Ti3C2Tx–Nb2Mo3O14 Composite as Novel Anode to Realize High Power Density Combined with High Stability in a Hybrid Lithium-Ion Capacitor

Abstract

Lithium-ion capacitors (LICs), with their higher energy density at high power capability, stand out as the future generation of energy-storage devices. Herein, the nanocomposite of Ti3C2Tx MXene with Nb2Mo3O14 is prepared by a one-step hydrothermal method and studied as an electrode material for LIC. The as-fabricated composite MXene niobium molybdenum oxide (MXNMO) achieves a high reversible capacity of 205 mAh g−1 at 100 mA g−1 current density with outstanding cyclability. Further, asymmetric LIC full-cell device composed of MXNMO anode with supercapacitor grade activated carbon as a cathode delivers an energy density of 37.8 Wh kg−1 (0.25 A g−1) and a higher power density of 4244 W kg−1 (5 A g−1) along with the excellent durability showing 85% capacitance retention over 4000 cycles at 0.5 A g−1.