The results show that CGPE has high room temperature ionic conductivity of 1.48 脳 10 ~ (-4) S cm ~ (-1) and wide electrochemical window of 4.4 V vs Li / Li). Higher lithium ion mobility and good interfacial stability. Further, CGPE has shown excellent performance in lithium-ion batteries both at room temperature and at room temperature. After 200 laps, 91% of the capacity retention. CGPE was used in lithium-air batteries, still showing excellent cyclic reversibility and low rechargeable overpotential. CGPE based lithium-air battery showed excellent cycle stability. 2) Poly (propylene carbonate) and Li-Nafion (perfluorinated sulfonic acid membrane) were used. Preparation of a sandwich structure quasi solid polymer electrolyte QSPE by polymethyl methacrylate (PMMA) and redox electric pair (TEMPO). The structure and electrochemical properties were characterized. The results show that QSPE has high selective permeability and can effectively inhibit the shuttle effect of TEMPO. QSPE has relatively high ionic conductivity and electrochemical window at room temperature. It has good electrochemical performance and is assembled into Li/QSPE/Super P of lithium air battery. It is found that the lithium-air battery in this system has very low overcharging potential and excellent rate performance. More importantly, the cycle stability is excellent and the charging termination voltage is less than 4 V after 200 cycles. The discharge platform is 2.6 V. A small amount of lithium formate and lithium acetate are produced by quantitative analysis of the by-products of QSPE during charging and discharging. The results show that QSPE can effectively reduce the formation of by-products in charge and discharge cycles.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ317;TM912

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相關(guān)期刊論文 前1條

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本文編號：1439390