Activating an MXene as a host for EMIm by electrochemistry-driven Fe-ion pre-intercalation

EMIm + , as a substitute for Li + , can solve the initial problems that accompany lithiation/delithiation processes on an anode. However, the larger size of EMIm + limits the options when it comes to electrode materials. Herein, a multilayered Ti 3 C 2 T x MXene was electrochemically pre-intercalated with Fe ions to achieve EMIm + hosting abilities. As a result, a pre-intercalated MXene electrode exhibited enhanced EMIm + transport and storage capabilities. When integrated with an EMIm + [PF6] − ionic liquid electrolyte, the assembled DIB provides an energy density of 76 W h kg −1 at a power density of 360 W kg −1 , and 94.3% of the energy density is retained after 50 cycles. Compared with a pristine example, the Fe pre-intercalated Ti 3 C 2 T x MXene showed a significant increase in electrochemical performance. Employing this approach to optimize layered materials may open up a new route for accurately tuning intercalated materials. An electrochemistry-driven Fe-ion pre-intercalated MXene with superior EMIm + reversible storage abilities for dual-ion battery use was shown.