A Ceramic-Based Separator for High-Temperature Supercapacitors

Currently, supercapacitors have the shortcoming of limited operation temperature mainly owing to the low thermal stability of separators, which seriously hinder their application at high temperatures. In this work, a simple and universal method for the fabrication of high-temperature standing ceramic-based separators is reported. It was demonstrated that such a separator can withstand over 350 °C without any shrinkage. Supercapacitors fabricated by using such separators can be operated at as high as 120 °C efficiently and even after 9000 cycles at 2.5 V operation voltage, their capacitance still retained approximately 88 % of their initial performance. To the best of our knowledge, this is the first report of a separator with such high thermal stability.