Design of Graphene-Based Electrode Materials Incorporating Spinel Oxide for Lithium-Ion Capacitors

초록

Graphene-based composite electrode incorporating spinel lithium titanate oxide (G/LTO) was designed to enhance the electrochemical performance of lithium-ion capacitors (LICs). The G/LTO material was synthesized following freeze-drying and plasma treatment to form porous three-dimensional structures. The mixing ratio of G and LTO was optimized to achieve a high specific capacity of 72.5 mAh g?1 at high C-rates in a half-cell configuration. In the full-cell LIC device, the electrode exhibited a specific capacitance of 35.9 F g?1 with excellent cycling stability, attributed to the synergistic integration of a highly conductive graphene framework and the spinel-structured LTO, which providing efficient lithium-ion diffusion pathways. This work presents a promising strategy for developing advanced LIC anode materials with high capacity and long-term stability. - 본 연구는 2025년도 산업통상자원부 및 산업기술기획평가원(KEIT) 연구비 지원에 의한 연구임(RS-2022-00156073). Keywords: LIC, graphene, spinel lithium titanate oxide, plasma treatment, freeze-drying