聚丙烯酸酯类聚合物基凝胶聚合物电解质的研究
发布时间：2018-11-18 20:52
【摘要】：凝胶聚合物锂离子电池是在液态锂离子电池的基础上发展起来的新一代可充电锂离子电池,它不仅具有液态锂离子电池的高电压、高能量密度、长循环寿命等特点,而且改善了液态锂离子电池可能出现的漏液、爆炸等问题,电池的外形设计组装也灵活方便,广泛应用于电动汽车、移动通讯等领域。因此,对凝胶聚合物电解质膜的需求也日益增加,凝胶聚合物电解质膜的研究也得到了众多研究者的关注。 本文主要研究了基于聚丙烯酸酯类基体的两类凝胶聚合物电解质(GPE)：首先以甲基丙烯酸甲酯(MMA)和马来酸酐(MAh)为单体合成共聚物P(MMA-MAh),然后在此共聚物基础上引入聚乙二醇1500(PEG33),合成得到新型交联聚合物P(MMA-MAh)-PEG33,并分别以两种聚合物为基体,碳酸丙烯酯(PC)为增塑剂,LiClO4为锂盐制备凝胶聚合物电解质。采用傅里叶红外光谱(FTIR)、X射线衍射法(XRD)、差示扫描量热法(DSC)、热失重分析(TGA)对合成的两种聚合物进行表征,采用交流阻抗法对制备的两种凝胶聚合物电解质体系的导锂离子性能作了研究,并且分析了不同温度和配比对其离子电导率的影响。 结果表明,成功合成了非晶无定形结构的共聚物P(MMA-MAh)和交联聚合物P(MMA-MAh)-PEG33。交联聚合物的玻璃化转变温度Tg为124℃,比共聚物的Tg(133℃)要低,前者的热分解温度为358℃,比后者的热分解温度(349℃)要高。两种聚合物基GPE的成膜性较好,结构比较稳定,当添加的聚合物基体与液体电解液的质量比为50：50时,GPE的失重率较低,保液性能较好,交联聚合物P(MMA-MAh)-PEG33基GPE的最小失重率为32.23%,共聚物P(MMA-MAh)基GPE的最小失重率为29.23%,两者的保液性能相差不大。两种聚合物基GPE体系的离子电导率均随温度的升高而增大,随聚合物含量的增加而减小,且在研究温度范围(0-40℃)内锂离子迁移符合Arrhenius方程。当交联聚合物质量含量为50%时,其凝胶聚合物电解质在室温下的离子电导率达8.66×10-5S/cm,比共聚物基凝胶聚合物电解质在相同情况下的室温离子电导率(4.61×10-5S/cm)要高。另外,交联聚合物体系的活化能值均小于共聚物体系的活化能值,这是因为交联结构更有利于锂离子的迁移,赋予其拥有相对于共聚物更优异的性能,使其更加满足锂离子电池的使用需要。
[Abstract]:Gel polymer lithium ion battery is a new generation of rechargeable lithium ion battery based on liquid lithium ion battery. It not only has the characteristics of high voltage, high energy density and long cycle life of liquid lithium ion battery. It also improves the problems of liquid lithium-ion battery such as leakage, explosion and so on. The configuration design and assembly of the battery is also flexible and convenient. It is widely used in electric vehicle, mobile communication and other fields. Therefore, the demand for gel polymer electrolyte membrane is increasing day by day, and the research of gel polymer electrolyte membrane has been paid attention by many researchers. In this paper, two kinds of gel polymer electrolyte (GPE): based on polyacrylate matrix were studied. Firstly, the copolymers P (MMA-MAh) were synthesized with methyl methacrylate (MMA) and maleic anhydride (MAh) as monomers. A new crosslinked polymer P (MMA-MAh)-PEG33, was synthesized by introducing polyethylene glycol 1500 (PEG33) on the basis of the copolymer. Two kinds of polymers were used as matrix and propylene carbonate (PC) as plasticizer, respectively. LiClO4 was used as lithium salt to prepare gel polymer electrolyte. Two kinds of synthesized polymers were characterized by (XRD), differential scanning calorimetry (DSC),) and thermogravimetric analysis (TGA) by Fourier transform infrared (FTIR) (FTIR), X ray diffraction. The lithium ion conductivity of two kinds of gel polymer electrolytes was studied by AC impedance method, and the effects of different temperature and ratio on ionic conductivity were analyzed. The results show that the amorphous copolymer P (MMA-MAh) and the crosslinked polymer P (MMA-MAh)-PEG33. have been successfully synthesized. The glass transition temperature (Tg) of the crosslinked polymer is 124 鈩，
本文编号：2341189
[Abstract]:Gel polymer lithium ion battery is a new generation of rechargeable lithium ion battery based on liquid lithium ion battery. It not only has the characteristics of high voltage, high energy density and long cycle life of liquid lithium ion battery. It also improves the problems of liquid lithium-ion battery such as leakage, explosion and so on. The configuration design and assembly of the battery is also flexible and convenient. It is widely used in electric vehicle, mobile communication and other fields. Therefore, the demand for gel polymer electrolyte membrane is increasing day by day, and the research of gel polymer electrolyte membrane has been paid attention by many researchers. In this paper, two kinds of gel polymer electrolyte (GPE): based on polyacrylate matrix were studied. Firstly, the copolymers P (MMA-MAh) were synthesized with methyl methacrylate (MMA) and maleic anhydride (MAh) as monomers. A new crosslinked polymer P (MMA-MAh)-PEG33, was synthesized by introducing polyethylene glycol 1500 (PEG33) on the basis of the copolymer. Two kinds of polymers were used as matrix and propylene carbonate (PC) as plasticizer, respectively. LiClO4 was used as lithium salt to prepare gel polymer electrolyte. Two kinds of synthesized polymers were characterized by (XRD), differential scanning calorimetry (DSC),) and thermogravimetric analysis (TGA) by Fourier transform infrared (FTIR) (FTIR), X ray diffraction. The lithium ion conductivity of two kinds of gel polymer electrolytes was studied by AC impedance method, and the effects of different temperature and ratio on ionic conductivity were analyzed. The results show that the amorphous copolymer P (MMA-MAh) and the crosslinked polymer P (MMA-MAh)-PEG33. have been successfully synthesized. The glass transition temperature (Tg) of the crosslinked polymer is 124 鈩，
本文编号：2341189
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