A Practical High‐Performance Lithium‐Ion Capacitor Fabricated with Dual Graphene‐Based Electrode Materials

Abstract Lithium‐ion capacitors (LICs) hold great promise by merging the benefits of lithium‐ion batteries and supercapacitors. However, their performance is frequently constrained by a disparity in the kinetic properties of the cathode and anode. This study introduces a dual graphene‐based approach aimed at improving the efficiency and functionality of LICs and demonstrates the successful large‐scale production of graphene (SHSG) using a self‐propagating high‐temperature synthesis method. In the cathode, SHSG forms a continuous graphene network, reducing interfacial resistance, enhancing conductivity and achieving a capacity of 85.9 mAh g −1 . In the anode, SHSG improves ion diffusion and reaction interfaces, increasing capacity from 247.9 to 286.6 mAh g −1 . A full LIC cell assembled with 10% SHSG in both electrodes demonstrates a peak energy density of 106.3 Wh kg −1 and retains 33 Wh kg −1 at 4.4 kW kg −1 , which is calculated based on the total mass of the electrodes. Additionally, a 1100 F LIC pouch cell is developed, showcasing its potential for practical energy storage. This work underscores the transformative role of graphene in optimizing LICs and advancing energy storage technologies.