Department of Chemistry, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia.
ChemSusChem. 2013 Aug;6(8):1400-5. doi: 10.1002/cssc.201300296. Epub 2013 Jun 11.
A solid polymer electrolyte prepared by using a solvent-free, scalable technique is reported. The membrane is formed by low-energy ball milling followed by hot-pressing of dry powdered polyethylene oxide polymer, LiCF3 SO3 salt, and silane-treated Al2 O3 (Al2 O3 -ST) ceramic filler. The effects of the ceramic fillers on the properties of the ionically conducting solid electrolyte membrane are characterized by using electrochemical impedance spectroscopy, XRD, differential scanning calorimeter, SEM, and galvanostatic cycling in lithium cells with a LiFePO4 cathode. We demonstrate that the membrane containing Al2 O3 -ST ceramic filler performs well in terms of ionic conductivity, thermal properties, and lithium transference number. Furthermore, we show that the lithium cells, which use the new electrolyte together with the LiFePO4 electrode, operate within 65 and 90 °C with high efficiency and long cycle life. Hence, the Al2 O3 -ST ceramic can be efficiently used as a ceramic filler to enhance the performance of solid polymer electrolytes in lithium batteries.
一种无溶剂、可扩展技术制备的固体聚合物电解质。该膜是通过低能量球磨，然后对干燥的粉末状聚环氧乙烷聚合物、LiCF3SO3盐和硅烷处理的 Al2O3（Al2O3-ST）陶瓷填料进行热压成型而形成的。采用电化学阻抗谱、XRD、差示扫描量热法、SEM 和恒电流循环对锂离子电池中的离子导电固体电解质膜的性能进行了表征，该电池采用 LiFePO4作为阴极。结果表明，含有 Al2O3-ST 陶瓷填料的膜在离子电导率、热性能和锂离子迁移数方面表现良好。此外，我们还表明，使用新型电解质和 LiFePO4电极的锂电池在 65 和 90°C 下高效、长循环寿命运行。因此，Al2O3-ST 陶瓷可用作陶瓷填料，以提高锂电池中固体聚合物电解质的性能。
