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

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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.

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