High-performance solid-state ceramic supercapacitors based on novel NASICON-ionic liquid composite electrolyte

of specific energy. Supercapacitors exhibited electric double-layer capacitive behaviour at operating potentials ≤2 V. Furthermore, the fabricated devices demonstrated excellent high-temperature operational stability, as evidenced by their reliable operation at 50 °C and 100 °C over 15 thermal cycles. The practical applicability of the fabricated devices is tested by connecting 2 such cells (2 V each) in series, which power a 4 V blue LED for more than 30 minutes.