Abstract
To improve the ionic conductivity and thermal stability of a polyethylene oxide (PEO)-ethylene carbonate (EC)-LiClO4-based solid polymer electrolyte for lithium-ion batteries, polymethyl methacrylate (PMMA) and silica aerogel were incorporated into the PEO matrix. The effects of the PEO:PMMA molar ratio and the amount of silica aerogel on the structure of the PEO-PMMA-LiClO4 solid polymer electrolyte were studied by X-ray diffraction, Fourier-transform infrared spectroscopy and alternating current (AC) impedance measurements. The solid polymer electrolyte with PEO:PMMA = 8:1 and 8 wt% silica aerogel exhibited the highest lithium-ion conductivity (1.35 × 10−4 S∙cm−1 at 30 °C) and good mechanical stability. The enhanced amorphous character and high degree of dissociation of the LiClO4 salt were responsible for the high lithium-ion conductivity observed. Silica aerogels with a high specific surface area and mesoporosity could thus play an important role in the development of solid polymer electrolytes with improved structure and stability.
Highlights
The constant development and widespread use of mobile devices are leading to increasing demand for secondary batteries for electrical energy storage
SP4samples, samples, corresponding consisting of 4 and ethylene carbonate (EC), or polyethylene oxide (PEO), polymethyl methacrylate (PMMA), LiClO4, and EC. This indicates that the SP1, SP2, consisting of PEO, LiClO4 and EC, or PEO, PMMA, LiClO4, and EC
SP1, which suggests that PMMA blending and incorporation of silica aerogel powder effectively allows the acquisition of thermally and mechanically stable solid electrolytes [41]
Summary
The constant development and widespread use of mobile devices are leading to increasing demand for secondary batteries for electrical energy storage. With the rapid growth in the smartphone market and the development of electric vehicles, the need for secondary batteries will continue to increase [1]. Current lithium-ion secondary batteries use a liquid electrolyte, whose leakage may cause fire and explosions, raising safety issues [2,3]. As a possible solution to this problem, all-solid-state lithium-ion batteries are being developed using a polymer or ceramic-based solid electrolyte [4,5]. Among various solid electrolyte materials, solid polymers have been actively studied, owing to their good flexibility and interfacial stability [7]
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