Preparation method of PVA/Li<+>/PEO interpenetrating network structure composite gel electrolyte
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A composite gel and network structure technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of flammability, easy leakage of liquid electrolytes, and toxicity, and achieve high polarity, easy crystallization, good flexibility
Active Publication Date: 2020-09-15
NORTHWEST UNIV(CN)
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[0005] The purpose of the present invention is to provide a gel electrolyte that replaces the traditional liquid electrolyte, so as to solve the problems that the liquid electrolyte is easy to leak, toxic, flammable, and needs a diaphragm
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Embodiment 1
[0026] 称取2g聚乙烯醇(PVA)溶于去20ml离子水中并于95℃加热搅拌至完全溶解,获得稳定的PVA溶液。将上述PVA溶液浇筑在模具中,-20℃冷冻24h,解冻5h,重复4次。制备的聚乙烯醇(PVA)膜,将PVA膜浸入在30ml,9wt%LiCl溶液中浸泡10h,室温干燥,静置时间为3h;再在乙醇钠浓度为8wt%的乙醇钠-乙醇溶液中浸泡8h,室温干燥,静置时间为3h,得到干燥的凝胶。将相对环氧乙烷摩尔比分别为0.1mol%、0.1mol%的N,N-亚甲基双丙烯酰胺(MBAA)、过硫酸铵(APS)与环氧乙烷(EO)溶液混合,配制环氧乙烷混合溶液。将上述干燥的凝胶浸入环氧乙烷混合溶液中浸泡24h,室温干燥,静置时间为3~5h,制得PVA / Li + / PEO互穿网状结构复合凝胶电解质。PVA / Li + / PEO互穿网状结构复合凝胶电解质的离子电导率为0.5×10 -4 S / cm,拉伸强度为1.395MPa,断裂伸长率为241.53%。
Embodiment 2
[0028] 称取2g聚乙烯醇(PVA)溶于去10ml离子水中并于90℃加热搅拌至完全溶解,获得稳定的PVA溶液。将上述PVA溶液浇筑在模具中,-25℃冷冻24h,解冻5h,重复4次。制备的聚乙烯醇(PVA)膜,将PVA膜浸入在30ml,9wt%LiPF 6 溶液中浸泡10h,室温干燥,静置时间为4h;再在乙醇钠浓度为8wt%的乙醇钠-乙醇溶液中浸泡8h,室温干燥,静置时间为4h,得到干燥的凝胶。将相对环氧乙烷摩尔比分别为0.1mol%、0.1mol%的N,N-亚甲基双丙烯酰胺(MBAA)、过硫酸铵(APS)与环氧乙烷(EO)溶液混合,配制环氧乙烷混合溶液。将上述干燥的凝胶浸入环氧乙烷混合溶液中浸泡24h,室温干燥,静置时间为4h,制得PVA / Li + / PEO互穿网状结构复合凝胶电解质。PVA / Li + / PEO互穿网状结构复合凝胶电解质的离子电导率为0.9×10 -3 S / cm,拉伸强度为3.105MPa,断裂伸长率为400.53%。
Embodiment 3
[0030] 称取2g聚乙烯醇(PVA)溶于去8ml离子水中并于93℃加热搅拌至完全溶解,获得稳定的PVA溶液。将上述PVA溶液浇筑在模具中,-18℃冷冻24h,解冻5h,重复4次。制备的聚乙烯醇(PVA)膜,将PVA膜浸入在30ml,9wt%LiClO 4 溶液中浸泡10h,室温干燥,静置时间为5h;将干燥的凝胶在乙醇钠浓度为8wt%的乙醇钠-乙醇溶液中浸泡8h,室温干燥,静置时间为5h。将相对环氧乙烷摩尔比分别为0.1mol%、0.1mol%的N,N-亚甲基双丙烯酰胺(MBAA)、过硫酸铵(APS)与环氧乙烷(EO)溶液混合,配制环氧乙烷混合溶液。将上述干燥的凝胶浸入环氧乙烷混合溶液中浸泡24h,室温干燥,静置时间为5h,制得PVA / Li + / PEO互穿网状结构复合凝胶电解质。PVA / Li + / PEO互穿网状结构复合凝胶电解质的离子电导率为0.8×10 -4 S / cm,拉伸强度为2.367MPa,断裂伸长率为312.63%。
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Abstract
The invention discloses a preparation method of a PVA / Li<+> / PEO interpenetrating network structure composite gel electrolyte, which comprises the steps of dissolving polyvinyl alcohol PVA in deionizedwater, and carrying out freeze crosslinking; immersing the prepared polyvinyl alcohol PVA into a lithium salt solution, and enabling lithium ions to be fully immersed into a polyvinyl alcohol PVA system; then introducing ethylene oxide EO into the PVA / Li<+> system, and carrying out ring opening polymerization and crosslinking on ethylene oxide to prepare the PVA / Li<+> / PEO interpenetrating networkstructure composite gel electrolyte; and preparing a PVA / Li<+> / PEO interpenetrating network structure composite gel electrolyte membrane, wherein the conductivity and mechanical properties of the PVA / Li<+> / PEO interpenetrating network structure composite gel electrolyte membrane are higher than those of PVA / Li<+> and PEO / Li<+> polymer electrolytes. The preparation method has great application potential in lithium batteries and air batteries.
Description
technical field [0001] 本发明属于电池电解质材料领域,具体涉及一种PVA / Li + / PEO互穿网状结构复合凝胶电解质材料的制备方法。 Background technique [0002] 近些年来,柔性显示器、可穿戴电子设备蓬勃发展,柔性储能越来越成为科研人员的研究热点。柔性显示器、可穿戴电子设备都要求高电化学性能,充电时间短、循环寿命长的电源,与此同时,还要具备便携,轻巧,柔性好等特点。电解液是其中的关键成分之一,其决定了电源的电化学稳定窗口、循环寿命、安全性以及环保性。目前,在商用的电池中,液体电解质是最常用的电解质,因为它们具有较高的离子电导率,且可以与各种电极保持良好稳定的接触。一直以来,液体电解质的安全问题一直困扰着人们的生产与生活。比如渗漏,通常液体电解质具有毒性和易燃性。 [0003] 为了满足储能装置(ESD)安全性、灵活性和多功能性,聚合物电解质应运而生。聚合物电解质由于其较宽的电化学窗口、良好的热稳定性和降低了电解质溶液泄漏的可能性而被认为是替代液体电解质的最佳选择。 [0004] 固体聚合物电解质(SPE)与凝胶聚合物电解质(GPE)相比,GPE在室温下具有更高的离子电导率。在GPE中,液体电解质被固定在聚合物基质中,与隔膜相比,可以降低泄漏的风险。GPE兼具液体和固体成分的优点,电解质同时充当了隔膜的作用,因而受到越来越多的关注。 Contents of the invention [0005] 本发明的目的是提供一种取代传统液体电解质的凝胶电解质,从而解决液体电解质易渗漏,有毒,易燃,需要隔膜的问题。 [0006] In order to solve the above problems, the present invention adopts the following technical solutions: [0007] 一种PVA / Li + / PEO互穿网状结构复合凝胶电解质的制备方法,包括下述步骤: [0008] (1)聚乙烯醇PVA的溶解 [0009] 称取一定量的聚乙烯醇PVA溶于去离子水中并加热搅拌至完全溶解,获得稳定的PVA溶液,PVA溶液的浓度为10~20wt%; [0010] (2)聚乙烯醇PVA的冷冻交联 ...
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