To meet the increasing demands for high-performance energy storage devices, an advanced lithium-ion hybrid capacitor (LIHC) has been designed and fabricated, which delivers an ultrahigh energy density of 295.1 Wh kg and a power density of 41 250 W kg with superior cycling stability. The high-performance LIHC device is based on the uniform porous Nb N /rGO nanocomposite, which has an intimate interface between the firmly contacted Nb N and rGO through the Nb(Nb N )-O(rGO)-C(rGO) bonds, significantly improving the electron transport kinetics. Moreover, the introduction of rGO nanosheets can prevent the Nb N nanoparticles from agglomeration, not only resulting in a larger specific surface area to provide more active sites but also accommodating the strain during Li ion insertion/deinsertion. Therefore, the Nb N /rGO nanocomposite exhibits a higher reversible specific capacity and better rate and cycling performance than the Nb N nanoparticle. In view of the scalable preparation and superior electrochemical characteristics, the Nb N /rGO nanocomposite would have great potential practical applications in the future energy storage devices.