Abstract
In this paper, the single ionic conductor SiO2(Li+) was first synthesized from Tetraethylorthosilicate and γ-(2,3-epoxypropoxy) propyltrimethoxysilane (KH560) by sol–gel hydrolysis and then neutralized by lithium hydroxide in methanol. The poly(vinylidene fluoride) based composite microporous gel polymer electrolytes (CMGPEs) doped with SiO2(Li+) was prepared by phase inversion method and the desirable CMGPEs was obtained after being activated in liquid electrolyte. The physicochemical properties of the CMGPEs were characterized by FT-IR, DSC, XRD, TG, stress–strain response and electrochemical measurements. It was found that with the addition of SiO2(Li+), the degree of crystallization of microporous polymer membrane was decreased while its porosity increased, which could promote the absorption and gelation of liquid electrolyte. In addition, due to vast amount of Li+ ions in the SiO2(Li+), it would promote ionic conductivity at room temperature for the CMGPEs. When the content of SiO2(Li+) reached 5 %wt, the ionic conductivity of the CMGPEs could reach 10−2S/cm order of magnitude at room temperature and the reciprocal temperature dependence of ionic conductivity of as-prepared CMGPEs follow arrhenius equation, in addition, its electrochemical stability window could reach 5.2 V.
Highlights
Many types of ionic conducting polymers, generally classified as polymer electrolytes, have been developed and characterized in recent years
The poly(vinylidene fluoride) based composite microporous gel polymer electrolytes (CMGPEs) doped with SiO2(Li?) was prepared by phase inversion method and the desirable CMGPEs was obtained after being activated in liquid electrolyte
A proper amount of poly(vinylidene fluoride) (PVDF) was first dissolved in the solvent (N,N-dimethylformamide, DMF), it was stirred for about 18 h at room temperature
Summary
Many types of ionic conducting polymers, generally classified as polymer electrolytes, have been developed and characterized in recent years. Polyacrylonitrile (PAN) [1], poly(vinylidene fluoride) (PVDF) [2,3,4], poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF–HFP) [5, 6] and poly(methyl methacrylate) (PMMA) [7,8,9] are the most common host polymers used for preparing gel electrolytes Ceramic fillers such as SiO2 [10], Al2O3 [11], TiO2 [12] and BaTiO3 [13] have been incorporated along with the host polymer in order to obtain composite polymer electrolytes with improved electrical and mechanical properties. By suitable surface modification of the ceramic particles, they can act as the source of charge [14, 15] These considerations motivated us to modify the polymer matrix by introducing inorganic materials containing dissociative lithium ions. The white powder SiO2(Li?) can be obtained after being dried under vacuum at 100 °C for 24 h
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