Hybrid supercapacitors have recently emerged as next-generation energy storage devices that bridge the gap between supercapacitors and lithium-ion batteries. However, developing high energy cathodes that maintain long-term cycle stability and a high rate capability for real applications remains a significantly challenging issue. Herein, we report a facile synthesis method for a laser-scribed graphene/LiNi_1/3Mn_1/3Co_1/3O₂ (LSG/NMC) composite for high energy cathode materials for use in hybrid supercapacitors. LSG/NMC composites exhibit not only a high capacitance of up to 141.5 F/g but also an excellent capacitance retention of 98.1% after 1000 cycles at a high current density of 5.0 A/g. The introduction of an NMC spacer between the LSG layers provides an enlarged interspace that can act as an efficient channel for additional storage sites and rapid access. In addition, we further confirmed that hybrid supercapacitors using LSG/NMC cathodes and H₂T₁₂O₂₅ anodes with an AlPO₄/carbon hybrid coating layer (H-HTO) deliver a remarkable energy density of ~123.5 Wh/kg, power density of ~14074.8 W/kg, and a long-term cycle stability of 94.6% after 20,000 cycles. This work demonstrates that our proposed material can be considered a strong cathode candidate for next-generation hybrid supercapacitors.

混合超级电容器最近已成为下一代能量存储设备，弥合了超级电容器和锂离子电池之间的差距。然而，为实际应用开发保持长期循环稳定性和高倍率能力的高能阴极仍然是一个极具挑战性的问题。在此，我们报道了一种激光划线的石墨烯/ LiNi _1/3 Mn _1/3 Co _1/3 O ₂的简便合成方法（LSG / NMC）复合材料，用于混合超级电容器中使用的高能阴极材料。LSG / NMC复合材料不仅具有高达141.5 F / g的高电容，而且在5.0 A / g的高电流密度下经过1000次循环后仍具有98.1％的出色电容保持率。在LSG层之间引入NMC隔离层可提供更大的空间，可以用作其他存储位置和快速访问的有效通道。此外，我们进一步证实了使用LSG / NMC阴极和H ₂ T ₁₂ O ₂₅阳极以及AlPO _4的混合超级电容器碳/碳杂化涂层（H-HTO）的能量密度约为123.5 Wh / kg，功率密度约为14074.8 W / kg，在20,000个循环后的长期循环稳定性为94.6％。这项工作表明，我们提出的材料可以被认为是下一代混合超级电容器的理想阴极材料。