화학공학소재연구정보센터
Journal of Power Sources, Vol.353, 85-94, 2017
High performance sodium-ion hybrid capacitor based on Na2Ti2O4(OH)(2) nanostructures
Hybrid Na-ion capacitors bridge the performance gap between Na-ion batteries and supercapacitors and offer excellent energy and power characteristics. However, designing efficient anode and cathode materials with improved kinetics and long cycle life is essential for practical implementation of this technology. Herein, layered sodium titanium oxide hydroxide, Na2Ti2O4(OH)(2), synthesized through hydrothermal technique, is studied as efficient anode material for hybrid Na-ion capacitor. Half-cell electrochemical studies vs. Na/Na+ showed excellent performance for Na2Ti2O4(OH)(2)electrode, with similar to 57.2% of the total capacity (323.3 C g(-1) at 1.0 mV s(-1)) dominated by capacitive behavior and the remaining due to Na-intercalation. The obtained values are in good agreement with Trasatti plots indicating the potential of this material as efficient anode for hybrid Na-ion capacitor. Further, a full cell Na-ion capacitor is fabricated with Na2Ti2O4(OH)(2) as anode and chemically activated Rice Husk Derived Porous Carbon (RHDPC-KOH) as cathode by using organic electrolyte. The hybrid device, operated at a maximum cell voltage of 4 V, exhibits stable electrochemical performance with a maximum energy density of similar to 65 Wh kg(-1) (at 500 W kg(-1), 0.20 A g(-1)) and with more than similar to 93% capacitive retention after 3000 cycles. (C) 2017 Elsevier B.V. All rights reserved.