A Supercapacitor Driven by MXene Nanofluid Gel Electrolyte Induced the Synergistic High Ionic Migration Rate and Excellent Mechanical Properties

Abstract The current application of gel electrolytes in energy storage fails to meet the demand for higher ion transport and excellent mechanical properties due to the low ionic conductivity and poor mechanical properties. Herein, a novel strategy is proposed to graft oligomer polyetheramine on the surface of MXene to achieve a transformation from solid MXene to MXene nanofluid avoiding oxidation and aggregation of MXene, and then it is introduced to gel electrolytes providing ion transport channels and mechanical properties. The synergistic effect on the core of MXene and the canopy of polyetheramine produce Lewis acid–base interactions on electrolyte ions, which not only promote electrolyte dissociation but also provides ion transport path‐way. The experiment and molecular dynamics simulations show that the ionic diffusion ability of electrolyte ions is enhanced, because the MXene and polyetheramine promote electrolyte dissociation and reduce the electrostatic interference between anions and cations. The specific capacity of the assembled supercapacitor is 114.28 F g⁻¹ at 1 A g⁻¹ current density, and the capacity retention rate is 91.30% after 3000 cycles. This work provides a new insight for fabricating high‐performance devices.