Oak-Mushroom-Derived Activated Carbon for High-Performance Lithium-Ion Capacitors

Lithium-ion capacitors (LICs) are considered promising next-generation energy storage devices that combine the high energy density of lithium-ion batteries with the high power density of supercapacitors.However, their performance is often constrained by the limited ionaccessible surface area and sluggish charge transfer of conventional carbon electrodes.In this study, a high-performance LIC was developed using activated carbon derived from oak mushrooms (OM) as the cathode and lithium titanate (LTO) as the anode.The OM-derived activated carbon, synthesized through KOH activation, exhibited a hierarchical porous structure with a large specific surface area of 2206.4 m 2 g -1 and an average pore volume of 0.9146 cm 3 g -1 , facilitating efficient ion adsorption/desorption and rapid charge transport.Consequently, the OM//LTO full cell demonstrated outstanding electrochemical performance, maintaining 99% of its initial capacity after 700 cycles and delivering energy and power densities of 113 Wh kg -1 and 14,000 W kg -1 , respectively.This work highlights the potential of sustainable, mushroom-derived activated carbon as an eco-friendly and efficient electrode material for advanced LICs, offering a practical pathway to enhance the balance between energy and power output.