Abstract
Polymer electrolytes composed of poly(ethylene oxide) (PEO), lithium oxalate (LiOX), and borontrifluoride diethyl ether (BF3·OEt2) were prepared, and their ionic conductivities, lithium ion transference number, thermal properties, and infrared spectra were investigated. The polymer electrolyte for the PEO/LiOX in the absence of BF3·OEt2 showed the ionic conductivity of 10–6 S cm−1 at 130 °C. The addition of BF3·OEt2 into the polymer electrolyte for the PEO/LiOX system induced an increase of the ionic conductivities by three orders of magnitude. IR spectra showed that in the polymer electrolyte for the PEO/LiOX system in the presence of BF3·OEt2, new interactions between LiOX and BF3·OEt2 and also between LiOX and PEO were observed. The polymer electrolyte for the PEO/LiOX system in the presence of BF3·OEt2 showed the lithium ion transference number of 0.55, which is higher than that (0.19) of PEO/LiTFSI polymer electrolyte. It was found that usage of the carboxyl discrete lithium salt for the polymer electrolyte is a promising method to improve lithium transference number.
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