Fabrication of PEO-PMMA-LiClO4-Based Solid Polymer Electrolytes Containing Silica Aerogel Particles for All-Solid-State Lithium Batteries

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.

The synergistic effect of the PEO–PVA–PESf composite polymer electrolyte for all-solid-state lithium-ion batteries

“…[5][6][7][8][9] However, the low room temperature conductivity (10 À7 to 10 À6 S cm À1 ), narrow electrochemical windows and inferior mechanical properties of PEO are the main obstacles for further development. 4,7,9 Blending is one of the valid approaches to ameliorate the properties of PEO, such as with PVP, 10 PVDF, 11 and PMMA; 12 this can decrease crystallization and enhance the fractional movement of polymer chains and the migration amount of Li + . 13 Similar to PEO, polyvinyl alcohol (PVA) is another semicrystalline polymer with the fascinating properties of nontoxic, water solubility and biocompatibility; it has been under the spotlight and applied as an electrolyte in supercapacitors on a large scale.…”

Investigation of Lithium Transference Number in PMMA Composite Polymer Electrolytes Using Monte Carlo (MC) Simulation and Recurrence Relation

“…Lastly, it is shown that the addition of inorganic particle into the polymer matrix greatly enhances the ionic conductivity and lithium transference number of traditional electrolytes system. CPEs not only has a greater ionic conductivity and lithium transference number than traditional polymer electrolytes system, but several recent studies also show that CPEs exhibit better thermal stability and energy density [16,32].…”

“…Qian et al [8] reported an improvement in ionic conductivity from 1.30×10 -7 S/cm for (PEO) 16 LiClO 4 to 2.36×10 -4 S/cm at room temperature when 50 wt% Ethylene Carbonate (EC) was incorporated into the mixture. The addition of plasticizers lowers the glass transition temperature, T g of the mixture, and this decreases the degree of crystallinity of polymer electrolytes at room temperature.…”

“…Furthermore, PMMA as a semi-crystalline polymer is selected as the polymer host because of its higher ionic conductivity and lithium transference number at room temperature compared to traditional PEO based system that are suffering from low ionic conductivity and transference number at room temperature due to their high degree of crystallinity [13,14]. Several studies also show that PMMA based polymer electrolytes have the potential to be fabricated into solid electrolytes used in solid-state batteries and solid-state supercapacitors [15][16][17].…”

Recent advances in the interface design of solid-state electrolytes for solid-state energy storage devices

“…13a). To improve the ionic conductivity and thermal stability of a polyethylene oxide-type SSE for LIBs, Lim et al109 incorporated poly (methyl methacrylate) into polyethylene oxide matrix. The…”