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.