本文選題：聚合物電解質(zhì) + 聚氰基丙烯酸乙酯��； 參考：《青島科技大學(xué)》2017年碩士論文

【摘要】：目前,人們對(duì)高安全性高能量密度鋰離子電池的需求越來(lái)越高,聚合物電解質(zhì)鋰電池與液態(tài)電解質(zhì)鋰離子電池相比具有更高的能量密度和更好的安全性能,因而受到研究人員的廣泛關(guān)注。以往的聚合物電解質(zhì)制備方法大多采用復(fù)雜的非原位法制備,這些方法需要消耗大量的有機(jī)溶劑用于鋰鹽的和聚合物的溶解。后續(xù)的膜制備和溶劑蒸發(fā)使這個(gè)方法不僅復(fù)雜而且污染環(huán)境,面臨消耗更多材料,成本昂貴。所以研究簡(jiǎn)單的原位合成方法來(lái)制備聚合物電解質(zhì)變得十分迫切。本論文采用原位陰離子聚合和原位陽(yáng)離子聚合兩種方式分別制備了高性能聚氰基丙烯酸乙酯聚合物電解質(zhì)和交聯(lián)聚乙二醇二縮水甘油醚全固態(tài)聚合物并研究了其電化學(xué)性能,具體內(nèi)容如下:(1)運(yùn)用金屬鋰引發(fā)陰離子原位聚合制備了耐5 V高電壓聚氰基丙烯酸乙酯基聚合物電解質(zhì)。此種方法充分利用了氰基丙烯酸乙酯結(jié)構(gòu)中含有強(qiáng)吸電子基團(tuán)氰基和酯基,活化能低的優(yōu)點(diǎn),采用金屬鋰作為陰離子引發(fā)劑來(lái)引發(fā)氰基丙烯酸乙酯進(jìn)行聚合。此種聚合方法簡(jiǎn)單高效,成功制備了新型聚合物電解質(zhì)。通過(guò)對(duì)聚氰基丙烯酸乙酯基聚合物電解質(zhì)進(jìn)行電化學(xué)性能研究可知,此電解質(zhì)的電導(dǎo)率可以達(dá)到2.7×10-3 S cm-1,電化學(xué)穩(wěn)定窗口為4.8 V vs.Li+/Li,并且電解質(zhì)可以滲透到正極材料內(nèi),產(chǎn)生良好的界面穩(wěn)定性,并且,聚氰基丙烯酸乙酯電解質(zhì)在磷酸鐵鋰和高電壓鎳錳酸鋰電池中具有良好的倍率性能,循環(huán)穩(wěn)定性。因此,聚氰基丙烯酸乙酯反應(yīng)條件溫和,機(jī)械強(qiáng)度好,是一種非常有潛力應(yīng)用于耐5 V高電壓柔性鋰電池。(2)利用鋰鹽的路易斯酸性引發(fā)陽(yáng)離子原位聚合,制備了高性能聚乙二醇二縮水甘油醚全固態(tài)聚合物電解質(zhì)。將液態(tài)聚乙二醇二縮水甘油醚作為聚合物前驅(qū)體,雙氟草酸硼酸鋰作為引發(fā)劑,雙三氟甲基磺酰亞胺鋰作為鋰鹽,通過(guò)原位聚合的方法成功制備了全固態(tài)聚合物電解質(zhì)。相對(duì)于傳統(tǒng)的制備方法,此固態(tài)聚合物電解質(zhì)體系中沒(méi)有添加額外的引發(fā)劑或催化劑,只含有前驅(qū)體和鋰鹽,體系內(nèi)成分簡(jiǎn)單。通過(guò)低溫加熱的原位制備方法不僅制備方法可靠簡(jiǎn)單,且其相對(duì)于其他的聚合方法也能夠抑制副反應(yīng)的發(fā)生。而且此種化學(xué)交聯(lián)的方法制備的交聯(lián)PEO基聚合物電解質(zhì)具有較低的玻璃化轉(zhuǎn)變溫度,使電解質(zhì)具有較高的室溫離子電導(dǎo)率(8.9×10-5 S cm-1)。此外,該原位交聯(lián)PEO基聚合物電解質(zhì)在磷酸鐵鋰半電池中具有良好的倍率性能,循環(huán)穩(wěn)定性,并能夠抑制鋰枝晶的產(chǎn)生。因此,通過(guò)鋰鹽自催化法制備交聯(lián)PEO聚合物電解質(zhì)是一種非常有潛力的電解質(zhì)制備方法。
[Abstract]:At present, the demand for high safety and high energy density lithium ion batteries is getting higher and higher. The polymer electrolyte lithium battery has a higher energy density and better safety performance compared with the liquid electrolyte lithium ion battery. Therefore, the researchers pay much attention to the high energy density and the lithium ion battery. In situ preparation, these methods require a large amount of organic solvents to be used for lithium salts and the dissolving of polymers. Subsequent membrane preparation and solvent evaporation make this method not only complex but also pollute the environment, so it is expensive to consume more materials, so it is very pressing to study a simple in situ synthesis method to prepare polymer electrolytes. In this paper, high performance polyethyl cyanoacrylate polymer electrolyte and crosslinked polyethylene glycol two glycidyl ether all solid state polymer were prepared by in situ anionic polymerization and in situ cationic polymerization, and their electrochemical properties were studied. The specific contents are as follows: (1) the anionic in-situ polymerization was initiated by lithium metal (1). The 5 V high voltage Polycyanoacrylate based polymer electrolyte is prepared. This method makes full use of the advantages of the cyanoacrylate and ester group with strong absorption group in the structure of ethyl cyanoacrylate, and the activation energy is low. The lithium cyanoacrylate is polymerized by metal lithium as an anionic initiator. This polymerization is simple and efficient. A new polymer electrolyte was successfully prepared. By studying the electrochemical performance of the Polycyanoacrylate based polymer electrolyte, the conductivity of the electrolyte can reach 2.7 x 10-3 S cm-1, the electrochemical stability window is 4.8 V vs.Li+/Li, and the electrolyte can penetrate into the cathode material and produce good interfacial stability. Moreover, the Polycyanoacrylate electrolyte has good multiplier performance and cycle stability in lithium iron phosphate and high voltage lithium manganate batteries. Therefore, the reaction conditions of Polycyanoacrylate are mild and the mechanical strength is good. It is a very potential application to the 5 V high voltage flexible lithium battery. (2) the Lewis acid introduction of lithium salt. A high performance polyethylene glycol two glycidyl ether all solid state polymer electrolyte was prepared by cationic in situ polymerization. The liquid polyethylene glycol two glycidyl ether was used as polymer precursor, difluorooxalic acid lithium borate as an initiator, and difluoromethyl sulfonimide lithium as lithium salt. The solid state polymerization was successfully prepared by in-situ polymerization. Compared with traditional preparation methods, there is no additional initiator or catalyst in this solid-state polymer electrolyte system, which contains only precursors and lithium salts, and the internal composition of the system is simple. The preparation method by in situ preparation by low temperature heating is not only reliable and simple, but also can be inhibited relative to other polymerization methods. In addition, the crosslinked PEO based polymer electrolyte prepared by this chemical crosslinking method has a lower glass transition temperature and a high ionic conductivity (8.9 * 10-5 S cm-1) at room temperature. In addition, the in-situ crosslinked PEO based polymer electrolyte has good multiplier performance in the iron phosphate half battery. Therefore, the preparation of the crosslinked PEO polymer electrolyte by the lithium salt autocatalytic method is a very potential method for the preparation of electrolyte.

【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TQ317;TM912

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 張鵬;李琳琳;何丹農(nóng);吳宇平;清水真;;鋰離子電池凝膠聚合物電解質(zhì)研究進(jìn)展[J];高分子學(xué)報(bào);2011年02期

2 高宏權(quán);張治安;賴(lài)延清;李R，

本文編號(hào)：1880333